WPF+MVVM入门学习

最近在学WPF的MVVM，有两种方式实现，一种是自己实现，一种是借助MVVM框架，接下来通过一个医院自助打印报告机键盘输入界面来演示自己实现、框架CommunityToolkit和Prism的区别。
项目源码：https://gitee.com/cplmlm/SelfServiceReportPrinter
https://github.com/cplmlm/SelfServiceReportPrinter
推荐学习博主：B站UP十月的寒流
一、自己实现

1、首先我们创建一个BaseNotifyPropertyChanged类，继承INotifyPropertyChanged，这个方法的作用是属性值变化时自动更新UI界面。

1. public class BaseNotifyPropertyChanged : INotifyPropertyChanged
2. {
3. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
4. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
5. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
6. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
7. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
8. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
9. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public event PropertyChangedEventHandler? PropertyChanged;
10. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public void RaisePropertyChanged(string propertyName)
17. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
18. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
19. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
20. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
21. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
22. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
23. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
24. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
25. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
26. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
27. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
28. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
29. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
30. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
31. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
32. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
33. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
34. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
35. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
36. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> if (!string.IsNullOrEmpty(propertyName))
37. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
50. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
51. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
52. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
53. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
54. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
55. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
56. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
57. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
58. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
59. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
60. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
61. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
62. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
63. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
64. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
65. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
66. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
67. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
68. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
69. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
70. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
71. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
72. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
73. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
74. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
75. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
76. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
77. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
78. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
79. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
80. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
81. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
82. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
89. }

复制代码

2、创建一个KeyPressViewModel类，继承BaseNotifyPropertyChanged。

1. public class KeyPressViewModel : BaseNotifyPropertyChanged
2. {
3. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
4. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
5. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
6. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
7. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
8. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
9. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private string cardNumber;
10. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private int selectionStart=0;
18. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
19. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
20. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
21. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
22. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
23. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
24. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
25. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 输入文本框的值
32. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
33. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
34. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
35. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
36. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
37. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
38. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
39. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
40. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
41. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
42. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
43. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
44. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
45. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public string CardNumber
46. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
53. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
54. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
55. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
56. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
57. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
58. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
59. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
60. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
61. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
62. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
63. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
64. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
65. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> get { return cardNumber; }
66. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
67. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
68. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
69. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
70. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
71. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
72. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
73. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
74. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
75. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
76. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
77. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
78. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> set
79. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
92. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
93. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
94. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
95. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
96. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
97. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
98. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
99. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
100. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
101. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
102. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
103. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
104. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
105. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
106. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
107. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
108. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
109. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
110. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> cardNumber = value;
111. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
112. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
113. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
114. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
115. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
116. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
117. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
118. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
119. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
120. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
121. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
122. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
123. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
124. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
125. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
126. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
127. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
128. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
129. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> RaisePropertyChanged(nameof(CardNumber));
130. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
131. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
132. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
133. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
134. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
135. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
136. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
137. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
138. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
139. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
140. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
141. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
142. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
143. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
144. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
145. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
146. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
147. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
148. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
149. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
151. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
152. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
153. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
154. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
155. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
156. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
157. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
158. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
159. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
160. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
161. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
162. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
163. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
164. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 输入框光标位置
165. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
166. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
167. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
168. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
169. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
170. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
171. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
172. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
173. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
174. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
175. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
176. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
177. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
178. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public int SelectionStart
179. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
180. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
181. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
182. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
183. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
184. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
185. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
186. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
187. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
188. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
189. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
190. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
191. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
192. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
193. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
194. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
195. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
196. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
197. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
198. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> get { return selectionStart; }
199. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
200. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
201. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
202. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
203. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
204. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
205. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
206. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
207. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
208. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
209. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
210. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
211. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> set { RaisePropertyChanged(nameof(SelectionStart)); }
212. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
213. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
214. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
215. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
216. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
217. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
218. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
220. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
221. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
222. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
223. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
224. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
225. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
226. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
227. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
228. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
229. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
230. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
231. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
232. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
233. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 数字按钮绑定事件
234. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
235. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
236. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
237. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
238. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
239. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
240. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
241. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
242. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
243. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
244. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
245. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
246. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
247. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public ICommand NumberCommand
248. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
249. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
250. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
251. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
252. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
253. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
254. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
255. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
256. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
257. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
258. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
259. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
260. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
261. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
262. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
263. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
264. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
265. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
266. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
267. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> get { return new RelayCommand<string>(Number); }
268. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
269. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
270. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
271. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
272. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
273. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
274. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
276. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
277. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
278. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
279. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
280. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
281. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
282. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
283. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
284. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
285. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
286. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
287. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
288. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
289. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 清空按钮绑定事件
290. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
291. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
292. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
293. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
294. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
295. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
296. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
297. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
298. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
299. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
300. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
301. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
302. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
303. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public ICommand ClearCommand
304. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
305. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
306. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
307. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
308. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
309. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
310. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
311. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
312. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
313. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
314. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
315. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
316. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
317. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
318. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
319. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
320. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
321. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
322. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
323. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> get { return new RelayCommand(Clear); }
324. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
325. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
326. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
327. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
328. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
329. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
330. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
332. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
333. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
334. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
335. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
336. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
337. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
338. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
339. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
340. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
341. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
342. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
343. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
344. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
345. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 删除按钮绑定事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
346. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
347. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
348. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
349. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
350. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
351. <Button  Content="清空"  Command="{Binding ClearCommand}"   />
352. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
353. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
354. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
355. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
356. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
357. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
358. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
360. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
361. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
362. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
363. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
364. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
365. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
366. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public ICommand DeleteCommand
367. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
368. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
369. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
370. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
371. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
372. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
373. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
374. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
375. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
376. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
377. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
378. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
379. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
380. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
381. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
382. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
383. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
384. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
385. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
386. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> get { return new RelayCommand(Delete); }
387. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
388. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
389. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
390. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
391. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
392. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
393. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
395. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
396. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
397. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
398. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
399. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
400. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
401. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
402. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
403. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
404. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
405. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
406. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
407. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
408. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 数字点击事件
409. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
410. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
411. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
412. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
413. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
414. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
415. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
416. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
417. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
418. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
419. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
420. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
421. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
422. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <param name="key"></param>
423. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
424. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
425. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
426. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
427. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
428. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
429. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Number(string? key)
430. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
431. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
432. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
433. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
434. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
435. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
436. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
437. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
438. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
439. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
440. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
441. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
442. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
443. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
444. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
445. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
446. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
447. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
448. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
449. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> CardNumber += key;
450. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
451. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
452. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
453. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
454. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
455. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
456. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
458. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
459. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
460. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
461. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
462. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
463. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
464. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
465. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
466. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
467. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
468. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
469. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
470. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
471. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 清空点击事件
472. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
473. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
474. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
475. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
476. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
477. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
478. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
479. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
480. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
481. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
482. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
483. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
484. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
485. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Clear()
486. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
487. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
488. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
489. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
490. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
491. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
492. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
493. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
494. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
495. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
496. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
497. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
498. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
499. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
500. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
501. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
502. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
503. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
504. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
505. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> CardNumber = string.Empty;
506. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
507. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
508. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
509. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
510. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
511. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
512. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
513. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
514. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
515. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
516. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
517. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
518. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
519. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// <summary>
520. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
521. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
522. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
523. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
524. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
525. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
526. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 删除点击事件
527. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
528. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
529. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
530. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
531. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
532. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
533. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// </summary>
534. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
535. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
536. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
537. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
538. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
539. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
540. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Delete()
541. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
542. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
543. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
544. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
545. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
546. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
547. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
548. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
549. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
550. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
551. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
552. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
553. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
554. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
555. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
556. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
557. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
558. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
559. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
560. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> // 光标在输入框时，删除光标前一个字符
561. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
562. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
563. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
564. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
565. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
566. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
567. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
568. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
569. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
570. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
571. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
572. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
573. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> if (!string.IsNullOrEmpty(CardNumber) && SelectionStart > 0)
574. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
575. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
576. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
577. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
578. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
579. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
580. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
581. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
582. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
583. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
584. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
585. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
586. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
587. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
588. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
589. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
590. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
591. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
592. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
593. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
594. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
595. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
596. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
597. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
598. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
599. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
600. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
601. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
602. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
603. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
604. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
605. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> CardNumber = CardNumber.Remove(SelectionStart - 1, 1);
606. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
607. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
608. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
609. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
610. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
611. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
612. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
613. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
614. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
615. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
616. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
617. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
618. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
619. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
620. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
621. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
622. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
623. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
624. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
625. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
626. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
627. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
628. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
629. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
630. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
631. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> //光标没有在输入框时，删除最后一个字符
632. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
633. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
634. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
635. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
636. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
637. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
638. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
639. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
640. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
641. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
642. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
643. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
644. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> if (SelectionStart == 0)
645. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
646. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
647. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
648. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
649. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
650. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
651. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
652. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
653. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
654. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
655. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
656. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
657. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {
658. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
659. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
660. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
661. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
662. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
663. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
664. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
665. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
666. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
667. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
668. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
669. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
670. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
671. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
672. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
673. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
674. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
675. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
676. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> CardNumber = CardNumber.Remove(CardNumber.Length - 1, 1);
677. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
678. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
679. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
680. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
681. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
682. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
683. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
684. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
685. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
686. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
687. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
688. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
689. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
690. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
691. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
692. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
693. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
694. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
695. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
696. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> }
697. }

复制代码

3、创建RelayCommand类，这个类的作用是绑定事件的操作，一个泛型版本，一个是非泛型。

1. public class RelayCommand : ICommand
2. {
4. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private Action _execute;
11. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
12. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
13. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
14. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
15. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
16. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
17. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private Func<bool> _canExecute;
20. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
21. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
22. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
23. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
24. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
25. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
26. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public RelayCommand(Action execute) : this(execute, null)
27. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
28. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
29. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
30. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
31. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
32. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
33. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
34. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
42. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
43. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
44. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
45. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
46. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
47. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
48. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public RelayCommand(Action execute, Func<bool> canExecute)
49. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
53. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
54. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
55. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
56. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
57. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
58. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
59. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
60. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
61. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
62. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
63. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
64. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
65. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
66. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
67. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
68. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (execute == null)
69. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
70. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
71. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
72. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
73. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
74. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
75. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
76. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
77. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
78. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
79. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
80. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
81. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
82. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
83. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
84. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
85. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
86. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
87. <Button  Content="清空"  Command="{Binding ClearCommand}"   />throw new ArgumentNullException("execute");
88. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
92. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
93. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
94. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
95. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
96. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
97. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
98. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
99. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
100. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_execute = execute;
101. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
102. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
103. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
104. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
105. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
106. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
107. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
108. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
109. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
110. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
111. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
112. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
113. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_canExecute = canExecute;
114. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
115. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
116. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
117. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
118. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
119. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
120. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
122. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
123. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
124. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
125. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
126. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
127. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
128. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public event EventHandler? CanExecuteChanged
129. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
130. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
131. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
132. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
133. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
134. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
135. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
136. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
137. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
138. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
139. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
140. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
141. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
142. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
143. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
144. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
145. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
146. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
147. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
148. <Button  Content="清空"  Command="{Binding ClearCommand}"   />add
149. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
150. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
151. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
152. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
153. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
154. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
155. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
156. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
157. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
158. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
159. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
160. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
161. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
162. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
163. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
164. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
165. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
166. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
167. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
168. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
169. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
170. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
171. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
172. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
173. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
174. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
175. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
176. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
177. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
178. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
179. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
180. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (_canExecute != null)
181. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
182. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
183. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
184. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
185. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
186. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
187. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
188. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
189. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
190. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
191. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
192. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
193. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
194. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
195. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
196. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
197. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
198. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
199. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
200. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
201. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
202. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
203. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
204. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
205. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
206. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
207. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
208. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
209. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
210. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
211. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
212. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
213. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
214. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
215. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
216. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
217. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
218. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
219. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
220. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
221. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
222. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
223. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
224. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CommandManager.RequerySuggested += value;
225. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
226. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
227. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
228. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
229. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
230. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
231. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
232. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
233. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
234. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
235. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
236. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
237. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
238. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
239. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
240. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
241. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
242. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
243. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
244. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
245. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
246. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
247. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
248. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
249. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
250. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
251. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
252. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
253. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
254. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
255. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
256. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
257. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
258. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
259. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
260. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
261. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
262. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
263. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
264. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
265. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
266. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
267. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
268. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
269. <Button  Content="清空"  Command="{Binding ClearCommand}"   />remove
270. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
271. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
272. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
273. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
274. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
275. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
276. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
277. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
278. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
279. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
280. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
281. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
282. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
283. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
284. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
285. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
286. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
287. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
288. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
289. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
290. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
291. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
292. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
293. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
294. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
295. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
296. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
297. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
298. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
299. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
300. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
301. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (_canExecute != null)
302. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
303. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
304. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
305. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
306. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
307. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
308. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
309. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
310. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
311. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
312. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
313. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
314. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
315. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
316. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
317. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
318. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
319. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
320. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
321. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
322. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
323. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
324. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
325. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
326. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
327. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
328. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
329. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
330. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
331. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
332. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
333. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
334. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
335. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
336. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
337. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
338. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
339. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
340. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
341. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
342. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
343. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
344. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
345. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CommandManager.RequerySuggested -= value;
346. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
347. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
348. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
349. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
350. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
351. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
352. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
353. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
354. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
355. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
356. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
357. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
358. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
359. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
360. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
361. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
362. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
363. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
364. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
365. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
366. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
367. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
368. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
369. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
370. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
371. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
372. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
373. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
374. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
375. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
376. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
377. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
378. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
379. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
380. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
381. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
382. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
383. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
384. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
386. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
387. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
388. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
389. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
390. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
391. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
392. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public bool CanExecute(object parameter)
393. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
394. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
395. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
396. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
397. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
398. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
399. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
400. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
401. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
402. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
403. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
404. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
405. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
406. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
407. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
408. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
409. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
410. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
411. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
412. <Button  Content="清空"  Command="{Binding ClearCommand}"   />return _canExecute == null ? true : _canExecute();
413. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
414. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
415. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
416. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
417. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
418. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
419. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
421. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
422. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
423. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
424. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
425. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
426. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
427. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public void Execute(object parameter)
428. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
429. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
430. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
431. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
432. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
433. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
434. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
435. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
436. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
437. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
438. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
439. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
440. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
441. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
442. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
443. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
444. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
445. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
446. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
447. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_execute();
448. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
449. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
450. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
451. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
452. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
453. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
454. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
455. }

复制代码

1. public class RelayCommand<T> : ICommand
2. {
3. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
4. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
5. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
6. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
7. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
8. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
9. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private readonly Predicate<T> _canExecute;
10. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private readonly Action<T> _execute;
18. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
19. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
20. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
21. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
22. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
23. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
24. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public RelayCommand(Action<T> execute) : this(execute, null)
25. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
32. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
33. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
34. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
35. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
36. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
37. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
38. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
40. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public RelayCommand(Action<T> execute, Predicate<T> canExecute)
47. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
48. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
49. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
50. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
51. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
52. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
53. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
54. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
55. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
56. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
57. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
58. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
59. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
60. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
61. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
62. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
63. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
64. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
65. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
66. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (execute == null)
67. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
68. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
69. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
70. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
71. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
72. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
73. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
74. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
75. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
76. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
77. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
78. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
79. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   />throw new ArgumentNullException("execute");
86. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
87. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
88. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
89. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
90. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
91. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
92. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
93. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
94. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
95. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
96. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
97. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
98. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_execute = execute;
99. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
100. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
101. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
102. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
103. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
104. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
105. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
106. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
107. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
108. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
109. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
110. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
111. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_canExecute = canExecute;
112. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
113. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
114. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
115. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
116. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
117. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
118. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
120. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
121. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
122. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
123. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
124. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
125. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
126. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public event EventHandler? CanExecuteChanged
127. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
128. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
129. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
130. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
131. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
132. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
133. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
134. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
135. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
136. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
137. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
138. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
139. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
140. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
141. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
142. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
143. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
144. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
145. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
146. <Button  Content="清空"  Command="{Binding ClearCommand}"   />add { CommandManager.RequerySuggested += value; }
147. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
148. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
149. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
150. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
151. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
152. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
153. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
154. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
155. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
156. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
157. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
158. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
159. <Button  Content="清空"  Command="{Binding ClearCommand}"   />remove { CommandManager.RequerySuggested -= value; }
160. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
161. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
162. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
163. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
164. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
165. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
166. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
168. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
169. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
170. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
171. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
172. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
173. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
174. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public bool CanExecute(object parameter)
175. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
176. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
177. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
178. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
179. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
180. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
181. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
182. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
183. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
184. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
185. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
186. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
187. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
188. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
189. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
190. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
191. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
192. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
193. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
194. <Button  Content="清空"  Command="{Binding ClearCommand}"   />return _canExecute == null ? true : _canExecute((T)parameter);
195. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
196. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
197. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
198. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
199. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
200. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
201. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
203. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
204. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
205. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
206. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
207. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
208. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
209. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public void Execute(object parameter)
210. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
211. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
212. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
213. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
214. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
215. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
216. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{
217. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
218. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
219. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
220. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
221. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
222. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
223. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
224. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
225. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
226. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
227. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
228. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
229. <Button  Content="清空"  Command="{Binding ClearCommand}"   />_execute((T)parameter);
230. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
231. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
232. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
233. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
234. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
235. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
236. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}
237. }

复制代码

4、通过binding绑定输入框的值和事件的操作，代替传统直接在后台cs文件写事件。

1. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   />

复制代码

5、将MainWindow的DataContext赋值给ViewModel，我这里用了依赖注入的方法，所以直接是在app.cs里面赋值的，也可以在MainWindow.cs。

1. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public partial class App : Application<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public App()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
32. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
33. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
34. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   />Services = ConfigureServices();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
53. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
54. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
55. <Button  Content="清空"  Command="{Binding ClearCommand}"   />this.InitializeComponent();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
56. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
57. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
58. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
59. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
60. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
61. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
62. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
63. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
64. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
65. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
66. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
67. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
68. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
69. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
70. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
71. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
72. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
73. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
74. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
75. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
76. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
77. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
78. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
79. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// Gets the current<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   />instance in use<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
92. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
93. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
94. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
95. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
96. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
97. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
98. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
99. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
100. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
101. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
102. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
103. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public new static App Current => (App)Application.Current;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
104. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
105. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
106. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
107. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
108. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
109. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
110. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
111. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
112. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
113. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
114. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
115. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
116. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
117. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
118. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
119. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
120. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
121. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// Gets the<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
122. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
123. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
124. <Button  Content="清空"  Command="{Binding ClearCommand}"   />instance to resolve application services.<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
125. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
126. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
127. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
128. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
129. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
130. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
131. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
132. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
133. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
134. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
135. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
136. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
137. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
138. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
139. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
140. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
141. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
142. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public IServiceProvider Services { get; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
143. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
144. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
145. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
146. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
147. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
148. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
149. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
150. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
151. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
152. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
153. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
154. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
155. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
156. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
157. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
158. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
159. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
160. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// Configures the services for the application.<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
161. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
162. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
163. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
164. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
165. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
166. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
167. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
168. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
169. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
170. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
171. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
172. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
173. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
174. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
175. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
176. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
177. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
178. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private static IServiceProvider ConfigureServices()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
179. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
180. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
181. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
182. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
183. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
184. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
185. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
186. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
187. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
188. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
189. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
190. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
191. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
192. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
193. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
194. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
195. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
196. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
197. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
198. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
199. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
200. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
201. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
202. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
203. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
204. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
205. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
206. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
207. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
208. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
209. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
210. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
211. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
212. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
213. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
214. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
215. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
216. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
217. <Button  Content="清空"  Command="{Binding ClearCommand}"   />var services = new ServiceCollection();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
218. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
219. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
220. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
221. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
222. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
223. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
224. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
225. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
226. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
227. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
228. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
229. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
230. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
231. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
232. <Button  Content="清空"  Command="{Binding ClearCommand}"   />services.AddTransient();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
233. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
234. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
235. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
236. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
237. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
238. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
239. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
240. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
241. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
242. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
243. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
244. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
245. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
246. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
247. <Button  Content="清空"  Command="{Binding ClearCommand}"   />services.AddTransient();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
248. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
249. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
250. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
251. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
252. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
253. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
254. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
255. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
256. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
257. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
258. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
259. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
260. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
261. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
262. <Button  Content="清空"  Command="{Binding ClearCommand}"   />services.AddTransient();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
263. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
264. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
265. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
266. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
267. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
268. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
269. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
270. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
271. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
272. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
273. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
274. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
275. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
276. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
277. <Button  Content="清空"  Command="{Binding ClearCommand}"   />services.AddTransient(sp=>new MainWindow() { DataContext=sp.GetRequiredService()});<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
278. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
279. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
280. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
281. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
282. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
283. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
284. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
285. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
286. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
287. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
288. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
289. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
290. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
291. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
292. <Button  Content="清空"  Command="{Binding ClearCommand}"   />return services.BuildServiceProvider();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
293. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
294. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
295. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
296. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
297. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
298. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
299. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
300. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
301. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
302. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
303. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
304. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
305. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
306. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
307. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
308. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
309. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
310. <Button  Content="清空"  Command="{Binding ClearCommand}"   />protected override void OnStartup(StartupEventArgs e)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
311. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
312. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
313. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
314. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
315. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
316. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
317. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
318. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
319. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
320. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
321. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
322. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
323. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
324. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
325. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
326. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
327. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
328. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
329. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
330. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
331. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
332. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
333. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
334. <Button  Content="清空"  Command="{Binding ClearCommand}"   />base.OnStartup(e);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
335. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
336. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
337. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
338. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
339. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
340. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
341. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
342. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
343. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
344. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
345. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
346. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
347. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
348. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
349. <Button  Content="清空"  Command="{Binding ClearCommand}"   />MainWindow= Services.GetRequiredService();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
350. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
351. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
352. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
353. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
354. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
355. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
356. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
357. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
358. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
359. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
360. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
361. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
362. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
363. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
364. <Button  Content="清空"  Command="{Binding ClearCommand}"   />MainWindow.Show();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
365. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
366. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
367. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
368. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
369. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
370. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
371. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
372. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
373. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
374. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
375. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
376. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}

复制代码

1. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public partial class MainWindow : Window<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public MainWindow()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
32. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
33. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
34. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
53. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
54. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
55. <Button  Content="清空"  Command="{Binding ClearCommand}"   />InitializeComponent();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
56. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
57. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
58. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
59. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
60. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
61. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
62. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
63. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
64. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
65. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
66. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
67. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
68. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
69. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
70. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
71. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
72. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
73. <Button  Content="清空"  Command="{Binding ClearCommand}"   />DataContext =App.Current.Services.GetService();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
74. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
75. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
76. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
77. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
78. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
79. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}

复制代码

6、如果不用依赖注入的方式，可以在MainWindow.xaml或者MainWindow.cs将MainWindow的DataContext赋值给ViewModel。

1. <TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   />

复制代码

1. public partial class MainWindow : Window {<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> public MainWindow()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> {<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> InitializeComponent();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
32. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
33. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
34. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> DataContext =new KeyPressViewModel();<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> } }

复制代码

以上就是自己去实现mvvm的方式，会比较繁琐，如果不是复杂的项目大多数还是用社区的CommunityToolkit.MVVM，复杂的项目可以使用Prism
二、使用微软社区的CommunityToolkit.MVVM

1、首先安装CommunityToolkit.MVVM的包。

2、创建一个新的类KeyPressViewModelCommunityToolkit类，继承ObservableObject，CommunityToolkit代码就简洁很多了，直接在方法或者属性上面加特性就可以。

1. public partial class KeyPressViewModelCommunityToolkit : ObservableObject{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   />[ObservableProperty]<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private string cardNumber = string.Empty;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   />[ObservableProperty]<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private int selectionStart;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
32. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
33. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
34. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 数字点击事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> ///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
53. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
54. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
55. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> [RelayCommand]<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
56. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
57. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
58. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
59. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
60. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
61. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private void Number(string? key)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
62. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
63. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
64. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
65. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
66. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
67. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
68. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
69. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
70. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
71. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
72. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
73. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
74. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
75. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
76. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
77. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
78. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
79. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber += key;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
92. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
93. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
94. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
95. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
96. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
97. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 清空输入框<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
98. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
99. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
100. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
101. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
102. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
103. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
104. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
105. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
106. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
107. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
108. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
109. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> [RelayCommand]<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
110. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
111. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
112. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
113. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
114. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
115. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private void Clear()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
116. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
117. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
118. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
119. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
120. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
121. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
122. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
123. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
124. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
125. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
126. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
127. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
128. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
129. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
130. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
131. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
132. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
133. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = string.Empty;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
134. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
135. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
136. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
137. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
138. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
139. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
140. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
141. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
142. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
143. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
144. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
145. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
146. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
147. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
148. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
149. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
150. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
151. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 删除点击事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
152. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
153. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
154. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
155. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
156. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
157. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
158. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
159. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
160. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
161. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
162. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
163. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> [RelayCommand]<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
164. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
165. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
166. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
167. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
168. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
169. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private void Delete()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
170. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
171. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
172. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
173. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
174. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
175. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
176. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
177. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
178. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
179. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
180. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
181. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
182. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
183. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
184. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
185. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
186. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
187. <Button  Content="清空"  Command="{Binding ClearCommand}"   />// 光标在输入框时，删除光标前一个字符<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
188. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
189. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
190. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
191. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
192. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
193. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
194. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
195. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
196. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
197. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
198. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
199. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (!string.IsNullOrEmpty(CardNumber) && SelectionStart > 0)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
200. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
201. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
202. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
203. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
204. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
205. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
206. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
207. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
208. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
209. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
210. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
211. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
212. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
213. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
214. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
215. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
216. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
217. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
218. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
219. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
220. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
221. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
222. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
223. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
224. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
225. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
226. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
227. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
228. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
229. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = CardNumber.Remove(SelectionStart - 1, 1);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
230. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
231. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
232. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
233. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
234. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
235. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
236. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
237. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
238. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
239. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
240. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
241. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
242. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
243. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
244. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
245. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
246. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
247. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
248. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
249. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
250. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
251. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
252. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
253. <Button  Content="清空"  Command="{Binding ClearCommand}"   />//光标没有在输入框时，删除最后一个字符<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
254. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
255. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
256. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
257. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
258. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
259. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
260. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
261. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
262. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
263. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
264. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
265. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (SelectionStart == 0)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
266. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
267. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
268. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
269. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
270. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
271. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
272. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
273. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
274. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
275. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
276. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
277. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
278. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
279. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
280. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
281. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
282. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
283. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
284. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
285. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
286. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
287. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
288. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
289. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
290. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
291. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
292. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
293. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
294. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
295. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = CardNumber.Remove(CardNumber.Length - 1, 1);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
296. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
297. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
298. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
299. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
300. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
301. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
302. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
303. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
304. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
305. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
306. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
307. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
308. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
309. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
310. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
311. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
312. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
313. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}}

复制代码

三、Prism

1、安装Prism.Core和Prism.Wpf,其他的包根据后续实际使用在安装。

2、创建一个KeyPressViewModelPrism类继承BindableBase。

1. public partial class KeyPressViewModelPrism : BindableBase{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
2. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
3. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
4. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
5. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
6. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
7. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private string cardNumber;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
8. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
9. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
10. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
11. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
12. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
13. <Button  Content="清空"  Command="{Binding ClearCommand}"   />private int selectionStart;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
14. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
15. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
16. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
17. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
18. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
19. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public string CardNumber<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
20. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
21. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
22. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
23. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
24. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
25. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
26. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
27. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
28. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
29. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
30. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
31. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
32. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
33. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
34. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
35. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
36. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
37. <Button  Content="清空"  Command="{Binding ClearCommand}"   />get { return cardNumber; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
38. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
39. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
40. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
41. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
42. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
43. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
44. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
45. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
46. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
47. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
48. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
49. <Button  Content="清空"  Command="{Binding ClearCommand}"   />set { SetProperty(ref cardNumber, value); }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
50. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
51. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
52. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
53. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
54. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
55. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
56. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
57. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
58. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
59. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
60. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
61. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public int SelectionStart<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
62. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
63. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
64. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
65. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
66. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
67. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
68. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
69. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
70. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
71. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
72. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
73. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
74. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
75. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
76. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
77. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
78. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
79. <Button  Content="清空"  Command="{Binding ClearCommand}"   />get { return selectionStart; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
80. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
81. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
82. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
83. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
84. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
85. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
86. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
87. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
88. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
89. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
90. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
91. <Button  Content="清空"  Command="{Binding ClearCommand}"   />set { SetProperty(ref selectionStart, value); }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
92. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
93. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
94. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
95. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
96. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
97. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
98. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
99. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
100. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
101. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
102. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
103. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public DelegateCommand NumberCommand { get; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
104. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
105. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
106. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
107. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
108. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
109. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public DelegateCommand ClearCommand { get; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
110. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
111. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
112. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
113. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
114. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
115. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public DelegateCommand DeleteCommand { get; }<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
116. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
117. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
118. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
119. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
120. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
121. <Button  Content="清空"  Command="{Binding ClearCommand}"   />public KeyPressViewModelPrism()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
122. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
123. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
124. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
125. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
126. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
127. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
128. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
129. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
130. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
131. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
132. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
133. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
134. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
135. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
136. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
137. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
138. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
139. <Button  Content="清空"  Command="{Binding ClearCommand}"   />NumberCommand = new DelegateCommand(Number);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
140. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
141. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
142. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
143. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
144. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
145. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
146. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
147. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
148. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
149. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
150. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
151. <Button  Content="清空"  Command="{Binding ClearCommand}"   />ClearCommand = new DelegateCommand(Clear);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
152. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
153. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
154. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
155. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
156. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
157. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
158. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
159. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
160. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
161. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
162. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
163. <Button  Content="清空"  Command="{Binding ClearCommand}"   />DeleteCommand = new DelegateCommand(Delete);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
164. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
165. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
166. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
167. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
168. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
169. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
170. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
171. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
172. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
173. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
174. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
175. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
176. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
177. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
178. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
179. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
180. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
181. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 数字点击事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
182. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
183. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
184. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
185. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
186. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
187. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
188. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
189. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
190. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
191. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
192. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
193. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> ///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
194. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
195. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
196. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
197. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
198. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
199. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Number(string? key)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
200. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
201. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
202. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
203. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
204. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
205. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
206. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
207. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
208. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
209. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
210. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
211. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
212. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
213. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
214. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
215. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
216. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
217. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber += key;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
218. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
219. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
220. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
221. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
222. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
223. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
224. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
225. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
226. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
227. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
228. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
229. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
230. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
231. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
232. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
233. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
234. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
235. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 清空点击事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
236. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
237. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
238. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
239. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
240. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
241. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
242. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
243. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
244. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
245. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
246. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
247. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Clear()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
248. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
249. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
250. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
251. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
252. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
253. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
254. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
255. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
256. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
257. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
258. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
259. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
260. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
261. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
262. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
263. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
264. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
265. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = string.Empty;<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
266. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
267. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
268. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
269. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
270. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
271. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
272. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
273. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
274. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
275. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
276. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
277. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
278. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
279. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
280. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
281. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
282. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
283. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> /// 删除点击事件<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
284. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
285. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
286. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
287. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
288. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
289. <Button  Content="清空"  Command="{Binding ClearCommand}"   />///<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
290. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
291. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
292. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
293. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
294. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
295. <Button  Content="清空"  Command="{Binding ClearCommand}"   /> private void Delete()<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
296. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
297. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
298. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
299. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
300. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
301. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
302. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
303. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
304. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
305. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
306. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
307. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
308. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
309. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
310. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
311. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
312. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
313. <Button  Content="清空"  Command="{Binding ClearCommand}"   />// 光标在输入框时，删除光标前一个字符<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
314. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
315. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
316. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
317. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
318. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
319. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
320. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
321. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
322. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
323. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
324. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
325. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (!string.IsNullOrEmpty(CardNumber) && SelectionStart > 0)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
326. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
327. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
328. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
329. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
330. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
331. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
332. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
333. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
334. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
335. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
336. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
337. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
338. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
339. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
340. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
341. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
342. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
343. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
344. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
345. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
346. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
347. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
348. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
349. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
350. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
351. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
352. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
353. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
354. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
355. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = CardNumber.Remove(SelectionStart - 1, 1);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
356. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
357. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
358. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
359. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
360. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
361. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
362. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
363. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
364. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
365. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
366. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
367. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
368. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
369. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
370. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
371. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
372. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
373. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
374. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
375. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
376. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
377. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
378. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
379. <Button  Content="清空"  Command="{Binding ClearCommand}"   />//光标没有在输入框时，删除最后一个字符<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
380. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
381. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
382. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
383. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
384. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
385. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
386. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
387. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
388. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
389. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
390. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
391. <Button  Content="清空"  Command="{Binding ClearCommand}"   />if (SelectionStart == 0)<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
392. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
393. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
394. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
395. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
396. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
397. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
398. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
399. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
400. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
401. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
402. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
403. <Button  Content="清空"  Command="{Binding ClearCommand}"   />{<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
404. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
405. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
406. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
407. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
408. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
409. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
410. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
411. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
412. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
413. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
414. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
415. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
416. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
417. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
418. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
419. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
420. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
421. <Button  Content="清空"  Command="{Binding ClearCommand}"   />CardNumber = CardNumber.Remove(CardNumber.Length - 1, 1);<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
422. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
423. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
424. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
425. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
426. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
427. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
428. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
429. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
430. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
431. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
432. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
433. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}<TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
434. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
435. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
436. <Button  Content="清空"  Command="{Binding ClearCommand}"   /><TextBox Text="{Binding CardNumber}"     x:Name="CardNumberTextBox"   local:TextBoxSelectionHelper.SelectionStart="{Binding SelectionStart, Mode=TwoWay}" Height="40"     Width="460" />  
437. <Button  Content="1"  Command="{Binding NumberCommand}"  CommandParameter="1"/>
438. <Button  Content="删除"  Command="{Binding DeleteCommand}"   />
439. <Button  Content="清空"  Command="{Binding ClearCommand}"   />}}

复制代码

四、总结

以上就是三种不同ViewModel的实现方式，个人比较推荐使用社区的CommunityToolkit，但是还是要根据自己的项目情况来决定。

来源：程序园用户自行投稿发布，如果侵权，请联系站长删除
免责声明：如果侵犯了您的权益，请联系站长，我们会及时删除侵权内容，谢谢合作！