社区 › 业界 › C# WPF 内置解码器实现 GIF 动图控件

齐娅晶 发表于 2025-8-11 09:21:20

C# WPF 内置解码器实现 GIF 动图控件

相对于 WinForm PictureBox 控件原生支持动态 GIF，WPF Image 控件却不支持，让人摸不着头脑
常用方法

提到 WPF 播放动图，常见的方法有三种
MediaElement

使用 MediaElement 控件，缺点是依赖 Media Player，且不支持透明
WinForm PictureBox

借助 WindowsFormsIntegration 嵌入 WinForm PictureBox，缺点是不支持透明
<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>WpfAnimatedGif

引用 NuGet 包 WpfAnimatedGif，支持透明
作者还有另一个性能更好、跨平台的 XamlAnimatedGif，用法相同
原生解码方法

WPF 虽然原生 Image 不支持 GIF 动图，但是提供了 GifBitmapDecoder 解码器，可以获取元数据，包括循环信息、逻辑尺寸、所有帧信息等
判断是否循环和循环次数

int loop = 1;bool isAnimated = true;var decoder = new GifBitmapDecoder(stream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);var data = decoder.Metadata;if (data.GetQuery("/appext/Application") is byte[] array1){<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>string appName = Encoding.ASCII.GetString(array1);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if ((appName == "NETSCAPE2.0" || appName == "ANIMEXTS1.0")<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>&& data.GetQuery("/appext/Data") is byte[] array2)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>loop = array2 | array2(Uri)GetValue(UriSourceProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>set => SetValue(UriSourceProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public Stream StreamSource<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>get => (Stream)GetValue(StreamSourceProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>set => SetValue(StreamSourceProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public int FrameIndex<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>get => (int)GetValue(FrameIndexProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private set => SetValue(FrameIndexProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public Stretch Stretch<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>get => (Stretch)GetValue(StretchProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>set => SetValue(StretchProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public StretchDirection StretchDirection<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>get => (StretchDirection)GetValue(StretchDirectionProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>set => SetValue(StretchDirectionProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public bool IsLoading<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>get => (bool)GetValue(IsLoadingProperty);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>set => SetValue(IsLoadingProperty, value);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>((GifImage)d)?.OnSourceChanged();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private static void OnFrameIndexChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>((GifImage)d)?.OnFrameIndexChanged();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private static void OnStrechChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (d is GifImage image && image.Content is Viewbox viewbox)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>viewbox.Stretch = image.Stretch;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private static void OnStrechDirectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (d is GifImage image && image.Content is Viewbox viewbox)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>viewbox.StretchDirection = image.StretchDirection;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Stream stream;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Canvas canvas;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>FrameInfo[] frameInfos;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Int32AnimationUsingKeyFrames animation;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public GifImage()<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>IsVisibleChanged += OnIsVisibleChanged;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Unloaded += OnUnloaded;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private void OnUnloaded(object sender, RoutedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Release();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private void OnIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (IsVisible)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>StartAnimation();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>else<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>StopAnimation();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private void StartAnimation()<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>BeginAnimation(FrameIndexProperty, animation);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private void StopAnimation()<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>BeginAnimation(FrameIndexProperty, null);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private void Release()<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>StopAnimation();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>canvas?.Children.Clear();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>stream?.Dispose();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>animation = null;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>frameInfos = null;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>private async void OnSourceChanged()<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>Release();<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>IsLoading = true;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>FrameIndex = 0;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (UriSource != null)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>stream = await ResourceHelper.GetStream(UriSource);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>else<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>stream = StreamSource;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (stream != null)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>int loop = 1;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>bool isAnimated = true;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>var decoder = new GifBitmapDecoder(stream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>var data = decoder.Metadata;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (data.GetQuery("/appext/Application") is byte[] array1)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>string appName = Encoding.ASCII.GetString(array1);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if ((appName == "NETSCAPE2.0" || appName == "ANIMEXTS1.0")<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>&& data.GetQuery("/appext/Data") is byte[] array2)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>loop = array2 | array20)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>var previousInfo = frameInfos;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>switch (previousInfo.DisposalMethod)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>case DisposalMethod.RestoreBackground:<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>// 隐藏之前的所有帧<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>for (int i = 0; i < index - 1; i++)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>frameInfos.Frame.Visibility = Visibility.Hidden;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>break;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>case DisposalMethod.RestorePrevious:<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>// 隐藏上一帧<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>previousInfo.Frame.Visibility = Visibility.Hidden;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>break;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>else<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>// 重新循环, 只显示第一帧<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>for (int i = 1; i < frameInfos.Length; i++)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>frameInfos.Frame.Visibility = Visibility.Hidden;<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}}使用到的从 URL 获取图像流的方法

using System;using System.IO;using System.IO.Packaging;using System.Net;using System.Threading.Tasks;using System.Windows;public static class ResourceHelper{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>public static Task GetStream(Uri uri)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (!uri.IsAbsoluteUri)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>throw new ArgumentException("uri must be absolute");<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (uri.Scheme == Uri.UriSchemeHttps<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>|| uri.Scheme == Uri.UriSchemeHttp<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>|| uri.Scheme == Uri.UriSchemeFtp)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>return Task.Run(() =><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>using (var client = new WebClient())<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>byte[] data = client.DownloadData(uri);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>return new MemoryStream(data);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>});<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>else if (uri.Scheme == PackUriHelper.UriSchemePack)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>var info = uri.Authority == "siteoforigin:,,,"<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>? Application.GetRemoteStream(uri)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>: Application.GetResourceStream(uri);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>if (info != null)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>return Task.FromResult(info.Stream);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>else if (uri.Scheme == Uri.UriSchemeFile)<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>{<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>return Task.FromResult(File.OpenRead(uri.LocalPath));<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost><WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>throw new FileNotFoundException(uri.OriginalString);<WindowsFormsHost>
    <wf:PictureBox x:Name="winFormsPictureBox"/>
</WindowsFormsHost>}}调用示例

ImageAnimator

WinForm 中播放 GIF 用到了 ImageAnimator，利用它也可以在 WPF 中实现 GIF 动图控件，但其是基于 GDI 的方法，更推荐性能更好、支持硬解的解码器方法
using System;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;

public sealed class GifImage : ContentControl
{
    /// <summary>当前帧播放完成后的处理方法</summary>
    enum DisposalMethod
    {
      /// <summary>被全尺寸不透明的下一帧覆盖替换</summary>
      None,
      /// <summary>不丢弃, 继续显示下一帧未覆盖的任何像素</summary>
      DoNotDispose,
      /// <summary>重置到背景色</summary>
      RestoreBackground,
      /// <summary>恢复到上一个未释放的帧的状态</summary>
      RestorePrevious,
    }

    sealed class FrameInfo
    {
      public Image Frame { get; }
      public int DelayTime { get; }
      public DisposalMethod DisposalMethod { get; }

      public FrameInfo(BitmapFrame frame)
      {
            Frame = new Image { Source = frame };
            var data = (BitmapMetadata)frame.Metadata;
            DelayTime = Convert.ToUInt16(data.GetQuery("/grctlext/Delay"));
            DisposalMethod = (DisposalMethod)Convert.ToByte(data.GetQuery("/grctlext/Disposal"));
            ushort left = Convert.ToUInt16(data.GetQuery("/imgdesc/Left"));
            ushort top = Convert.ToUInt16(data.GetQuery("/imgdesc/Top"));
            ushort width = Convert.ToUInt16(data.GetQuery("/imgdesc/Width"));
            ushort height = Convert.ToUInt16(data.GetQuery("/imgdesc/Height"));
            Canvas.SetLeft(Frame, left);
            Canvas.SetTop(Frame, top);
            Canvas.SetRight(Frame, left + width);
            Canvas.SetBottom(Frame, top + height);
      }
    }

    public static readonly DependencyProperty UriSourceProperty =
      DependencyProperty.Register(nameof(UriSource), typeof(Uri), typeof(GifImage), new PropertyMetadata(null, OnSourceChanged));

    public static readonly DependencyProperty StreamSourceProperty =
      DependencyProperty.Register(nameof(StreamSource), typeof(Stream), typeof(GifImage), new PropertyMetadata(null, OnSourceChanged));

    public static readonly DependencyProperty FrameIndexProperty =
      DependencyProperty.Register(nameof(FrameIndex), typeof(int), typeof(GifImage), new PropertyMetadata(0, OnFrameIndexChanged));

    public static readonly DependencyProperty StretchProperty =
      DependencyProperty.Register(nameof(Stretch), typeof(Stretch), typeof(GifImage), new PropertyMetadata(Stretch.None, OnStrechChanged));

    public static readonly DependencyProperty StretchDirectionProperty =
      DependencyProperty.Register(nameof(StretchDirection), typeof(StretchDirection), typeof(GifImage), new PropertyMetadata(StretchDirection.Both, OnStrechDirectionChanged));

    public static readonly DependencyProperty IsLoadingProperty =
      DependencyProperty.Register(nameof(IsLoading), typeof(bool), typeof(GifImage), new PropertyMetadata(false));

    public Uri UriSource
    {
      get => (Uri)GetValue(UriSourceProperty);
      set => SetValue(UriSourceProperty, value);
    }

    public Stream StreamSource
    {
      get => (Stream)GetValue(StreamSourceProperty);
      set => SetValue(StreamSourceProperty, value);
    }

    public int FrameIndex
    {
      get => (int)GetValue(FrameIndexProperty);
      private set => SetValue(FrameIndexProperty, value);
    }

    public Stretch Stretch
    {
      get => (Stretch)GetValue(StretchProperty);
      set => SetValue(StretchProperty, value);
    }

    public StretchDirection StretchDirection
    {
      get => (StretchDirection)GetValue(StretchDirectionProperty);
      set => SetValue(StretchDirectionProperty, value);
    }

    public bool IsLoading
    {
      get => (bool)GetValue(IsLoadingProperty);
      set => SetValue(IsLoadingProperty, value);
    }

    private static void OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      ((GifImage)d)?.OnSourceChanged();
    }

    private static void OnFrameIndexChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      ((GifImage)d)?.OnFrameIndexChanged();
    }

    private static void OnStrechChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      if (d is GifImage image && image.Content is Viewbox viewbox)
      {
            viewbox.Stretch = image.Stretch;
      }
    }

    private static void OnStrechDirectionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
      if (d is GifImage image && image.Content is Viewbox viewbox)
      {
            viewbox.StretchDirection = image.StretchDirection;
      }
    }

    Stream stream;
    Canvas canvas;
    FrameInfo[] frameInfos;
    Int32AnimationUsingKeyFrames animation;

    public GifImage()
    {
      IsVisibleChanged += OnIsVisibleChanged;
      Unloaded += OnUnloaded;
    }

    private void OnUnloaded(object sender, RoutedEventArgs e)
    {
      Release();
    }

    private void OnIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
      if (IsVisible)
      {
            StartAnimation();
      }
      else
      {
            StopAnimation();
      }
    }

    private void StartAnimation()
    {
      BeginAnimation(FrameIndexProperty, animation);
    }

    private void StopAnimation()
    {
      BeginAnimation(FrameIndexProperty, null);
    }

    private void Release()
    {
      StopAnimation();
      canvas?.Children.Clear();
      stream?.Dispose();
      animation = null;
      frameInfos = null;
    }

    private async void OnSourceChanged()
    {
      Release();
      IsLoading = true;
      FrameIndex = 0;
      if (UriSource != null)
      {
            stream = await ResourceHelper.GetStream(UriSource);
      }
      else
      {
            stream = StreamSource;
      }
      if (stream != null)
      {
            int loop = 1;
            bool isAnimated = true;
            var decoder = new GifBitmapDecoder(stream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
            var data = decoder.Metadata;
            if (data.GetQuery("/appext/Application") is byte[] array1)
            {
                string appName = Encoding.ASCII.GetString(array1);
                if ((appName == "NETSCAPE2.0" || appName == "ANIMEXTS1.0")
                  && data.GetQuery("/appext/Data") is byte[] array2)
                {
                  loop = array2 | array2 << 8;// 获取循环次数, 0表示无限循环
                  isAnimated = array2 == 1;
                }
            }
            if (!(Content is Viewbox viewbox))
            {
                Content = viewbox = new Viewbox
                {
                  Stretch = Stretch,
                  StretchDirection = StretchDirection,
                };
            }
            if (canvas == null || canvas.Parent != Content)
            {
                canvas = new Canvas();
                viewbox.Child = canvas;
            }
            canvas.Width = Convert.ToUInt16(data.GetQuery("/logscrdesc/Width"));
            canvas.Height = Convert.ToUInt16(data.GetQuery("/logscrdesc/Height"));
            int count = decoder.Frames.Count;
            frameInfos = new FrameInfo;
            for (int i = 0; i < count; i++)
            {
                var info = new FrameInfo(decoder.Frames);
                Image frame = info.Frame;
                frameInfos = info;
                canvas.Children.Add(frame);
                Panel.SetZIndex(frame, i);
                canvas.Width = Math.Max(canvas.Width, Canvas.GetRight(frame));
                canvas.Height = Math.Max(canvas.Height, Canvas.GetBottom(frame));
            }
            OnFrameIndexChanged();
            if (isAnimated)
            {
                var keyFrames = new Int32KeyFrameCollection();
                var last = TimeSpan.Zero;
                for (int i = 0; i < frameInfos.Length; i++)
                {
                  last += TimeSpan.FromMilliseconds(frameInfos.DelayTime * 10);
                  keyFrames.Add(new DiscreteInt32KeyFrame(i, last));
                }
                animation = new Int32AnimationUsingKeyFrames
                {
                  KeyFrames = keyFrames,
                  RepeatBehavior = loop == 0 ? RepeatBehavior.Forever : new RepeatBehavior(loop)
                };
                StartAnimation();
            }
      }
      IsLoading = false;
    }

    private void OnFrameIndexChanged()
    {
      if (frameInfos != null)
      {
            int index = FrameIndex;
            frameInfos.Frame.Visibility = Visibility.Visible;
            if (index > 0)
            {
                var previousInfo = frameInfos;
                switch (previousInfo.DisposalMethod)
                {
                  case DisposalMethod.RestoreBackground:
                        // 隐藏之前的所有帧
                        for (int i = 0; i < index - 1; i++)
                        {
                            frameInfos.Frame.Visibility = Visibility.Hidden;
                        }
                        break;
                  case DisposalMethod.RestorePrevious:
                        // 隐藏上一帧
                        previousInfo.Frame.Visibility = Visibility.Hidden;
                        break;
                }
            }
            else
            {
                // 重新循环, 只显示第一帧
                for (int i = 1; i < frameInfos.Length; i++)
                {
                  frameInfos.Frame.Visibility = Visibility.Hidden;
                }
            }
      }
    }
}透明 GIF

GIF 本身只有 256 色，没有 Alpha 通道，但其仍支持透明，是通过其特殊的自定义颜色表调色盘实现的

上图是一张单帧透明 GIF，使用 Windows 自带画图打开，会错误显示为橙色背景

放入 WinForm PictureBox 中，Win7 和较旧的 Win10 也会错误显示为橙色背景
但最新的 Win11 和 Win10 上会显示为透明背景，猜测是近期 Win11 在截图工具中推出了录制 GIF 功能时顺手更新了 .NET System.Drawing GIF 解析方法，Win10 也收到了这次补丁更新
不过使用 WPF 解码器方法能过获得正确的背景
相关资料

Table of Contents
Native Image Format Metadata Queries - Win32 apps
WICGifGraphicControlExtensionProperties (wincodec.h) - Win32 apps | Microsoft Learn
WICGifImageDescriptorProperties (wincodec.h) - Win32 apps | Microsoft Learn
在WPF中显示动态GIF - 周银辉 - 博客园
wpf GifBitmapDecoder 解析 gif 格式
浓缩的才是精华：浅析GIF格式图片的存储和压缩 - 腾讯云开发者 - 博客园

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查看完整版本: C# WPF 内置解码器实现 GIF 动图控件