GifImage.Initialize()方法的小改进，该方法从GIF元数据中读取适当的帧定时。

    private void Initialize()
    {
        _gifDecoder = new GifBitmapDecoder(new Uri("pack://application:,,," + this.GifSource), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);

        int duration=0;
        _animation = new Int32AnimationUsingKeyFrames();
        _animation.KeyFrames.Add(new DiscreteInt32KeyFrame(0, KeyTime.FromTimeSpan(new TimeSpan(0))));
        foreach (BitmapFrame frame in _gifDecoder.Frames)
        {
            BitmapMetadata btmd = (BitmapMetadata)frame.Metadata;
            duration += (ushort)btmd.GetQuery("/grctlext/Delay");
            _animation.KeyFrames.Add(new DiscreteInt32KeyFrame(_gifDecoder.Frames.IndexOf(frame)+1, KeyTime.FromTimeSpan(new TimeSpan(duration*100000))));
        }            
         _animation.RepeatBehavior = RepeatBehavior.Forever;
        this.Source = _gifDecoder.Frames[0];            
        _isInitialized = true;
    }

我有这个问题，直到我发现在WPF4，你可以模拟自己的关键帧图像动画。首先，将你的动画分割成一系列图像，并将它们命名为“Image1.gif”，“Image2,gif”，等等。将这些映像导入您的解决方案资源中。我假设您将它们放在图像的默认资源位置。

您将使用Image控件。使用下面的XAML代码。我已经去掉了不重要的部分。

<Image Name="Image1">
   <Image.Triggers>
      <EventTrigger RoutedEvent="Image.Loaded"
         <EventTrigger.Actions>
            <BeginStoryboard>
               <Storyboard>
                   <ObjectAnimationUsingKeyFrames Duration="0:0:1" Storyboard.TargetProperty="Source" RepeatBehavior="Forever">
                      <DiscreteObjectKeyFrames KeyTime="0:0:0">
                         <DiscreteObjectKeyFrame.Value>
                            <BitmapImage UriSource="Images/Image1.gif"/>
                         </DiscreteObjectKeyFrame.Value>
                      </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.25">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image2.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.5">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image3.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.75">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image4.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:1">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image5.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                  </ObjectAnimationUsingKeyFrames>
               </Storyboard>
            </BeginStoryboard>
         </EventTrigger.Actions>
      </EventTrigger>
   </Image.Triggers>
</Image>

这个小程序怎么样: 背后的代码:

public MainWindow()
{
  InitializeComponent();
  Files = Directory.GetFiles(@"I:\images");
  this.DataContext= this;
}
public string[] Files
{get;set;}

XAML:

<Window x:Class="PicViewer.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="175" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <ListBox x:Name="lst" ItemsSource="{Binding Path=Files}"/>
        <MediaElement Grid.Column="1" LoadedBehavior="Play" Source="{Binding ElementName=lst, Path=SelectedItem}" Stretch="None"/>
    </Grid>
</Window>

我使用这个库:https://github.com/XamlAnimatedGif/WpfAnimatedGif

首先，将库安装到项目中(使用包管理器控制台):

    PM > Install-Package WpfAnimatedGif

然后，使用这个片段到XAML文件:

    <Window x:Class="WpfAnimatedGif.Demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:gif="http://wpfanimatedgif.codeplex.com"
        Title="MainWindow" Height="350" Width="525">
        <Grid>
            <Image gif:ImageBehavior.AnimatedSource="Images/animated.gif" />
        ...

希望能有所帮助。

来源:https://github.com/XamlAnimatedGif/WpfAnimatedGif

检查我的代码，我希望这对你有帮助:)

         public async Task GIF_Animation_Pro(string FileName,int speed,bool _Repeat)
                    {
    int ab=0;
                        var gif = GifBitmapDecoder.Create(new Uri(FileName), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                        var getFrames = gif.Frames;
                        BitmapFrame[] frames = getFrames.ToArray();
                        await Task.Run(() =>
                        {


                            while (ab < getFrames.Count())
                            {
                                Thread.Sleep(speed);
try
{
                                Dispatcher.Invoke(() =>
                                {
                                    gifImage.Source = frames[ab];
                                });
                                if (ab == getFrames.Count - 1&&_Repeat)
                                {
                                    ab = 0;

                                }
                                ab++;
            }
 catch
{
}

                            }
                        });
                    }

or

     public async Task GIF_Animation_Pro(Stream stream, int speed,bool _Repeat)
            {
 int ab = 0;   
                var gif = GifBitmapDecoder.Create(stream , BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
                var getFrames = gif.Frames;
                BitmapFrame[] frames = getFrames.ToArray();
                await Task.Run(() =>
                {


                    while (ab < getFrames.Count())
                    {
                        Thread.Sleep(speed);
    try
    {


                     Dispatcher.Invoke(() =>
                        {
                            gifImage.Source = frames[ab];
                        });
                        if (ab == getFrames.Count - 1&&_Repeat)
                        {
                            ab = 0;

                        }
                        ab++;
    }
     catch{} 



                    }
                });
            }

我建议使用WebBrowser控件。

如果gif在网络上，你可以在XAML中设置源代码:

<WebBrowser Source="https://media.giphy.com/media/Ent2j55lyQipa/giphy.gif" />

如果它是一个本地文件，您可以从后台代码创建源代码。

XAML:

<WebBrowser x:Name="WebBrowser" />

后台代码:

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    string curDir = Directory.GetCurrentDirectory();
    this.WebBrowser.Source = new Uri(String.Format("file:///{0}/10-monkey.gif", curDir));
}