我应该使用什么样的控制类型 - Image，MediaElement等？
我无法得到这个问题（Dario上面）最流行的答案才能正常工作。结果是奇怪的，不稳定的动画与奇怪的文物。到目前为止我找到的最佳解决方案：https://github.com/XamlAnimatedGif/WpfAnimatedGif
您可以使用NuGet进行安装
PM> Install-Package WpfAnimatedGif
并在窗口的新命名空间中使用它，在那里您要添加gif图像并使用它，如下所示
<Window x:Class="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" <!-- THIS NAMESPACE -->
Title="MainWindow" Height="350" Width="525">
<Grid>
<!-- EXAMPLE USAGE BELOW -->
<Image gif:ImageBehavior.AnimatedSource="Images/animated.gif" />
包真的很整洁，你可以设置一些属性，如下所示
<Image gif:ImageBehavior.RepeatBehavior="3x"
gif:ImageBehavior.AnimatedSource="Images/animated.gif" />
你也可以在你的代码中使用它：
var image = new BitmapImage();
image.BeginInit();
image.UriSource = new Uri(fileName);
image.EndInit();
ImageBehavior.SetAnimatedSource(img, image);
编辑：Silverlight支持
根据josh2112的评论，如果你想为你的Silverlight项目添加动画GIF支持，那么使用github.com/XamlAnimatedGif/XamlAnimatedGif
我有这个问题，直到我发现在WPF4中，你可以模拟你自己的关键帧图像动画。首先，将动画分成一系列图像，标题为“Image1.gif”，“Image2，gif”等。将这些图像导入解决方案资源。我假设你把它们放在图像的默认资源位置。
您将使用Image控件。使用以下XAML代码。我删除了非必需品。
<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>
感谢你的帖子Joel，它帮助我解决了WPF缺乏对动画GIF的支持。只需添加一些代码，因为Winforms api设置了pictureBoxLoading.Image属性，因为我有一段时间。
我不得不将我的动画gif图像的Build Action设置为“Content”，将Copy to output目录设置为“Copy if newer”或“always”。然后在MainWindow（）中我调用了这个方法。唯一的问题是，当我试图处理流时，它给了我一个红色信封图形而不是我的图像。我必须解决这个问题。这消除了加载BitmapImage并将其更改为Bitmap的痛苦（这显然会杀死我的动画，因为它不再是gif）。
private void SetupProgressIcon()
{
Uri uri = new Uri("pack://application:,,,/WPFTest;component/Images/animated_progress_apple.gif");
if (uri != null)
{
Stream stream = Application.GetContentStream(uri).Stream;
imgProgressBox.Image = new System.Drawing.Bitmap(stream);
}
}
我已经尝试了上面的方法，但是每个人都有自己的缺点，多亏了你们，我自己制作了自己的GifImage：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Controls;
using System.Windows;
using System.Windows.Media.Imaging;
using System.IO;
using System.Windows.Threading;
namespace IEXM.Components
{
public class GifImage : Image
{
#region gif Source, such as "/IEXM;component/Images/Expression/f020.gif"
public string GifSource
{
get { return (string)GetValue(GifSourceProperty); }
set { SetValue(GifSourceProperty, value); }
}
public static readonly DependencyProperty GifSourceProperty =
DependencyProperty.Register("GifSource", typeof(string),
typeof(GifImage), new UIPropertyMetadata(null, GifSourcePropertyChanged));
private static void GifSourcePropertyChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
(sender as GifImage).Initialize();
}
#endregion
#region control the animate
/// <summary>
/// Defines whether the animation starts on it's own
/// </summary>
public bool IsAutoStart
{
get { return (bool)GetValue(AutoStartProperty); }
set { SetValue(AutoStartProperty, value); }
}
public static readonly DependencyProperty AutoStartProperty =
DependencyProperty.Register("IsAutoStart", typeof(bool),
typeof(GifImage), new UIPropertyMetadata(false, AutoStartPropertyChanged));
private static void AutoStartPropertyChanged(DependencyObject sender,
DependencyPropertyChangedEventArgs e)
{
if ((bool)e.NewValue)
(sender as GifImage).StartAnimation();
else
(sender as GifImage).StopAnimation();
}
#endregion
private bool _isInitialized = false;
private System.Drawing.Bitmap _bitmap;
private BitmapSource _source;
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
private BitmapSource GetSource()
{
if (_bitmap == null)
{
_bitmap = new System.Drawing.Bitmap(Application.GetResourceStream(
new Uri(GifSource, UriKind.RelativeOrAbsolute)).Stream);
}
IntPtr handle = IntPtr.Zero;
handle = _bitmap.GetHbitmap();
BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
handle, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
DeleteObject(handle);
return bs;
}
private void Initialize()
{
// Console.WriteLine("Init: " + GifSource);
if (GifSource != null)
Source = GetSource();
_isInitialized = true;
}
private void FrameUpdatedCallback()
{
System.Drawing.ImageAnimator.UpdateFrames();
if (_source != null)
{
_source.Freeze();
}
_source = GetSource();
// Console.WriteLine("Working: " + GifSource);
Source = _source;
InvalidateVisual();
}
private void OnFrameChanged(object sender, EventArgs e)
{
Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(FrameUpdatedCallback));
}
/// <summary>
/// Starts the animation
/// </summary>
public void StartAnimation()
{
if (!_isInitialized)
this.Initialize();
// Console.WriteLine("Start: " + GifSource);
System.Drawing.ImageAnimator.Animate(_bitmap, OnFrameChanged);
}
/// <summary>
/// Stops the animation
/// </summary>
public void StopAnimation()
{
_isInitialized = false;
if (_bitmap != null)
{
System.Drawing.ImageAnimator.StopAnimate(_bitmap, OnFrameChanged);
_bitmap.Dispose();
_bitmap = null;
}
_source = null;
Initialize();
GC.Collect();
GC.WaitForFullGCComplete();
// Console.WriteLine("Stop: " + GifSource);
}
public void Dispose()
{
_isInitialized = false;
if (_bitmap != null)
{
System.Drawing.ImageAnimator.StopAnimate(_bitmap, OnFrameChanged);
_bitmap.Dispose();
_bitmap = null;
}
_source = null;
GC.Collect();
GC.WaitForFullGCComplete();
// Console.WriteLine("Dispose: " + GifSource);
}
}
}
用法：
<localComponents:GifImage x:Name="gifImage" IsAutoStart="True" GifSource="{Binding Path=value}" />
因为它不会导致内存泄漏并且它为gif图像自己的时间线设置动画，所以你可以尝试一下。
以前，我遇到过类似的问题，我需要在你的项目中播放.gif文件。我有两个选择：
使用PictureBox的版本对我不起作用，项目无法使用外部库。所以我通过Bitmap帮助ImageAnimator为自己做了。因为，标准的BitmapImage不支持播放.gif文件。
完整示例：
XAML
<Window x:Class="PlayGifHelp.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" Loaded="MainWindow_Loaded">
<Grid>
<Image x:Name="SampleImage" />
</Grid>
</Window>
Code behind
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
Bitmap _bitmap;
BitmapSource _source;
private BitmapSource GetSource()
{
if (_bitmap == null)
{
string path = Directory.GetCurrentDirectory();
// Check the path to the .gif file
_bitmap = new Bitmap(path + @"\anim.gif");
}
IntPtr handle = IntPtr.Zero;
handle = _bitmap.GetHbitmap();
return Imaging.CreateBitmapSourceFromHBitmap(handle, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
}
private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
_source = GetSource();
SampleImage.Source = _source;
ImageAnimator.Animate(_bitmap, OnFrameChanged);
}
private void FrameUpdatedCallback()
{
ImageAnimator.UpdateFrames();
if (_source != null)
{
_source.Freeze();
}
_source = GetSource();
SampleImage.Source = _source;
InvalidateVisual();
}
private void OnFrameChanged(object sender, EventArgs e)
{
Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(FrameUpdatedCallback));
}
}
Bitmap不支持URI指令，所以我从当前目录加载.gif文件。
GifImage.Initialize()方法的小改进，从GIF元数据中读取正确的帧时序。
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;
}
我不确定这是否已经解决，但最好的方法是使用WpfAnimatedGid library。它非常简单，直接易用。在后面的代码中只需要2行XAML代码和大约5行C＃代码。
您将看到如何在那里使用它的所有必要细节。这也是我用来代替重新发明轮子的东西
添加建议使用WpfAnimatedGif的主响应，如果要使用Gif交换图像以确保动画实际执行，则必须在最后添加以下行：
ImageBehavior.SetRepeatBehavior(img, new RepeatBehavior(0));
ImageBehavior.SetRepeatBehavior(img, RepeatBehavior.Forever);
所以你的代码看起来像：
var image = new BitmapImage();
image.BeginInit();
image.UriSource = new Uri(fileName);
image.EndInit();
ImageBehavior.SetAnimatedSource(img, image);
ImageBehavior.SetRepeatBehavior(img, new RepeatBehavior(0));
ImageBehavior.SetRepeatBehavior(img, RepeatBehavior.Forever);
检查我的代码，希望这对你有所帮助:)
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
{
}
}
});
}
要么
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{}
}
});
}
我发布了扩展图像控件和使用Gif解码器的解决方案。 gif解码器具有帧属性。我为FrameIndex财产制作动画。事件ChangingFrameIndex将源属性更改为对应于FrameIndex（即解码器中）的帧。我猜gif每秒有10帧。
class GifImage : Image
{
private bool _isInitialized;
private GifBitmapDecoder _gifDecoder;
private Int32Animation _animation;
public int FrameIndex
{
get { return (int)GetValue(FrameIndexProperty); }
set { SetValue(FrameIndexProperty, value); }
}
private void Initialize()
{
_gifDecoder = new GifBitmapDecoder(new Uri("pack://application:,,," + this.GifSource), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
_animation = new Int32Animation(0, _gifDecoder.Frames.Count - 1, new Duration(new TimeSpan(0, 0, 0, _gifDecoder.Frames.Count / 10, (int)((_gifDecoder.Frames.Count / 10.0 - _gifDecoder.Frames.Count / 10) * 1000))));
_animation.RepeatBehavior = RepeatBehavior.Forever;
this.Source = _gifDecoder.Frames[0];
_isInitialized = true;
}
static GifImage()
{
VisibilityProperty.OverrideMetadata(typeof (GifImage),
new FrameworkPropertyMetadata(VisibilityPropertyChanged));
}
private static void VisibilityPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if ((Visibility)e.NewValue == Visibility.Visible)
{
((GifImage)sender).StartAnimation();
}
else
{
((GifImage)sender).StopAnimation();
}
}
public static readonly DependencyProperty FrameIndexProperty =
DependencyProperty.Register("FrameIndex", typeof(int), typeof(GifImage), new UIPropertyMetadata(0, new PropertyChangedCallback(ChangingFrameIndex)));
static void ChangingFrameIndex(DependencyObject obj, DependencyPropertyChangedEventArgs ev)
{
var gifImage = obj as GifImage;
gifImage.Source = gifImage._gifDecoder.Frames[(int)ev.NewValue];
}
/// <summary>
/// Defines whether the animation starts on it's own
/// </summary>
public bool AutoStart
{
get { return (bool)GetValue(AutoStartProperty); }
set { SetValue(AutoStartProperty, value); }
}
public static readonly DependencyProperty AutoStartProperty =
DependencyProperty.Register("AutoStart", typeof(bool), typeof(GifImage), new UIPropertyMetadata(false, AutoStartPropertyChanged));
private static void AutoStartPropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
if ((bool)e.NewValue)
(sender as GifImage).StartAnimation();
}
public string GifSource
{
get { return (string)GetValue(GifSourceProperty); }
set { SetValue(GifSourceProperty, value); }
}
public static readonly DependencyProperty GifSourceProperty =
DependencyProperty.Register("GifSource", typeof(string), typeof(GifImage), new UIPropertyMetadata(string.Empty, GifSourcePropertyChanged));
private static void GifSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
(sender as GifImage).Initialize();
}
/// <summary>
/// Starts the animation
/// </summary>
public void StartAnimation()
{
if (!_isInitialized)
this.Initialize();
BeginAnimation(FrameIndexProperty, _animation);
}
/// <summary>
/// Stops the animation
/// </summary>
public void StopAnimation()
{
BeginAnimation(FrameIndexProperty, null);
}
}
用法示例（XAML）：
<controls:GifImage x:Name="gifImage" Stretch="None" GifSource="/SomeImage.gif" AutoStart="True" />
这个小应用程序怎么样：代码背后：
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>
我也进行了搜索，并在旧的MSDN论坛上的一个帖子中找到了几个不同的解决方案。 （链接不再有效，所以我将其删除）
最简单的执行似乎是使用WinForms PictureBox控件，并且像这样（从线程中改变了一些东西，大部分都是相同的）。
首先在项目中添加对System.Windows.Forms，WindowsFormsIntegration和System.Drawing的引用。
<Window x:Class="GifExample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wfi="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
xmlns:winForms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
Loaded="Window_Loaded" >
<Grid>
<wfi:WindowsFormsHost>
<winForms:PictureBox x:Name="pictureBoxLoading">
</winForms:PictureBox>
</wfi:WindowsFormsHost>
</Grid>
</Window >
然后在Window_Loaded处理程序中，将pictureBoxLoading.ImageLocation属性设置为要显示的图像文件路径。
private void Window_Loaded(object sender, RoutedEventArgs e)
{
pictureBoxLoading.ImageLocation = "../Images/mygif.gif";
}
在该线程中提到了MediaElement控件，但也提到它是一个相当重的控件，所以有许多替代品，包括至少2个基于Image控件的自制控件，所以这是最简单的。
如果你使用<MediaElement>它很简单：
<MediaElement Height="113" HorizontalAlignment="Left" Margin="12,12,0,0"
Name="mediaElement1" VerticalAlignment="Top" Width="198" Source="C:\Users\abc.gif"
LoadedBehavior="Play" Stretch="Fill" SpeedRatio="1" IsMuted="False" />
这是我的动画图像控件版本。您可以使用标准属性Source来指定图像源。我进一步改进了它。我是俄罗斯人，项目是俄语，所以评论也是俄语。但无论如何，你应该能够理解所有内容而不需要评论。 :)
/// <summary>
/// Control the "Images", which supports animated GIF.
/// </summary>
public class AnimatedImage : Image
{
#region Public properties
/// <summary>
/// Gets / sets the number of the current frame.
/// </summary>
public int FrameIndex
{
get { return (int) GetValue(FrameIndexProperty); }
set { SetValue(FrameIndexProperty, value); }
}
/// <summary>
/// Gets / sets the image that will be drawn.
/// </summary>
public new ImageSource Source
{
get { return (ImageSource) GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
#endregion
#region Protected interface
/// <summary>
/// Provides derived classes an opportunity to handle changes to the Source property.
/// </summary>
protected virtual void OnSourceChanged(DependencyPropertyChangedEventArgs aEventArgs)
{
ClearAnimation();
BitmapImage lBitmapImage = aEventArgs.NewValue as BitmapImage;
if (lBitmapImage == null)
{
ImageSource lImageSource = aEventArgs.NewValue as ImageSource;
base.Source = lImageSource;
return;
}
if (!IsAnimatedGifImage(lBitmapImage))
{
base.Source = lBitmapImage;
return;
}
PrepareAnimation(lBitmapImage);
}
#endregion
#region Private properties
private Int32Animation Animation { get; set; }
private GifBitmapDecoder Decoder { get; set; }
private bool IsAnimationWorking { get; set; }
#endregion
#region Private methods
private void ClearAnimation()
{
if (Animation != null)
{
BeginAnimation(FrameIndexProperty, null);
}
IsAnimationWorking = false;
Animation = null;
Decoder = null;
}
private void PrepareAnimation(BitmapImage aBitmapImage)
{
Debug.Assert(aBitmapImage != null);
if (aBitmapImage.UriSource != null)
{
Decoder = new GifBitmapDecoder(
aBitmapImage.UriSource,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.Default);
}
else
{
aBitmapImage.StreamSource.Position = 0;
Decoder = new GifBitmapDecoder(
aBitmapImage.StreamSource,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.Default);
}
Animation =
new Int32Animation(
0,
Decoder.Frames.Count - 1,
new Duration(
new TimeSpan(
0,
0,
0,
Decoder.Frames.Count / 10,
(int) ((Decoder.Frames.Count / 10.0 - Decoder.Frames.Count / 10) * 1000))))
{
RepeatBehavior = RepeatBehavior.Forever
};
base.Source = Decoder.Frames[0];
BeginAnimation(FrameIndexProperty, Animation);
IsAnimationWorking = true;
}
private bool IsAnimatedGifImage(BitmapImage aBitmapImage)
{
Debug.Assert(aBitmapImage != null);
bool lResult = false;
if (aBitmapImage.UriSource != null)
{
BitmapDecoder lBitmapDecoder = BitmapDecoder.Create(
aBitmapImage.UriSource,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.Default);
lResult = lBitmapDecoder is GifBitmapDecoder;
}
else if (aBitmapImage.StreamSource != null)
{
try
{
long lStreamPosition = aBitmapImage.StreamSource.Position;
aBitmapImage.StreamSource.Position = 0;
GifBitmapDecoder lBitmapDecoder =
new GifBitmapDecoder(
aBitmapImage.StreamSource,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.Default);
lResult = lBitmapDecoder.Frames.Count > 1;
aBitmapImage.StreamSource.Position = lStreamPosition;
}
catch
{
lResult = false;
}
}
return lResult;
}
private static void ChangingFrameIndex
(DependencyObject aObject, DependencyPropertyChangedEventArgs aEventArgs)
{
AnimatedImage lAnimatedImage = aObject as AnimatedImage;
if (lAnimatedImage == null || !lAnimatedImage.IsAnimationWorking)
{
return;
}
int lFrameIndex = (int) aEventArgs.NewValue;
((Image) lAnimatedImage).Source = lAnimatedImage.Decoder.Frames[lFrameIndex];
lAnimatedImage.InvalidateVisual();
}
/// <summary>
/// Handles changes to the Source property.
/// </summary>
private static void OnSourceChanged
(DependencyObject aObject, DependencyPropertyChangedEventArgs aEventArgs)
{
((AnimatedImage) aObject).OnSourceChanged(aEventArgs);
}
#endregion
#region Dependency Properties
/// <summary>
/// FrameIndex Dependency Property
/// </summary>
public static readonly DependencyProperty FrameIndexProperty =
DependencyProperty.Register(
"FrameIndex",
typeof (int),
typeof (AnimatedImage),
new UIPropertyMetadata(0, ChangingFrameIndex));
/// <summary>
/// Source Dependency Property
/// </summary>
public new static readonly DependencyProperty SourceProperty =
DependencyProperty.Register(
"Source",
typeof (ImageSource),
typeof (AnimatedImage),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.AffectsMeasure,
OnSourceChanged));
#endregion
}
我用这个库：http://wpfanimatedgif.codeplex.com/
首先，将库安装到项目中（使用Package Manager控制台）：
PM > Install-Package WpfAnimatedGif
然后，将此代码段用于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" />
...
我希望有所帮助。
基本上与上面相同的PictureBox解决方案，但这次使用代码隐藏在项目中使用嵌入式资源：
在XAML中：
<WindowsFormsHost x:Name="_loadingHost">
<Forms:PictureBox x:Name="_loadingPictureBox"/>
</WindowsFormsHost>
在Code-Behind中：
public partial class ProgressIcon
{
public ProgressIcon()
{
InitializeComponent();
var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("My.Namespace.ProgressIcon.gif");
var image = System.Drawing.Image.FromStream(stream);
Loaded += (s, e) => _loadingPictureBox.Image = image;
}
}
我修改了Mike Eshva的代码，并且我使它更好用。你可以使用1frame jpg png bmp或mutil-frame gif。如果你想绑定一个uri到控件，绑定UriSource属性或你想绑定任何in-绑定Source属性的内存流，它是一个BitmapImage。
/// <summary>
/// Элемент управления "Изображения", поддерживающий анимированные GIF.
/// </summary>
public class AnimatedImage : Image
{
static AnimatedImage()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(AnimatedImage), new FrameworkPropertyMetadata(typeof(AnimatedImage)));
}
#region Public properties
/// <summary>
/// Получает/устанавливает номер текущего кадра.
/// </summary>
public int FrameIndex
{
get { return (int)GetValue(FrameIndexProperty); }
set { SetValue(FrameIndexProperty, value); }
}
/// <summary>
/// Get the BitmapFrame List.
/// </summary>
public List<BitmapFrame> Frames { get; private set; }
/// <summary>
/// Get or set the repeatBehavior of the animation when source is gif formart.This is a dependency object.
/// </summary>
public RepeatBehavior AnimationRepeatBehavior
{
get { return (RepeatBehavior)GetValue(AnimationRepeatBehaviorProperty); }
set { SetValue(AnimationRepeatBehaviorProperty, value); }
}
public new BitmapImage Source
{
get { return (BitmapImage)GetValue(SourceProperty); }
set { SetValue(SourceProperty, value); }
}
public Uri UriSource
{
get { return (Uri)GetValue(UriSourceProperty); }
set { SetValue(UriSourceProperty, value); }
}
#endregion
#region Protected interface
/// <summary>
/// Provides derived classes an opportunity to handle changes to the Source property.
/// </summary>
protected virtual void OnSourceChanged(DependencyPropertyChangedEventArgs e)
{
ClearAnimation();
BitmapImage source;
if (e.NewValue is Uri)
{
source = new BitmapImage();
source.BeginInit();
source.UriSource = e.NewValue as Uri;
source.CacheOption = BitmapCacheOption.OnLoad;
source.EndInit();
}
else if (e.NewValue is BitmapImage)
{
source = e.NewValue as BitmapImage;
}
else
{
return;
}
BitmapDecoder decoder;
if (source.StreamSource != null)
{
decoder = BitmapDecoder.Create(source.StreamSource, BitmapCreateOptions.DelayCreation, BitmapCacheOption.OnLoad);
}
else if (source.UriSource != null)
{
decoder = BitmapDecoder.Create(source.UriSource, BitmapCreateOptions.DelayCreation, BitmapCacheOption.OnLoad);
}
else
{
return;
}
if (decoder.Frames.Count == 1)
{
base.Source = decoder.Frames[0];
return;
}
this.Frames = decoder.Frames.ToList();
PrepareAnimation();
}
#endregion
#region Private properties
private Int32Animation Animation { get; set; }
private bool IsAnimationWorking { get; set; }
#endregion
#region Private methods
private void ClearAnimation()
{
if (Animation != null)
{
BeginAnimation(FrameIndexProperty, null);
}
IsAnimationWorking = false;
Animation = null;
this.Frames = null;
}
private void PrepareAnimation()
{
Animation =
new Int32Animation(
0,
this.Frames.Count - 1,
new Duration(
new TimeSpan(
0,
0,
0,
this.Frames.Count / 10,
(int)((this.Frames.Count / 10.0 - this.Frames.Count / 10) * 1000))))
{
RepeatBehavior = RepeatBehavior.Forever
};
base.Source = this.Frames[0];
BeginAnimation(FrameIndexProperty, Animation);
IsAnimationWorking = true;
}
private static void ChangingFrameIndex
(DependencyObject dp, DependencyPropertyChangedEventArgs e)
{
AnimatedImage animatedImage = dp as AnimatedImage;
if (animatedImage == null || !animatedImage.IsAnimationWorking)
{
return;
}
int frameIndex = (int)e.NewValue;
((Image)animatedImage).Source = animatedImage.Frames[frameIndex];
animatedImage.InvalidateVisual();
}
/// <summary>
/// Handles changes to the Source property.
/// </summary>
private static void OnSourceChanged
(DependencyObject dp, DependencyPropertyChangedEventArgs e)
{
((AnimatedImage)dp).OnSourceChanged(e);
}
#endregion
#region Dependency Properties
/// <summary>
/// FrameIndex Dependency Property
/// </summary>
public static readonly DependencyProperty FrameIndexProperty =
DependencyProperty.Register(
"FrameIndex",
typeof(int),
typeof(AnimatedImage),
new UIPropertyMetadata(0, ChangingFrameIndex));
/// <summary>
/// Source Dependency Property
/// </summary>
public new static readonly DependencyProperty SourceProperty =
DependencyProperty.Register(
"Source",
typeof(BitmapImage),
typeof(AnimatedImage),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.AffectsMeasure,
OnSourceChanged));
/// <summary>
/// AnimationRepeatBehavior Dependency Property
/// </summary>
public static readonly DependencyProperty AnimationRepeatBehaviorProperty =
DependencyProperty.Register(
"AnimationRepeatBehavior",
typeof(RepeatBehavior),
typeof(AnimatedImage),
new PropertyMetadata(null));
public static readonly DependencyProperty UriSourceProperty =
DependencyProperty.Register(
"UriSource",
typeof(Uri),
typeof(AnimatedImage),
new FrameworkPropertyMetadata(
null,
FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.AffectsMeasure,
OnSourceChanged));
#endregion
}
这是一个自定义控件。您需要在WPF App Project中创建它，并删除样式中的模板覆盖。