如何动态添加ObjectAnimationUsingKeyFrames
我想实现一个点击按钮时触发一个切换图片的功能。图片被包装在xap文件里面了。
代码如下。

XML code

<Grid x:Name="LayoutRoot" Background="White" Loaded="LayoutRoot_Loaded"><Image Margin="82,112,81,124" Grid.Column="1" x:Name="imgTest">        </Image>        <TextBlock Margin="101,60,108,68" Grid.Column="1" Grid.Row="1" Text="TextBlock" TextWrapping="Wrap" d:LayoutOverrides="Width, Height"/>        <Button  Click="btnShow_Click" x:Name="btnShow" Width="20" Height="20"></Button>        <StackPanel x:Name="MyPanl">            <StackPanel.Resources>                <Storyboard x:Name="MyStory" >                </Storyboard>            </StackPanel.Resources>            </StackPanel></Grid>

C#代码如下

C# code

        private void LayoutRoot_Loaded(object sender, RoutedEventArgs e)        {          BitmapImage bitmapImages = new BitmapImage();            bitmapImages.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.RelativeOrAbsolute);            imgTest.Source = bitmapImages;            BitmapSource source;            ImageSource im;            var keyFrames = new ObjectAnimationUsingKeyFrames();            BitmapImage bitmapImage = new BitmapImage();            bitmapImage.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.RelativeOrAbsolute);            source = bitmapImage;            im = bitmapImage;            //BitmapSource source = bitmapImage;            //DiscreteObjectKeyFrame keyFrame = new DiscreteObjectKeyFrame();            //keyFrame.Value = bitmapImage;            //keyFrame.KeyTime = TimeSpan.FromSeconds(0.2);            keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame            {                Value = im,                KeyTime = new TimeSpan(0, 0, 0, 1)            });            bitmapImage = new BitmapImage            {                UriSource = new Uri("/Test/Te/Dnode2.png", UriKind.RelativeOrAbsolute)            };            //source.ClearValue(Image.SourceProperty);            im = bitmapImage;            //source = bitmapImage;            keyFrames.RepeatBehavior = RepeatBehavior.Forever;            keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame                                        {                                            Value = im,                                            KeyTime = new TimeSpan(0, 0, 0, 1)                                        });            MyStory.Children.Add(keyFrames);            Storyboard.SetTarget(keyFrames, imgTest);            Storyboard.SetTargetProperty(keyFrames, new PropertyPath(Image.SourceProperty));          }        private void btnShow_Click(object sender, RoutedEventArgs e)        {            MyStory.Begin();        }

有几个问题想问一下。
1.如果我在<Storyboard x:Name="MyStory" >
这里设置了 Storyboard.TargetName和Storyboard.TargetProperty 属性是不是代码中设置就可以不写了。
2.我在xaml代码中这样写

XML code

        <StackPanel x:Name="MyPanl">            <StackPanel.Resources>                <Storyboard x:Name="MyStory" >                    <ObjectAnimationUsingKeyFrames  Duration="00:00:00.4"                         RepeatBehavior="Forever" Storyboard.TargetName="imag"                         Storyboard.TargetProperty="Source">                        <DiscreteObjectKeyFrame KeyTime="00:00:00.2" x:Name="Run">                            <DiscreteObjectKeyFrame.Value>                                <BitmapImage UriSource="/Test/Te/Dnode.png"></BitmapImage>                            </DiscreteObjectKeyFrame.Value>                        </DiscreteObjectKeyFrame>                        <DiscreteObjectKeyFrame KeyTime="00:00:00.2" x:Name="Stop">                            <DiscreteObjectKeyFrame.Value>                                <BitmapImage UriSource="/Test/Te/Dnode2.png"></BitmapImage>                            </DiscreteObjectKeyFrame.Value>                        </DiscreteObjectKeyFrame>                    </ObjectAnimationUsingKeyFrames>                </Storyboard>            </StackPanel.Resources>            </StackPanel> 
 

点show的时候可以实现动画。为什么动态添加时不能实现？是不是我的代码有问题。


请各路大神指点一下。快把我搞疯了...




[解决办法]
代码中存在几个问题
1、没有设置ObjectAnimationUsingKeyFrames 的 Duration
2、KeyTime是关键帧的时间，不能设为一样
3、Value应该设置为BitmapImage，而不是ImageSource

修改后的代码：
//BitmapImage bitmapImages = new BitmapImage();
//bitmapImages.UriSource = new Uri("/Test/Te/Dnode.jpg", UriKind.RelativeOrAbsolute);
//imgTest.Source = bitmapImages;


//BitmapSource source;
//ImageSource im;
var keyFrames = new ObjectAnimationUsingKeyFrames();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.UriSource = new Uri("/Test/Te/Dnode.png", UriKind.Relative);
//source = bitmapImage;
//im = bitmapImage;

keyFrames.Duration = new Duration(TimeSpan.FromSeconds(3));
keyFrames.RepeatBehavior = RepeatBehavior.Forever;

//BitmapSource source = bitmapImage;
//DiscreteObjectKeyFrame keyFrame = new DiscreteObjectKeyFrame();
//keyFrame.Value = bitmapImage;
//keyFrame.KeyTime = TimeSpan.FromSeconds(0.2);
keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = bitmapImage,
KeyTime = new TimeSpan(0, 0, 0, 1)
});


BitmapImage bitmapImage2 = new BitmapImage
{
UriSource = new Uri("/Test/Te/Dnode2.png", UriKind.Relative)
};
//source.ClearValue(Image.SourceProperty);
//ImageSource im2 = bitmapImage2;
//source = bitmapImage;

keyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
{
Value = bitmapImage2,
KeyTime = new TimeSpan(0, 0, 0, 2)
});


MyStory.Children.Add(keyFrames);

Storyboard.SetTarget(keyFrames, imgTest);
Storyboard.SetTargetProperty(keyFrames, new PropertyPath(Image.SourceProperty));