在silverlight中实现Marquee效果

      今天在网上看到了这样一篇文章：
      Silverlight With Java Script Tutorial 12 - Silverlight Marquee Text
   
      教你实现Marquee效果，其主要代码是对StoryBoard的使用，本人在原文其中上又加了“向右，
向上，向下”滚动文字的效果（当然也可以滚动图片）。

      下面就是其演示效果(silverlight2 beta2):

   
      其xaml代码如下:
   

<Canvas xmlns="http://schemas.microsoft.com/client/2007"  
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Canvas.Triggers>
       <EventTrigger RoutedEvent="Canvas.Loaded" >
           <BeginStoryboard>
               <Storyboard x:Name="animation" RepeatBehavior="Forever" >
                   <DoubleAnimation Storyboard.TargetName="ScrollingRight"
                   Storyboard.TargetProperty="(Canvas.Left)"  From="10" To="360" Duration="0:0:10"  />
                   <DoubleAnimation Storyboard.TargetName="ScrollingLeft"
                   Storyboard.TargetProperty="(Canvas.Left)" From="360" To="-100" Duration="0:0:10"  />
                   <DoubleAnimation Storyboard.TargetName="ScrollingUp"
                   Storyboard.TargetProperty="(Canvas.Top)" From="300" To="-60" Duration="0:0:10"  />
                   <DoubleAnimation Storyboard.TargetName="ScrollingDown"
                   Storyboard.TargetProperty="(Canvas.Top)" From="-30" To="360" Duration="0:0:10"  />
               </Storyboard>
           </BeginStoryboard>
       </EventTrigger>
   </Canvas.Triggers>

   <TextBlock x:Name="ScrollingRight" FontFamily="Comic Sans MS" FontSize="36" Foreground="Green" 
                  Text="向右" Canvas.Top="0" />
   <TextBlock x:Name="ScrollingLeft" FontFamily="Comic Sans MS" FontSize="36" Foreground="Red"
                  Text="向左" Canvas.Top="50"/>     
   <TextBlock x:Name="ScrollingUp" FontFamily="Comic Sans MS" FontSize="36" Foreground="Blue"
                  Text="向上" Canvas.Left="80" /> 
   <TextBlock x:Name="ScrollingDown" FontFamily="Comic Sans MS" FontSize="36" Foreground="Black"
                  Text="向下" Canvas.Left="200" /> 
</Canvas>