用后台代码创建Storyboard

 string storyboardName = "MyStoryBoard";
 string myXamlElement = "MyXamlElement";
 int newLeftPosition = 120;
             Storyboard sb = XamlReader.Load(String.Format(
 @"<Storyboard xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"" x:Name=""{0}"">
                 <DoubleAnimation Storyboard.TargetName=""{1}""
                 Storyboard.TargetProperty=""(Canvas.Left)""
                 To=""{2}"" Duration=""00:00:00.1200000""/>
                 </Storyboard>", storyboardName, myXamlElement, newLeftPosition)) as Storyboard;
 //Add a delegate to remove the storyboard from resources as soon as it is finished. 
             sb.Completed += new EventHandler(sb_Completed);
 //Add to the resources of the page 
  this.Resources.Add(sb);
 //Begin the storyboard which will animate the element to the correct position. 
             sb.Begin();