Silverlight不透明動畫不能以編程方式工作

Question

我是Silverlight的新手，並嘗試通過編程方式爲對象的不透明度創建動畫樣本。

我想出用下面的代碼：

 MapShape myTestShape= RadMapInformationLayer.Items[0] as MapShape; 
     SolidColorBrush brush = new SolidColorBrush(); 
     brush.Color = Colors.Purple; 
     myTestShape.Fill = brush; 

     //create a duration object 
     Duration duration = new Duration(TimeSpan.FromSeconds(5)); 

     //create the storyboard 
     Storyboard story = new Storyboard(); 

     //create double animation 
     DoubleAnimation animation = new DoubleAnimation(); 

     //set the duration property 
     animation.Duration = duration; 

     //set the from and too values 
     animation.From = 1.0; 
     animation.To = 0.0; 

     //add the duration to the storyboard 
     story.Duration = duration;    

     //now set the target of the animation 
     Storyboard.SetTarget(animation, myTestShape); 

     //set the target property of this object 
     Storyboard.SetTargetProperty(animation, new PropertyPath(UIElement.OpacityProperty)); 

     //add the double animations to the story board 
     story.Children.Add(animation);    

     if (!LayoutRoot.Resources.Contains("story1")) 
      LayoutRoot.Resources.Add("story1", story); 

     story.Begin(); 

對於屬性路徑我也試過：

1. new PropertyPath("(FrameworkElement.Opacity)") 

2. new PropertyPath("(FrameworkElement.Opacity)") 

3. new PropertyPath("(Control.Opacity)") 

和其他幾個人，我有零運氣這個。

任何人都可以看到我要去哪裏錯了嗎？

感謝， 雅克

Answer 1

我以前做數據綁定到MapShape.FillProperty。

嘗試：

 //create double animation 
     ColorAnimation animation = new ColorAnimation(); 

     //set the duration property 
     animation.Duration = duration; 

     //set the from and too values 
     animation.From = Colors.Purple; 
     animation.To = Colors.Transparent; 

     //add the duration to the storyboard 
     story.Duration = duration; 

     //now set the target of the animation 
     Storyboard.SetTarget(animation, rect); 

     //set the target property of this object 
     Storyboard.SetTargetProperty(animation, new PropertyPath("(MapShape.Fill).Color")); 

編輯：

至於爲什麼你的代碼不能正常工作 - 通過MapShape.SetShapeFillStroke（）來看，似乎Telerik的將不綁定MapShape的不透明度到它的內在原始形狀的不透明度，除非你提供填充。你有在XAML中定義的填充嗎？如果沒有，請嘗試提供一個。否則，也許這個代碼在Shape的生命週期中（在ReadCompleted中或之後）過早定義？

<telerik:InformationLayer x:Name="StateLayer"> 
    <telerik:InformationLayer.Reader> 
     ... 
    </telerik:InformationLayer.Reader> 
    <telerik:InformationLayer.ShapeFill> 
     <telerik:MapShapeFill Fill="{StaticResource CommonBackgroundLightBrush}" Stroke="#5A636B" StrokeThickness="1" /> 
    </telerik:InformationLayer.ShapeFill>