silverlight 子控件相对父控件的位置

silverlight 子控件相对父控件的位置

<Grid x:Name="LayoutRoot" Background="White"

 LayoutUpdated="LayoutRoot_LayoutUpdated"
Loaded="LayoutRoot_Loaded"

MouseMove="MapControl_MouseMove"

MouseWheel="MapControl_MouseWheel"

MouseLeftButtonDown="MapControl_MouseLeftButtonDown"

MouseLeftButtonUp="MapControl_MouseLeftButtonUp" >

  <Canvas x:Name="canvas" HorizontalAlignment="Left" VerticalAlignment="Top">
   
  <TextBlock FontSize="50" Name="text1"></TextBlock>
   
  </Canvas>
  </Grid>

问：canvas相对于LayoutRoot的位置怎么获取啊？谢谢

http://www./html/tips/2011/0116/4915.html

Point pt = canvas.TransformToVisual(LayoutRoot).Transform(new Point());
Point pt = canvas.TransformToVisual(this).Transform(new Point());
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