Canvas为容器控件，用于定位。
1.基本应用
<Border HorizontalAlignment="Left" VerticalAlignment="Top" BorderBrush="Black" BorderThickness="2"> <Canvas Background="LightBlue" Width="400" Height="400"> <Button Canvas.Top="50">Canvas.Top="50"</Button> <Button Canvas.Bottom="50">Canvas.Bottom="50"</Button> <Button Canvas.Left="50">Canvas.Left="50"</Button> <Button Canvas.Right="50">Canvas.Right="50"</Button> </Canvas> </Border> 
<Canvas> <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="100" Canvas.Left="100" Fill="blue"/> <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="150" Canvas.Left="150" Fill="yellow"/> <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="200" Canvas.Left="200" Fill="green"/> <!-- Reverse the order to illustrate z-index property --> <Rectangle Canvas.ZIndex="1" Width="100" Height="100" Canvas.Top="300" Canvas.Left="200" Fill="green"/> <Rectangle Canvas.ZIndex="3" Width="100" Height="100" Canvas.Top="350" Canvas.Left="150" Fill="yellow"/> <Rectangle Canvas.ZIndex="2" Width="100" Height="100" Canvas.Top="400" Canvas.Left="100" Fill="blue"/> </Canvas>
原文：http://www.cnblogs.com/softwaredeveloper/p/3987948.html