Canvas.Left是一个附加依赖项属性的示例。 C＃的语法为：

The "Canvas.Left" is an example of attached dependency property. The syntax for the C# is:

Canvas.SetLeft(myStackPanel, 50);

myStackPanel是必须在xaml中使用x.Name分配的任何自定义名称。

Where myStackPanel is any custom name you must assign using x.Name in the xaml.