試圖在WPF中學習動畫與CompositionTarget.Rendering

Question

我想弄清楚如何使用VB.NET動畫/移動WPF中的元素。有人建議我嘗試使用CompositionTarget.Rendering，但我很難入門。下面是我的代碼，下面是我收到的錯誤消息。有人可以告訴我我哪裏去錯了。

代碼：

Imports System.ComponentModel 

Class MainWindow 

    Dim flake0 As New flake 

    Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded 
     canvas1.DataContext = flake0 
     AddHandler CompositionTarget.Rendering, AddressOf compo 
    End Sub 

    Private Sub compo(ByVal sender As Object, ByVal e As EventArgs) 
     flake0.move() 
    End Sub 
End Class 

錯誤：

Handles clause requires a WithEvents variable defined in the containing type or one of its base types 

Answer 1

我有另一種方法，意外地得到了 「處理CompositionTarget.Rendering」 標記，以它的結束。