WPF删除DropShadow效果

Question

现在，如果我单击按钮A，则按钮B会显示一个DropShadow效果：

 Private Sub ButtonA_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles ButtonA.Click

 Dim objDropShadow As New DropShadowEffect
            objDropShadow.ShadowDepth = 0
            objDropShadow.BlurRadius = 30
            objDropShadow.Color = Colors.GreenYellow

            Me.ButtonB.Effect = objDropShadow

End Sub

如果单击按钮C，如何删除按钮B的DropShadow效果？

Answer 1

试试吧

Me.ButtonB.Effect = Nothing        // VB.Net
this.ButtonB.Effect = null;        // C#

Answer 2

Private Sub ButtonC_Click(
  ByVal sender As System.Object, 
  ByVal e As System.Windows.RoutedEventArgs) Handles ButtonC.Click

 Dim objDropShadow As New DropShadowEffect
            objDropShadow.ShadowDepth = 0
            objDropShadow.BlurRadius = 0
            objDropShadow.Color = Colors.Transparent

            Me.ButtonB.Effect = objDropShadow

End Sub