WPF移除阴影效果

现在，如果单击按钮A，按钮B将显示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，我将如何从按钮B中删除DropShadow效果

试试看

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

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