在WPF VB.NET中禁用复制/粘贴/剪切

Private Sub TextBox_PreviewKeyDown(sender As Object, e As KeyEventArgs)
    If (Keyboard.Modifiers And ModifierKeys.Control) = ModifierKeys.Control Then
        If e.Key = Key.C Then
            ' 禁用复制功能
            e.Handled = True
        ElseIf e.Key = Key.V Then
            ' 禁用粘贴功能
            e.Handled = True
        ElseIf e.Key = Key.X Then
            ' 禁用剪切功能
            e.Handled = True
        End If
    End If
End Sub

<TextBox PreviewKeyDown="TextBox_PreviewKeyDown" />