WPF弹出带蒙板的消息框

/// <summary>
/// 弹出消息框
/// </summary>
/// <param name="message">消息</param>
/// <param name="owner">父级窗体</param>
public static void ShowDialog(string message, Window owner)
{
 //蒙板
 Grid layer = new Grid() { Background = new SolidColorBrush(Color.FromArgb(128, 0, 0, 0)) };
 //父级窗体原来的内容
 UIElement original = owner.Content as UIElement;
 owner.Content = null;
 //容器Grid
 Grid container = new Grid();
 container.Children.Add(original);//放入原来的内容
 container.Children.Add(layer);//在上面放一层蒙板
 //将装有原来内容和蒙板的容器赋给父级窗体
 owner.Content = container;

 //弹出消息框
 MessageBox box = new MessageBox() { Owner = owner };
 box.tbc_message.Text = message;
 box.ShowDialog();
}

/// <summary>
/// 窗体关闭事件
/// </summary>
private void Window_Closed(object sender, EventArgs e)
{
 //容器Grid
 Grid grid = this.Owner.Content as Grid;
 //父级窗体原来的内容
 UIElement original = VisualTreeHelper.GetChild(grid, 0) as UIElement;
 //将父级窗体原来的内容在容器Grid中移除
 grid.Children.Remove(original);
 //赋给父级窗体
 this.Owner.Content = original;
}