private void dataGrid_MouseRightButtonDown(object sender, MouseButtonEventArgs e)        {            ContextMenu context = new ContextMenu();            MenuItem item = new MenuItem();            item.Header = "点击删除该行数据";            item.Click += new RoutedEventHandler(item_Click);            context.Items.Add(item);             context.IsOpen = true;        }        void item_Click(object sender, RoutedEventArgs e)        {          // do something          }