如何禁用silverlight列表框的向上和向下箭頭鍵？

我想在Silverlight中按下向上和向下箭頭鍵禁用導航。如何禁用silverlight列表框的向上和向下箭頭鍵？

我試圖用一個case語句：

void lisBox_KeyUp(object sender, System.Windows.Input.KeyEventArgs e) 
    { 
     int numberofItems = lisBox.Items.Count-1; 
     Keys key = (Keys)e.Key; 
     switch (key) 
     { 
      case Keys.LEFT: 
       if (lisBox.SelectedIndex > 0) 
       { 
        lisBox.SelectedIndex = lisBox.SelectedIndex - 1; 
       } 
       break; 
      case Keys.RIGHT: 

       if (lisBox.SelectedIndex < numberofItems) 
       { 
        lisBox.SelectedIndex = lisBox.SelectedIndex + 1; 
       } 
       break; 
      case Keys.UP: 
       e.Handled = true; 
       lisBox.SelectedIndex = lisBox.SelectedIndex - 4; 
       break; 
      case Keys.DOWN: 
        e.Handled = true; 
       lisBox.SelectedIndex = lisBox.SelectedIndex - 4; 
       break; 
     } 

    }

這不是日夜不停:(幫助

來源

2010-03-26 Simsons