如何上下移动listBox中的项目?

问题描述

我有一个 listBox1 对象，它包含一些项目.我有一个按钮可以向上移动所选项目，另一个可以向下移动所选项目.这两个按钮的代码应该是什么?

I have a listBox1 object and it contains some items. I have a button to move selected item up and another to move selected item down. What should the code be to the two buttons?

推荐答案

private void UpClick()
{
    // only if the first item isn't the current one
    if(listBox1.ListIndex > 0)
    {
        // add a duplicate item up in the listbox
        listBox1.AddItem(listBox1.Text, listBox1.ListIndex - 1);
        // make it the current item
        listBox1.ListIndex = (listBox1.ListIndex - 2);
        // delete the old occurrence of this item
        listBox1.RemoveItem(listBox1.ListIndex + 2);
    }
}

private void DownClick()
{
   // only if the last item isn't the current one
   if((listBox1.ListIndex != -1) && (listBox1.ListIndex < listBox1.ListCount - 1))
   {
      // add a duplicate item down in the listbox
      listBox1.AddItem(listBox1.Text, listBox1.ListIndex + 2);
      // make it the current item
      listBox1.ListIndex = listBox1.ListIndex + 2;
      // delete the old occurrence of this item
      listBox1.RemoveItem(listBox1.ListIndex - 2);
   }
}

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