Question

我的表单上有2个列表框，但我只想在两者之间进行单一选择，我该如何处理？

当然，我先尝试过这样做......

Private Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
    ListBox2.ClearSelected()
End Sub

Private Sub ListBox2_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox2.SelectedIndexChanged
    ListBox1.ClearSelected()
End Sub

但是，由于这会导致所选索引被更改，因此它会清除您刚刚选择的内容......

感谢您的帮助！

Answer 1

您可以测试原因选择索引发生变化的原因，如下所示：

private void listBox1_SelectedIndexChanged(object sender, EventArgs e) {
  // If listBox2 focused i.e. user clicked list box2 - do nothing:
  // one should not try to clear list box2 selection
  if (listBox2.Focused)
    return;

  listBox2.ClearSelected();
}

private void listBox2_SelectedIndexChanged(object sender, EventArgs e) {
  // If list box1 is in focus that means that user just have selected itme there;
  // so, do nothing: we shouldn't erase user's selection 
  if (listBox1.Focused)
    return;

  listBox1.ClearSelected();
}

Answer 2

首先，您的问题被标记为C＃，但代码示例是VB。其次，我会在C＃中做到如下：

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    listBox2.SelectedIndexChanged -= new System.EventHandler(this.listBox2_SelectedIndexChanged);
    listBox2.ClearSelected();
    listBox2.SelectedIndexChanged += new System.EventHandler(this.listBox2_SelectedIndexChanged);

}

并对其他事件处理程序执行相同的操作。

多个列表框，一个选择

2 个答案: