如何在填充列表框时抑制indexchanged事件？ [英] How so suppress the indexchanged event when filling a listbox?

问题描述

您好，



在我的代码中，我使用了listboxes的SelectedIndexChanged事件。我不得不发现，当列表框中填充了它的元素时，这个事件似乎会自动引发。



首先，在填充列表框之后我想要没有选择任何项目。我现在用ctrl.SelectedItem = Nothing做这个，但不知怎的，我觉得这不是很优雅。也许你有一个更好的想法或良好的做法，我可以学习这个。



我的问题的主要关注点是：有没有办法抑制SelectedIndexChanged事件，而列表框还没有填写？那会是什么？



感谢您的任何提示。



亲切的问候

Michael



我的尝试：

Hello,

In my code I'm using the SelectedIndexChanged event of listboxes. I had to find out that this event seems to be automatically raised while the listbox gets filled with it's elements.

First of all, after the listbox has been filled I want to have no item selected. I'm currently doing this with "ctrl.SelectedItem = Nothing", but somehow I have the feeling that's not really elegant. Maybe you have a better idea or good practice I can learn on this.

The main concern of my question is: Is there a way to suppress the SelectedIndexChanged event while the listbox hasn't been filled? Which would that be?

Thank you for any hints.

Kind Regards
Michael

What I have tried:

Private Sub lstServers_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles lstServers.SelectedIndexChanged
      Dim ctrl As ListBox = DirectCast(sender, ListBox)

      ' SelectedItem was set to Nothing beforehand
      If ctrl.SelectedItem IsNot Nothing then
      ... do something ...
      End If
End Sub

推荐答案

您可以从处理程序列表中删除该事件并将其添加回最后：在VB.NET中动态添加和删除事件处理程序 [ ^ ]在填充时有效地禁用它。

You could remove the event from the handlers list and add it back at the end: Add and remove event handlers dynamically in VB.NET[^] That effectively "disables" it while it's being filled.

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