Asp.net 树视图 - 单击同一节点时不会触发事件

发布于 2024-11-01 08:15:03 字数 158 浏览 4 评论 0原文

有没有办法在选择节点两次时引发 SelectedNodeChanged 事件。我无法使用代码“treeview.SelectedNode.Selected = false”，因为我必须显示树的选定节点，但同时，我想要一些事件，以便我可以捕获节点上的点击。有什么办法可以做到吗？

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暮年 2024-11-08 08:15:03

您可以做的是将代码放在另一个事件中，例如预渲染，您可以通过布尔类变量（例如 blnIsChanged）来确定选择是否已更改。该值的默认值 false 仅在 SelectedNodeChanged 事件中设置为 true，因此您可以在预渲染（或在 SelectedNodeChanged 事件之后触发的任何事件）中使用 if 语句，如果 blnIsChanged = false 并执行该操作，则可以执行您的代码如果它 = true 则什么也没有。

例子：

Partial Class YourPageWithaAtreeView  
    Inherits System.Web.UI.Page  
Dim _blnSelectionChanged as Boolean = false



Protected Sub MyTree_SelectedNodeChanged(byval sender as object, byval e as eventargs) handles MyTree.SelectedNodeChanged  
   _blnSelectionChanged = true //The selection changed
End Sub
Protected Sub MyTree_PreRender(byval sender as object, byval e as eventargs) handles MyTree.PreRender
    if _blnSelectionChanged = false Then
      //Because the boolean is not true that means that 
      //the selected node didn't change
      //insert the code you want to execute when the user
      //clicks the already selected node
    end if
End Sub

What you could do is put the code in another event like the prerender and you can determine if the selection has changed by having a boolean class variable, blnIsChanged for example. This value has the default value of false is only set to true in the SelectedNodeChanged event so you can have an if statement in the prerender (or any event that would fire after the SelectedNodeChanged event) that can execute your code if blnIsChanged = false and do nothing if it = true.

Example:

Partial Class YourPageWithaAtreeView  
    Inherits System.Web.UI.Page  
Dim _blnSelectionChanged as Boolean = false



Protected Sub MyTree_SelectedNodeChanged(byval sender as object, byval e as eventargs) handles MyTree.SelectedNodeChanged  
   _blnSelectionChanged = true //The selection changed
End Sub
Protected Sub MyTree_PreRender(byval sender as object, byval e as eventargs) handles MyTree.PreRender
    if _blnSelectionChanged = false Then
      //Because the boolean is not true that means that 
      //the selected node didn't change
      //insert the code you want to execute when the user
      //clicks the already selected node
    end if
End Sub

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