稍长一段之后，我终于有了一些时间来考虑如何继承TreeView的处理所选节点被点击。

After a somewhat lengthy period, I have finally had some time to look into how to subclass the TreeView to handle a Selected Node being clicked.

下面是我的解决方案，它暴露了一个新的事件的 SelectedNodeClicked 您可以从页面或其它地方处理。
（如果需要的话它是一个简单的任务，重构为C＃的）

Here is my solution which exposes a new event SelectedNodeClicked which you can handle from the Page or wherever. (If needed it is a simple task to refactor into C#)

Imports System.Web.UI
Imports System.Web


Public Class MyTreeView
  Inherits System.Web.UI.WebControls.TreeView

  Public Event SelectedNodeClicked As EventHandler

  Private Shared ReadOnly SelectedNodeClickEvent As Object

  Private Const CurrentValuePathState As String = "CurrentValuePath"

  Protected Property CurrentValuePath() As String
    Get
      Return Me.ViewState(CurrentValuePathState)
    End Get
    Set(ByVal value As String)
      Me.ViewState(CurrentValuePathState) = value
    End Set
  End Property

  Friend Sub RaiseSelectedNodeClicked()

    Me.OnSelectedNodeClicked(EventArgs.Empty)

  End Sub

  Protected Overridable Sub OnSelectedNodeClicked(ByVal e As EventArgs)

    RaiseEvent SelectedNodeClicked(Me, e)

  End Sub

  Protected Overrides Sub OnSelectedNodeChanged(ByVal e As System.EventArgs)

    MyBase.OnSelectedNodeChanged(e)

    ' Whenever the Selected Node changed, remember its ValuePath for future reference
    Me.CurrentValuePath = Me.SelectedNode.ValuePath

  End Sub

  Protected Overrides Sub RaisePostBackEvent(ByVal eventArgument As String)

    ' Check if the node that caused the event is the same as the previously selected node
    If Me.SelectedNode IsNot Nothing AndAlso Me.SelectedNode.ValuePath.Equals(Me.CurrentValuePath) Then
      Me.RaiseSelectedNodeClicked()
    End If

    MyBase.RaisePostBackEvent(eventArgument)

  End Sub

End Class