通过检查包含与事件相关的数据的 TreeViewEventArgs 类来确定单击了哪个节点。

Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, _  
ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect  
   ' Determine by checking the Node property of the TreeViewEventArgs.  
   MessageBox.Show(e.Node.Text)  
End Sub  
protected void treeView1_AfterSelect (object sender,
System.Windows.Forms.TreeViewEventArgs e)  
   // Determine by checking the Text property.  
   MessageBox.Show(e.Node.Text);  
private:  
   void treeView1_AfterSelect(System::Object ^  sender,  
      System::Windows::Forms::TreeViewEventArgs ^  e)  
      // Determine by checking the Text property.  
      MessageBox::Show(e->Node->Text);  
或者，可以使用 MouseDown 或 MouseUp 事件的 MouseEventArgs 来获取单击时的 Point 的 X 和 Y 坐标值。 然后，使用 TreeView 控件的 GetNodeAt 方法来确定单击了哪个节点。
TreeView 控件