About treeview control

I have used the mouse down event of the treeview control. And I want to set the selected node as the node on which the mouse down event has h开发者_运维问答appened. How can this problem be resolved?

The MouseDown event is fired before the node is selected. Try handling the AfterSelect event instead. If e.Action is set to TreeViewAction.ByMouse then the event was raised by the mouse.

A couple of options come to mind here. Both might well be overkill, but they still solve the problem.

1. Handle the MouseDown event and use the HitTest method to determine which node the user clicked on. If they clicked on a valid node, manually set the focus to that node via the SelectedNode property.

   private void myTreeView_MouseDown(object sender, MouseEventArgs e)
   {
       if (e.Button == MouseButtons.Right)
       {
           myTreeView.SelectedNode = myTreeView.HitTest(e.Location).Node;
       }
   }
   

2. The bazooka-style solution is to override the WndProc method and listen for WM_RBUTTONDOWN messages. I've done this in my own extended version of the TreeView control because it allows me to fix some really minor stuff that normal, non-obsessive people probably wouldn't notice. I go into excruciating detail in my answer here.

   Basically, you're doing the same thing as the code above does, but at a lower level, which stops the native control from pulling some shenanigans with the focus. I don't remember if they actually apply here (hence the potential overkill), but I'm too lazy to fire up Visual Studio to see for sure.

   public class FixedTreeView : System.Windows.Forms.TreeView
   {
       protected override void WndProc(ref System.Windows.Forms.Message m)
       {
           const int WM_RBUTTONDOWN = 0x204;
           if (m.Msg == WM_RBUTTONDOWN)
           {
               Point mousePos = this.PointToClient(Control.MousePosition);
               this.SelectedNode = this.GetNodeAt(mousePos);
           }
           base.WndProc(ref m);
       }   
   }
   

The first method should work just fine for you. Try that before breaking out bigger weapons.