TreeNode右键选中节点

private void tv_singal_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)//判断你点的是不是右键
            {
                Point ClickPoint = new Point(e.X, e.Y);
                TreeNode CurrentNode = tv_singal.GetNodeAt(ClickPoint);
                if (CurrentNode != null)//判断你点的是不是一个节点
                {
                    tv_singal.SelectedNode = CurrentNode;//选中这个节点
                }
            }
        }