.net C# Treeview的Node拖動，Node節點上下移動

定義一個TreeView 名字爲TVdepartment,設置allowdrop爲True

//移動代碼

        private void MiMoveUp_Click(object sender, EventArgs e) //向上移動
        {
            //by 閆磊 Email:[email protected],[email protected] 2007.10.10
            TreeNode Node = TVdepartment.SelectedNode;
            TreeNode PrevNode = Node.PrevNode;
            if (PrevNode != null)
            {

                TreeNode NewNode = (TreeNode)Node.Clone();
                if (Node.Parent == null)
                {
                    TVdepartment.Nodes.Insert(PrevNode.Index, NewNode);
                }
                else
                {
                    Node.Parent.Nodes.Insert(PrevNode.Index, NewNode);
                }
                Node.Remove();
                TVdepartment.SelectedNode = NewNode;


            }


        }
        private void MiMoveDown_Click(object sender, EventArgs e)//向下移動
        {
            //by 閆磊 Email:[email protected],[email protected] 2007.10.10
            TreeNode Node = TVdepartment.SelectedNode;
            TreeNode NextNode = Node.NextNode;
            if (NextNode != null)
            {

                TreeNode NewNode = (TreeNode)Node.Clone();
                if (Node.Parent == null)
                {
                    TVdepartment.Nodes.Insert(NextNode.Index + 1, NewNode);
                }
                else
                {
                    Node.Parent.Nodes.Insert(NextNode.Index + 1, NewNode);
                }
                Node.Remove();
                TVdepartment.SelectedNode = NewNode;


            }
        }
        //拖動代碼
        private void TVdepartment_ItemDrag(object sender, ItemDragEventArgs e)//左鍵拖動
        {
            if (e.Button == MouseButtons.Left)
            {
                DoDragDrop(e.Item, DragDropEffects.Move);
            }

        }

        private void TVdepartment_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode"))
            {
                e.Effect = DragDropEffects.Move;
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }

        }

        private void TVdepartment_DragDrop(object sender, DragEventArgs e)//拖動
        {
            //by 閆磊 Email:[email protected],[email protected] 2007.10.10
            //獲得拖放中的節點
            TreeNode moveNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");

            //根據鼠標座標確定要移動到的目標節點
            Point pt;
            TreeNode targeNode;
            pt = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y));
            targeNode = this.TVdepartment.GetNodeAt(pt);

            //如果目標節點無子節點則添加爲同級節點,反之添加到下級節點的未端
            TreeNode NewMoveNode = (TreeNode)moveNode.Clone();
            if (targeNode.Nodes.Count == 0)
            {
                targeNode.Parent.Nodes.Insert(targeNode.Index, NewMoveNode);
            }
            else
            {
                targeNode.Nodes.Insert(targeNode.Nodes.Count, NewMoveNode);
            }
            //更新當前拖動的節點選擇
            TVdepartment.SelectedNode = NewMoveNode;
            //展開目標節點,便於顯示拖放效果
            targeNode.Expand();

            //移除拖放的節點
            moveNode.Remove();


        }