form1.cs

这是.net2005学习不可缺少的教程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DragTree
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode ParentNode1;
            TreeNode ParentNode2;

            ParentNode1 = treeView1.Nodes.Add("tv1");
            ParentNode1.Nodes.Add("tv1FirstChild");
            ParentNode1.Nodes.Add("tv1SecondChild");
            ParentNode1.Nodes.Add("tv1ThirdChild");
            ParentNode1.Nodes.Add("tv1FourthChild");
            ParentNode1.Expand();

            ParentNode2 = treeView2.Nodes.Add("tv2");
            ParentNode2.Nodes.Add("tv2FirstChild");
            ParentNode2.Nodes.Add("tv2SecondChild");
            ParentNode2.Expand();

        }

        private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            DoDragDrop(e.Item, DragDropEffects.Move);
        }

        private void treeView2_ItemDrag(object sender, ItemDragEventArgs e)
        {
            DoDragDrop(e.Item, DragDropEffects.Move);
        }

        private void treeView1_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Move;
        }

        private void treeView2_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = DragDropEffects.Move;
        }

        private void treeView1_DragDrop(object sender, DragEventArgs e)
        {
            TreeNode NewNode;

            if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false))
            {
                Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
                TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(pt);
                NewNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");

                DestinationNode.Nodes.Add((TreeNode)NewNode.Clone());
                DestinationNode.Expand();
                //Remove Original Node
                NewNode.Remove();

            }

        }

        private void treeView2_DragDrop(object sender, DragEventArgs e)
        {
            TreeNode NewNode;

            if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false))
            {
                Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
                TreeNode DestinationNode = ((TreeView)sender).GetNodeAt(pt);
                NewNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");

                DestinationNode.Nodes.Add((TreeNode)NewNode.Clone());
                DestinationNode.Expand();
                //Remove Original Node
                NewNode.Remove();
            }

        }
    }
}