using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication1{ public partial class Form1 : Form { public Form1() { InitializeComponent(); treeView1.AllowDrop = true; treeView1.ItemDrag += new ItemDragEventHandler(treeView1_ItemDrag); treeView1.DragEnter += new DragEventHandler(treeView1_DragEnter); treeView1.DragDrop += new DragEventHandler(treeView1_DragDrop); } void treeView1_DragDrop(object sender, DragEventArgs e) { TreeNode moveNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode"); //根据鼠标坐标确定要移动到的目标节点 Point pt; TreeNode targeNode; pt = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y)); targeNode = this.treeView1.GetNodeAt(pt); //如果目标节点无子节点则添加为同级节点,反之添加到下级节点的未端 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); } //更新当前拖动的节点选择 treeView1.SelectedNode = NewMoveNode; //展开目标节点,便于显示拖放效果 targeNode.Expand(); //移除拖放的节点 moveNode.Remove(); } void treeView1_DragEnter(object sender, DragEventArgs e) { if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode")) { e.Effect = DragDropEffects.Move; } else { e.Effect = DragDropEffects.None; } } void treeView1_ItemDrag(object sender, ItemDragEventArgs e) { if (e.Button == MouseButtons.Left) { DoDragDrop(e.Item, DragDropEffects.Move); } } private void Form1_Load(object sender, EventArgs e) { treeView1.LabelEdit = true;//可编辑状态。 //添加一个节点,这个结点是根节点。 TreeNode node = new TreeNode(); node.Text = "hope"; treeView1.Nodes.Add(node); TreeNode node1 = new TreeNode(); node1.Text = "hopeone"; TreeNode node11 = new TreeNode(); node11.Text = "hopeoneone"; TreeNode node2 = new TreeNode(); node2.Text = "hopetwo"; node1.Nodes.Add(node11);//在node1下面在添加一个结点。 node.Nodes.Add(node1);//node下的两个子节点。 node.Nodes.Add(node2); TreeNode t = new TreeNode("basil");//作为根节点。 treeView1.Nodes.Add(t); TreeNode t1 = new TreeNode("basilone"); t.Nodes.Add(t1); TreeNode t2 = new TreeNode("basiltwo"); t.Nodes.Add(t2); } }}
本文转自莫水千流博客园博客,原文链接:http://www.cnblogs.com/zhoug2020/p/5716950.html,如需转载请自行联系原作者