在C#中实现TreeView节点的拖放操作

//从TreeView2控件中,拖放节点到TreeView1中

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace TreeViewDrap

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void treeView1_DragEnter(object sender, DragEventArgs e)

{

if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode"))

{

e.Effect = DragDropEffects.Copy;

}

else

{

e.Effect = DragDropEffects.None;

}

}

private void Form1_Load(object sender, EventArgs e)

{

this.treeView1.AllowDrop = true;

this.treeView2.AllowDrop = true;

this.treeView2.ExpandAll();

this.treeView1.ExpandAll();

}

private void treeView1_DragDrop(object sender, DragEventArgs e)

{

TreeNode TempNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");

if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode", false))

{

Point pt;

TreeNode DestNode;

pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));

DestNode = ((TreeView)sender).GetNodeAt(pt);

if (DestNode.TreeView != TempNode.TreeView)

{

DestNode.Nodes.Add((TreeNode)TempNode.Clone());

DestNode.Expand();

}

}

}

private void treeView2_ItemDrag(object sender, ItemDragEventArgs e)

{

int itemIndex;

itemIndex = this.treeView2.SelectedNode.Index;

if (itemIndex >= 0)

{

treeView2.DoDragDrop(treeView2.SelectedNode, DragDropEffects.Copy);

}

}

}

}