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);

 

}

 

}

 

}

 

}