1 public Form1()
2 {
3 InitializeComponent();
4 treeView1.AllowDrop = true;
5 treeView1.ItemDrag += new ItemDragEventHandler(treeView1_ItemDrag);
6 treeView1.DragEnter += new DragEventHandler(treeView1_DragEnter);
7 treeView1.DragDrop += new DragEventHandler(treeView1_DragDrop);
8 }
9 void treeView1_DragDrop(object sender, DragEventArgs e)
10 {
11 TreeNode moveNode = (TreeNode)e.Data.GetData("System.Windows.Forms.TreeNode");
12 //根据鼠标坐标确定要移动到的目标节点
13 Point pt;
14 TreeNode targeNode;
15 pt = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y));
16 targeNode = this.treeView1.GetNodeAt(pt);
17 //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
18 TreeNode NewMoveNode = (TreeNode)moveNode.Clone();
19 if (targeNode.Nodes.Count == 0)
20 {
21 targeNode.Parent.Nodes.Insert(targeNode.Index, NewMoveNode);
22 }
23 else
24 {
25 targeNode.Nodes.Insert(targeNode.Nodes.Count, NewMoveNode);
26 }
27 //更新当前拖动的节点选择
28 treeView1.SelectedNode = NewMoveNode;
29 //展开目标节点,便于显示拖放效果
30 targeNode.Expand();
31 //移除拖放的节点
32 moveNode.Remove();
33 }
34 void treeView1_DragEnter(object sender, DragEventArgs e)
35 {
36 if (e.Data.GetDataPresent("System.Windows.Forms.TreeNode"))
37 {
38 e.Effect = DragDropEffects.Move;
39 }
40 else
41 {
42 e.Effect = DragDropEffects.None;
43 }
44 }
45 void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
46 {
47 if (e.Button == MouseButtons.Left)
48 {
49 DoDragDrop(e.Item, DragDropEffects.Move);
50 }
51 }
