易采站长站为您分析C#实现TreeView节点拖拽的方法,涉及C#针对TreeView节点的动态添加及移除技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了C#实现TreeView节点拖拽的方法。。具体如下：
- 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); }
