本文实例讲述了C#实现TreeView节点拖拽的方法。分享给大家供大家参考。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);
}
}
希望本文所述对大家的C#程序设计有所帮助。
dy("nrwz");
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