.net C# Treeview的Node拖动，Node节点上下移动

定义一个TreeView 名字为TVdepartment,设置allowdrop为True


//移动代码




private void MiMoveUp_Click(object sender, EventArgs e) //向上移动




...{


//by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.10


TreeNode Node = TVdepartment.SelectedNode;


TreeNode PrevNode = Node.PrevNode;


if (PrevNode != null)




...{




TreeNode NewNode = (TreeNode)Node.Clone();


if (Node.Parent == null)




...{


TVdepartment.Nodes.Insert(PrevNode.Index, NewNode);


}


else




...{


Node.Parent.Nodes.Insert(PrevNode.Index, NewNode);


}


Node.Remove();


TVdepartment.SelectedNode = NewNode;






}






}


private void MiMoveDown_Click(object sender, EventArgs e)//向下移动




...{


//by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.10


TreeNode Node = TVdepartment.SelectedNode;


TreeNode NextNode = Node.NextNode;


if (NextNode != null)




...{




TreeNode NewNode = (TreeNode)Node.Clone();


if (Node.Parent == null)




...{


TVdepartment.Nodes.Insert(NextNode.Index + 1, NewNode);


}


else




...{


Node.Parent.Nodes.Insert(NextNode.Index + 1, NewNode);


}


Node.Remove();


TVdepartment.SelectedNode = NewNode;






}


}


//拖动代码


private void TVdepartment_ItemDrag(object sender, ItemDragEventArgs e)//左键拖动




...{


if (e.Button == MouseButtons.Left)




...{


DoDragDrop(e.Item, DragDropEffects.Move);


}




}




private void TVdepartment_DragEnter(object sender, DragEventArgs e)




...{


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




...{


e.Effect = DragDropEffects.Move;


}


else




...{


e.Effect = DragDropEffects.None;


}




}




private void TVdepartment_DragDrop(object sender, DragEventArgs e)//拖动




...{


//by 闫磊 Email:Landgis@126.com,yanleigis@21cn.com 2007.10.10


//获得拖放中的节点


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.TVdepartment.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


TVdepartment.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();






}