.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
{
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
{
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
{
//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();
}