TreeView 控件节点上下移动

#region 下移
private void tsmiDownNode_Click(object sender, EventArgs e)
{
     TreeNode trNode = treeRegion.SelectedNode;       

     TreeNode nextNode = trNode.NextNode;
     if (nextNode == null)   //下一个节点为Null时返回
     {
        return;
     }

     TreeNode NewNode = (TreeNode)trNode.Clone();
     trNode.Parent.Nodes.Insert(nextNode.Index + 1, NewNode);
     trNode.Remove();

     treeRegion.SelectedNode = NewNode;

}
#endregion

#region 上移
private void tsmiUpNode_Click(object sender, EventArgs e)
{
  TreeNode trNode = treeRegion.SelectedNode;
  TreeNode preNode = trNode.PrevNode;
  if (preNode == null)  //选中节点的上一个节点为Null则返回
  {
     return;
  }
  TreeNode NewNode = (TreeNode)trNode.Clone();
  trNode.Parent.Nodes.Insert(preNode.Index, NewNode);
  trNode.Remove();
  treeRegion.SelectedNode = NewNode; 
}
#endregion

  不保存数据只是移动；如果需要保存到数据库需要自己添加保存数据的代码

 

//拖动节点上下移动

 #region 拖动上下移动节点
        //拖动
        private void treeRegion_ItemDrag(object sender, ItemDragEventArgs e)//左键拖动
        {
            if (e.Button == MouseButtons.Left)
            {
               TreeNode node = treeRegion.SelectedNode;