asp.net TreeView與XML三步生成列表樹

剛我在做Tree view 綁定時自己摸索了一下，網上有人說TreeView綁定數據源，用什么遞歸綁定啥的，我不想看了，就自己試著寫了一個
我是這樣做的，如果有什么問題請大神指導，我是菜鳥額..
1:頁面TreeView 叫tvFunction
2:新建 adminFunction.xml
代碼如下:
<?xml version="1.0" encoding="utf-8" ?>
<functions>
  <function name="商品發布" url="~/page/leaves/leave.aspx">
    <subfunction name="添加商品" url="~/page/leaves/leave.aspx">
    </subfunction>
    <subfunction name="添加商品" url="~/page/leaves/leave.aspx">
    </subfunction>
  </function>
  <function name="留言發布" url="~/page/leaves/leave.aspx">
    <subfunction name="添加留言" url="~/page/leaves/leave.aspx">
    </subfunction>
    <subfunction name="修改留言" url="~/page/leaves/leave.aspx">
    </subfunction>
  </function>
</functions>

3：頁面綁定
代碼如下:
/// <summary>
        /// 初始化功能樹結構
        /// </summary>
        private void InitFunction()
        {
            XmlDocument xmldoc = new XmlDocument();
            string xmlPath = "~/adminFunction.xml";
            xmlPath = Server.MapPath(xmlPath);
            xmldoc.Load(xmlPath);
            XmlNode root = xmldoc.DocumentElement;

            foreach (XmlNode node in root.ChildNodes)
            {
                //獲取父節點的信息顯示(輕狂-書生)
                XmlElement x1 = node as XmlElement;
                string name = x1.GetAttribute("name");
                string url = x1.GetAttribute("url");
                TreeNode tn = new TreeNode();
                tn.Text = name;
                tn.NavigateUrl = url;
                foreach (XmlNode subnode in x1.ChildNodes)
                {
                    XmlElement subxmlEmt = subnode as XmlElement;
                    string subname = subxmlEmt.GetAttribute("name");
                    string suburl = subxmlEmt.GetAttribute("url");
                    TreeNode subtn = new TreeNode();
                    subtn.Text = subname;
                    subtn.NavigateUrl = suburl;
                    tn.ChildNodes.Add(subtn);

                }
                tvFunction.Nodes.Add(tn);

            }
        }

4：顯示效果

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