asp.net Treeview节点保存成XML文件

递归treeview的节点，并保存成XML文件，让treeview无限级分类读取节点速度比较快

//生成XML文件 

using System.Xml;

protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            Init_Tree();
            save();
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "ajaxjs", "alert('前台产品分类更新成功！')", true);
            Button1.Enabled = false;
        }
        catch (Exception ex)
        {
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "ajaxjs", "alert('前台产品分类更新失败！')", true);
        }
     
    }

XmlDocument doc = new XmlDocument();
    //遍历XML根节点
    private void save()
    {
       // XmlTextWriter objXml = new XmlTextWriter(Server.MapPath("../XMLTest.xml"), null);
        doc.LoadXml("<XMLTest></XMLTest>");
        XmlNode root = doc.SelectSingleNode("XMLTest");
        foreach (TreeNode tn in TreeView_Tree.Nodes)
        {
            XmlElement Test = doc.CreateElement("treenode");
            XmlAttribute cid = doc.CreateAttribute("cid");
            cid.InnerText = tn.Value;
            Test.SetAttributeNode(cid);
            XmlAttribute treenodename = doc.CreateAttribute("name");
            treenodename.InnerText = tn.Text;
            Test.SetAttributeNode(treenodename);
            XmlAttribute treenodeUrl = doc.CreateAttribute("url");
            treenodeUrl.InnerText = tn.NavigateUrl;
            Test.SetAttributeNode(treenodeUrl);
            root.AppendChild(Test);
            if (tn.ChildNodes != null)
            {
                ChildNods(tn, Test);
            }
        }
       doc.Save(Server.MapPath("../XMLTest.xml"));
    }
    //遍历XML子节点
    private void ChildNods(TreeNode ParentNode, XmlElement Test)
    {
        foreach (TreeNode tn in ParentNode.ChildNodes)
        {
            XmlElement Ts = doc.CreateElement("treenode");
            XmlAttribute cid = doc.CreateAttribute("cid");
            cid.InnerText = tn.Value;
            Ts.SetAttributeNode(cid);
            XmlAttribute treenode2name = doc.CreateAttribute("name");
            treenode2name.InnerText = tn.Text;
            Ts.SetAttributeNode(treenode2name);
            XmlAttribute treenode2Url = doc.CreateAttribute("url");
            treenode2Url.InnerText = tn.NavigateUrl;
            Ts.SetAttributeNode(treenode2Url);
            Test.AppendChild(Ts);
            if (tn.ChildNodes != null)
            {
                ChildNods(tn, Ts);
            }
        }
    }

    protected void Init_Tree()
    {
        //获取Faq树形目录节点
        string sqlstr = "select * from Content_Class order by ClassOrder asc,cid desc";
        DataSet DataSet_Tree = access_sql.GreatDs(sqlstr);
        this.ViewState["DataSet_Tree"] = DataSet_Tree;
        //调用递归函数，完成树形结构的生成
        AddTree("0", (TreeNode)null);
    }
    //递归添加树的节点 参数ParentID为树的最大父结点
    public void AddTree(string ParentID, TreeNode pNode)
    {

        DataSet DataSet_Tree = (DataSet)this.ViewState["DataSet_Tree"];
        DataView DataView_Tree = new DataView(DataSet_Tree.Tables[0]);
        //过滤ParentID,得到当前的所有子节点 ParentID为父节点ID
        DataView_Tree.RowFilter = " ClassPre= '" + ParentID + "' ";
        DataView_Tree.Sort = " ClassOrder ASC ";
        //循环递归

        foreach (DataRowView Row in DataView_Tree)
        {

            //声明节点
            TreeNode Node = new TreeNode();
            //绑定超级链接
            // Node.NavigateUrl = baseinfo.Getpclassurl(Row["classname"].ToString(), Row["cid"].ToString());
            string classname = access_sql.GetOneValue("select ClassName from Content_Class where cID=" + Row["cid"].ToString());
            Node.NavigateUrl = baseinfo.Getpclassurl(classname, Row["cid"].ToString());

 

            bool flag = false;

            //开始递归      
            if (pNode == null)
            {
                //添加根节点
                Node.Text = Row["classname"].ToString();
                Node.Value = Row["cid"].ToString();
                TreeView_Tree.Nodes.Add(Node);
                Node.Expanded = flag; //节点状态闭
                AddTree(Row["ClassId"].ToString(), Node);    //再次递归
            }
            else
            {
                //添加当前节点的子节点
                Node.Text = Row["classname"].ToString();
                Node.Value = Row["cid"].ToString();
                pNode.ChildNodes.Add(Node);
                Node.Expanded = flag; //节点状态闭
                AddTree(Row["ClassId"].ToString(), Node);     //再次递归
            }
        }

    }