TreeView(递归)

很简单，不多说
最终效果：

数据库(Access):

代码：

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > 无标题页 </ title >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
         < div  style ="text-align:center;" >
             < div  style ="margin:5px; float:left;" >< asp:TreeView  runat ="server"  ID ="Tree1" ></ asp:TreeView ></ div >
             < div  style ="margin-left:12px;" >< asp:GridView  runat ="server"  ID ="GridView1" ></ asp:GridView ></ div >
         </ div >  
     </ form >
</ body >
</ html >

public   partial   class  InfoSort : System.Web.UI.Page
     {
        DataSet ds = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindData();
                loadtree();
            }
        }
        private void loadtree()
        {
            Tree1.Nodes.Clear();
            ds = GetDataSet("SELECT * FROM sort");
            InitTree(Tree1.Nodes, 0);
        }
        private void InitTree(TreeNodeCollection Nds,int parentid)
        {
            DataView dv = new DataView();
            TreeNode tmpNd = null;
            dv.Table = ds.Tables[0];
            dv.RowFilter = String.Format("parentid={0}", parentid);
            foreach (DataRowView drv in dv)
            {
                tmpNd = new TreeNode();
                tmpNd.Text = (string)drv["sortname"];//节点名称
                tmpNd.NavigateUrl = String.Format("?id={0}", drv["id"]);//节点URL
                //tmpNd.ImageUrl = ""; //节点图片
                if (parentid == 0)
                    tmpNd.Expanded = true;
                else
                    tmpNd.Expanded = false;
                Nds.Add(tmpNd);
                InitTree(Nds[Nds.Count - 1].ChildNodes, (int)drv["id"]);
            }
        }
        private void BindData()
        {
            GridView1.DataSource = GetDataSet("select * from sort");
            GridView1.DataBind();
        }

        Dal#region Dal
        private OleDbConnection GetConn
        {
            get
            {
                string path = Server.MapPath("App_Data/Database2.mdb");
                string _connStr = String.Format("Provider=Microsoft.Jet.OLEDB.4.0; Data Source={0}", path);
                return new OleDbConnection(_connStr);
            }
        }
        private DataSet GetDataSet(string sql)
        {
            OleDbConnection _conn = null;
            OleDbDataAdapter odda = null;
            DataSet ds = null;
            try
            {
                ds = new DataSet();
                _conn = GetConn;
                _conn.Open();
                odda = new OleDbDataAdapter(sql, GetConn);
                odda.Fill(ds);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                if (odda != null)
                    odda.Dispose();
                if (_conn != null)
                {
                    _conn.Close();
                    _conn.Dispose();
                }
            }
            return ds;
        }
        #endregion
    }