插入三层treeview代码

  #region treetView加载
        private void treeViewLoad()
        {
            DataView dv = navds.tbSiteKind.AsDataView();

            treeView1.Nodes.Clear();

            //foreach (DataRowView row in dv)
            //{
            //    TreeNode tn = new TreeNode();
            //    tn.Text = row[0].ToString();
            //    treeView1.Nodes.Add(tn);
            //    addChildNode(tn);
            //}

        }

        private void addChildNode(TreeNode tn)
        {
            DataView dvc = navds.site.AsDataView();
            string filt = "siteKind like '%" + tn.Text.ToString()+"'";
            dvc.RowFilter = filt;
            //参考：
            //http://tech.it168.com/KnowledgeBase/Articles/0/5/8/058be1cc2a1e95f0dd1e7f9ac71f9d70.htm
            //http://blog.csdn.net/luols/article/details/5539573

            DataTable dt1 = dvc.ToTable(true, "site");
            foreach (DataRow datav in dt1.Rows)
            {
                TreeNode node = new TreeNode();
                node.Text = datav["site"].ToString();
                //node.Tag=datav["rowid"].ToString();
                tn.Nodes.Add(node);
                addMimNode(node);

            }
        }

        private void addMimNode(TreeNode node)
        {
            DataView dv2 = navds.site.AsDataView();
            string filt2 = "site like '%" + node.Text.ToString() + "'";
            dv2.RowFilter = filt2;
            foreach (DataRowView dvr in dv2)
            {
                TreeNode nd = new TreeNode();
                nd.Text = dvr["cannle"].ToString();
                nd.Tag = dvr["siteurl"].ToString();
                node.Nodes.Add(nd);

            }
        }
        #endregion

插入三层的treeview代码。