DataTable 转化成EasyUiTree Json格式

       DataTable dt = new DataTable();
            DataColumn d1 = new DataColumn("id", System.Type.GetType("System.Int32"));
            DataColumn d2 = new DataColumn("text", System.Type.GetType("System.String"));
            DataColumn d3 = new DataColumn("Icon", System.Type.GetType("System.String"));
            DataColumn d4 = new DataColumn("ParentId", System.Type.GetType("System.Int32"));
            DataColumn d5 = new DataColumn("state", System.Type.GetType("System.String"));


            dt.Columns.Add(d1);
            dt.Columns.Add(d2);
            dt.Columns.Add(d3);
            dt.Columns.Add(d4);
            dt.Columns.Add(d5);

           
            DataRow row1 = dt.NewRow();
          
            row1["id"] = 1;
            row1["text"] = "系统管理员";
            row1["Icon"] = "";
            row1["ParentId"] = 0;
            row1["state"] = "open";
            dt.Rows.Add(row1);

            DataRow row2 = dt.NewRow();
            row2["id"] = 2;
            row2["text"] = "用户列表";
            row2["Icon"] = "";
            row2["ParentId"] = 1;
            row2["state"] = "open";
            dt.Rows.Add(row2);
            DataRow row3 = dt.NewRow();
            row3["id"] = 3;
            row3["text"] = "添加用户权限";
            row3["Icon"] = "";
            row3["ParentId"] = 2;
            row3["state"] = "open";
            dt.Rows.Add(row3);

 string sss = TabletoEasyJson(dt, "ParentId", "0", "Id", "text");
            if (sss.Length > 12)
                sss = sss.Substring(12);
            context.Response.Write(sss);

  public static string TabletoEasyJson(DataTable dt, string ParentId, string pvalue, string id, string text)
        {
            StringBuilder sb = new StringBuilder();
            string filter = String.Format(" {0}='{1}' ", ParentId, pvalue);//获取顶级目录;//获取顶级目录);
            DataRow[] drows = dt.Select(filter);
            if (drows.Length < 1)
                return "";
            sb.Append(",\"children\":[");
            foreach (DataRow dr in drows)
            {
                string pcv = dr[id].ToString();
                sb.Append("{");
                sb.AppendFormat("\"id\":\"{0}\",", dr[id].ToString());
                sb.AppendFormat("\"text\":\"{0}\",", dr[text].ToString());
                sb.AppendFormat("\"state\":\"{0}\"",dr["state"].ToString());

                sb.Append(TabletoEasyJson(dt, ParentId, pcv, id, text).TrimEnd(','));
                sb.Append("},");
            }
            if (sb.ToString().EndsWith(","))
            {
                sb.Remove(sb.Length - 1, 1);
            }
            sb.Append("]");
             return sb.ToString();

                
        }