递归循环组织机构

using DBUtility;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;

namespace ReportTool.Handler
{
    /// <summary>
    /// Tree 的摘要说明
    /// </summary>
    public class Tree2 : IHttpHandler
    {
        public DataProvider dataprovider = new DataProvider();
        public Tree2()
        {
            dataprovider.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnString2"].ConnectionString;
        }

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            GetTreeJson(context);
        }
        private void GetTreeJson(HttpContext context)
        {
            DataTable dt = new DataTable();
            var sql = @"
select OUID,ParentOUID,OUCode,OUName,OUShortName from tbl_Base_OUInfo where LEN(oucode) in(5,10,15,20) 
order by LEN(oucode),OrderNo,ParentOUID";
            dt = dataprovider.FillDataTable(sql, CommandType.Text);
            string json = GetArrayJSON(dt);
            context.Response.Write(json.Replace(""OUName"", ""text"").Replace(""OUID"", ""id""));
        }

        private static string GetArrayJSON(DataTable dt)
        {
            var o = DatatableToTreeData(dt);
            return new JavaScriptSerializer().Serialize(o);
        }
        private static object DatatableToTreeData(DataTable dtConvert)
        {
            var list = DatatableToHash(dtConvert);
            var r = new List<Hashtable>();
            Hashtable root = new Hashtable();
            //中国石油
            //root = list.Find(p => p["OUID"].ToString() == "00000000-0000-0000-0000-000000000000");
            //集团公司
            root = list.Find(p => p["OUID"].ToString() == "CCB93E1A-CC22-4120-B99F-62E941CC6E4A".ToLower());
            TreeData(list, root, "CCB93E1A-CC22-4120-B99F-62E941CC6E4A".ToLower());
            r.Add(root);
            return r;
        }
        
        private static Hashtable TreeData(List<Hashtable> list, Hashtable r, string pouid)
        {

            var list1 = list.FindAll(p => p["ParentOUID"].ToString() == pouid);
            if (list1.Count > 0)
            {
                
                //var pitem = r as Hashtable;
                if (!r.ContainsKey("children"))
                r["children"] = new List<Hashtable>();
                var children = r["children"] as List<Hashtable>;

                foreach (var item in list1)
                {
                    TreeData(list, item, item["OUID"].ToString());
                    children.Add(item);
                }
            }
            return r;
        }
        private static List<Hashtable> DatatableToHash(DataTable dtConvert)
        {
            var list = new List<Hashtable>();

            int j;

            foreach (DataRow dr in dtConvert.Rows)
            {
                var item = new Hashtable();
                j = 0;

                foreach (DataColumn dc in dtConvert.Columns)
                {
                    var name = dc.ColumnName;
                    var value = dr[j];

                    item[name] = value;

                    j++;
                }
                list.Add(item);
            }
            return list;
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}