C# 递归省市区三级树结构

省市区结构

 

实体

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/// <summary>     /// 行政区     /// </summary>     public class AreaEntity     {         public int Id { get; set; }         /// <summary>         /// 名称         /// </summary>         public string RegionName { get; set; }           /// <summary>         /// 编码         /// </summary>         public string RegionCode { get; set; }           /// <summary>         /// 上级编码         /// </summary>         public string ParentCode { get; set; }           public string Longitude { get; set; }         public string Latitude { get; set; }       }       public class AreaModel     {         /// <summary>         /// 名称         /// </summary>         public string RegionName { get; set; }           /// <summary>         /// 编码         /// </summary>         public string RegionCode { get; set; }           /// <summary>         /// 上级编码         /// </summary>         public string ParentCode { get; set; }           public AreaModel[] Children { get; set; }       }

　C# 代码

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/// <summary> /// 获取所属获取信息 /// </summary> /// <param name="parentCode">所属编码</param> /// <returns>列表</returns> public AreaEntity[] GetAreaModelList(string parentCode) {       StringBuilder strSQL = new StringBuilder();     strSQL.Append(" select * from [dbo].[Area] With(nolock) ");     strSQL.Append(" WHERE  ParentCode=@ParentCode");       var param = new SqlParameter[] {         new SqlParameter("@ParentCode",SqlDbType.VarChar)     };     param[0].Value = parentCode;       AreaEntity[] list = null;     using (var context = new YTODBDbContext())     {         list = context.Database.SqlQuery<AreaEntity>(strSQL.ToString(), param).ToArray();       }     return list;       } /// <summary> /// 生成树的方法 /// </summary> /// <param name="parentCode">所属编码</param> /// <param name="areaModel">信息</param> /// <returns></returns> public AreaModel creatTheTree(string parentCode, AreaModel areaModel) {     AreaEntity[] items = GetAreaModelList(parentCode);     //如果没有字节点了，那就返回空     if (items.Length == 0)         return null;     List<AreaModel> jdList = new List<AreaModel>();     for (int i = 0; i < items.Length; i++)     {         AreaModel jiedian = new AreaModel();         jiedian.RegionName = items[i].RegionName;         jiedian.RegionCode = items[i].RegionCode;         jiedian.ParentCode = items[i].ParentCode;         //递归循环         creatTheTree(items[i].RegionCode.ToString(), jiedian);         jdList.Add(jiedian);     }     areaModel.Children = jdList.ToArray();     return areaModel; }

　　接口调用

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public HttpResponseMessage getAreaInfo(AreaInfoViewModel req) {     //var userinfo = GetCurrentLoginInfo();     //if (userinfo.RoleId != FlagMgr.UnitRole.Type.Agricultural.ToInt())     //{     //    return ResponseError("权限不匹配！");     //}       var AreaModel = _areaService.GetAreaModelList(req.RegionCode);     var tempAreaModel = new AreaModel();     tempAreaModel.RegionName = AreaModel[0].RegionName;     tempAreaModel.RegionCode = AreaModel[0].RegionCode;     tempAreaModel.ParentCode = AreaModel[0].ParentCode;     //递归树结构     var areaModel = _areaService.creatTheTree(req.RegionCode, tempAreaModel);     return ResponseOK<AreaModel>(areaModel); }

　　返回数据

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{     "mStatusCode": 200,     "mStatusDesc": "OK",     "mDataBody": {         "RegionName": "济南市",         "RegionCode": "370100",         "ParentCode": "370000",         "Children": [             {                 "RegionName": "济南市",                 "RegionCode": "370100",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370101",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "历下区",                         "RegionCode": "370102",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "市中区",                         "RegionCode": "370103",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "槐荫区",                         "RegionCode": "370104",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "天桥区",                         "RegionCode": "370105",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "历城区",                         "RegionCode": "370112",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "长清区",                         "RegionCode": "370113",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "平阴县",                         "RegionCode": "370124",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "济阳县",                         "RegionCode": "370125",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "商河县",                         "RegionCode": "370126",                         "ParentCode": "370100",                         "Children": null                     },                     {                         "RegionName": "章丘市",                         "RegionCode": "370181",                         "ParentCode": "370100",                         "Children": null                     }                 ]             },             {                 "RegionName": "青岛市",                 "RegionCode": "370200",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370201",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "市南区",                         "RegionCode": "370202",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "市北区",                         "RegionCode": "370203",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "黄岛区",                         "RegionCode": "370211",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "崂山区",                         "RegionCode": "370212",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "李沧区",                         "RegionCode": "370213",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "城阳区",                         "RegionCode": "370214",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "胶州市",                         "RegionCode": "370281",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "即墨市",                         "RegionCode": "370282",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "平度市",                         "RegionCode": "370283",                         "ParentCode": "370200",                         "Children": null                     },                     {                         "RegionName": "莱西市",                         "RegionCode": "370285",                         "ParentCode": "370200",                         "Children": null                     }                 ]             },             {                 "RegionName": "淄博市",                 "RegionCode": "370300",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370301",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "淄川区",                         "RegionCode": "370302",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "张店区",                         "RegionCode": "370303",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "博山区",                         "RegionCode": "370304",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "临淄区",                         "RegionCode": "370305",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "周村区",                         "RegionCode": "370306",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "桓台县",                         "RegionCode": "370321",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "高青县",                         "RegionCode": "370322",                         "ParentCode": "370300",                         "Children": null                     },                     {                         "RegionName": "沂源县",                         "RegionCode": "370323",                         "ParentCode": "370300",                         "Children": null                     }                 ]             },             {                 "RegionName": "枣庄市",                 "RegionCode": "370400",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370401",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "市中区",                         "RegionCode": "370402",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "薛城区",                         "RegionCode": "370403",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "峄城区",                         "RegionCode": "370404",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "台儿庄区",                         "RegionCode": "370405",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "山亭区",                         "RegionCode": "370406",                         "ParentCode": "370400",                         "Children": null                     },                     {                         "RegionName": "滕州市",                         "RegionCode": "370481",                         "ParentCode": "370400",                         "Children": null                     }                 ]             },             {                 "RegionName": "东营市",                 "RegionCode": "370500",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370501",                         "ParentCode": "370500",                         "Children": null                     },                     {                         "RegionName": "东营区",                         "RegionCode": "370502",                         "ParentCode": "370500",                         "Children": null                     },                     {                         "RegionName": "河口区",                         "RegionCode": "370503",                         "ParentCode": "370500",                         "Children": null                     },                     {                         "RegionName": "垦利县",                         "RegionCode": "370521",                         "ParentCode": "370500",                         "Children": null                     },                     {                         "RegionName": "利津县",                         "RegionCode": "370522",                         "ParentCode": "370500",                         "Children": null                     },                     {                         "RegionName": "广饶县",                         "RegionCode": "370523",                         "ParentCode": "370500",                         "Children": null                     }                 ]             },             {                 "RegionName": "烟台市",                 "RegionCode": "370600",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370601",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "芝罘区",                         "RegionCode": "370602",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "福山区",                         "RegionCode": "370611",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "牟平区",                         "RegionCode": "370612",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "莱山区",                         "RegionCode": "370613",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "长岛县",                         "RegionCode": "370634",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "龙口市",                         "RegionCode": "370681",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "莱阳市",                         "RegionCode": "370682",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "莱州市",                         "RegionCode": "370683",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "蓬莱市",                         "RegionCode": "370684",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "招远市",                         "RegionCode": "370685",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "栖霞市",                         "RegionCode": "370686",                         "ParentCode": "370600",                         "Children": null                     },                     {                         "RegionName": "海阳市",                         "RegionCode": "370687",                         "ParentCode": "370600",                         "Children": null                     }                 ]             },             {                 "RegionName": "潍坊市",                 "RegionCode": "370700",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370701",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "潍城区",                         "RegionCode": "370702",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "寒亭区",                         "RegionCode": "370703",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "坊子区",                         "RegionCode": "370704",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "奎文区",                         "RegionCode": "370705",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "临朐县",                         "RegionCode": "370724",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "昌乐县",                         "RegionCode": "370725",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "青州市",                         "RegionCode": "370781",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "诸城市",                         "RegionCode": "370782",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "寿光市",                         "RegionCode": "370783",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "安丘市",                         "RegionCode": "370784",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "高密市",                         "RegionCode": "370785",                         "ParentCode": "370700",                         "Children": null                     },                     {                         "RegionName": "昌邑市",                         "RegionCode": "370786",                         "ParentCode": "370700",                         "Children": null                     }                 ]             },             {                 "RegionName": "济宁市",                 "RegionCode": "370800",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370801",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "任城区",                         "RegionCode": "370811",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "兖州区",                         "RegionCode": "370812",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "微山县",                         "RegionCode": "370826",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "鱼台县",                         "RegionCode": "370827",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "金乡县",                         "RegionCode": "370828",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "嘉祥县",                         "RegionCode": "370829",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "汶上县",                         "RegionCode": "370830",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "泗水县",                         "RegionCode": "370831",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "梁山县",                         "RegionCode": "370832",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "曲阜市",                         "RegionCode": "370881",                         "ParentCode": "370800",                         "Children": null                     },                     {                         "RegionName": "邹城市",                         "RegionCode": "370883",                         "ParentCode": "370800",                         "Children": null                     }                 ]             },             {                 "RegionName": "泰安市",                 "RegionCode": "370900",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "370901",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "泰山区",                         "RegionCode": "370902",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "岱岳区",                         "RegionCode": "370911",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "宁阳县",                         "RegionCode": "370921",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "东平县",                         "RegionCode": "370923",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "新泰市",                         "RegionCode": "370982",                         "ParentCode": "370900",                         "Children": null                     },                     {                         "RegionName": "肥城市",                         "RegionCode": "370983",                         "ParentCode": "370900",                         "Children": null                     }                 ]             },             {                 "RegionName": "威海市",                 "RegionCode": "371000",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371001",                         "ParentCode": "371000",                         "Children": null                     },                     {                         "RegionName": "环翠区",                         "RegionCode": "371002",                         "ParentCode": "371000",                         "Children": null                     },                     {                         "RegionName": "文登区",                         "RegionCode": "371003",                         "ParentCode": "371000",                         "Children": null                     },                     {                         "RegionName": "荣成市",                         "RegionCode": "371082",                         "ParentCode": "371000",                         "Children": null                     },                     {                         "RegionName": "乳山市",                         "RegionCode": "371083",                         "ParentCode": "371000",                         "Children": null                     }                 ]             },             {                 "RegionName": "日照市",                 "RegionCode": "371100",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371101",                         "ParentCode": "371100",                         "Children": null                     },                     {                         "RegionName": "东港区",                         "RegionCode": "371102",                         "ParentCode": "371100",                         "Children": null                     },                     {                         "RegionName": "岚山区",                         "RegionCode": "371103",                         "ParentCode": "371100",                         "Children": null                     },                     {                         "RegionName": "五莲县",                         "RegionCode": "371121",                         "ParentCode": "371100",                         "Children": null                     },                     {                         "RegionName": "莒县",                         "RegionCode": "371122",                         "ParentCode": "371100",                         "Children": null                     }                 ]             },             {                 "RegionName": "莱芜市",                 "RegionCode": "371200",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371201",                         "ParentCode": "371200",                         "Children": null                     },                     {                         "RegionName": "莱城区",                         "RegionCode": "371202",                         "ParentCode": "371200",                         "Children": null                     },                     {                         "RegionName": "钢城区",                         "RegionCode": "371203",                         "ParentCode": "371200",                         "Children": null                     }                 ]             },             {                 "RegionName": "临沂市",                 "RegionCode": "371300",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371301",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "兰山区",                         "RegionCode": "371302",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "罗庄区",                         "RegionCode": "371311",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "河东区",                         "RegionCode": "371312",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "沂南县",                         "RegionCode": "371321",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "郯城县",                         "RegionCode": "371322",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "沂水县",                         "RegionCode": "371323",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "兰陵县",                         "RegionCode": "371324",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "费县",                         "RegionCode": "371325",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "平邑县",                         "RegionCode": "371326",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "莒南县",                         "RegionCode": "371327",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "蒙阴县",                         "RegionCode": "371328",                         "ParentCode": "371300",                         "Children": null                     },                     {                         "RegionName": "临沭县",                         "RegionCode": "371329",                         "ParentCode": "371300",                         "Children": null                     }                 ]             },             {                 "RegionName": "德州市",                 "RegionCode": "371400",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371401",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "德城区",                         "RegionCode": "371402",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "陵城区",                         "RegionCode": "371403",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "宁津县",                         "RegionCode": "371422",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "庆云县",                         "RegionCode": "371423",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "临邑县",                         "RegionCode": "371424",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "齐河县",                         "RegionCode": "371425",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "平原县",                         "RegionCode": "371426",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "夏津县",                         "RegionCode": "371427",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "武城县",                         "RegionCode": "371428",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "乐陵市",                         "RegionCode": "371481",                         "ParentCode": "371400",                         "Children": null                     },                     {                         "RegionName": "禹城市",                         "RegionCode": "371482",                         "ParentCode": "371400",                         "Children": null                     }                 ]             },             {                 "RegionName": "聊城市",                 "RegionCode": "371500",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371501",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "东昌府区",                         "RegionCode": "371502",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "阳谷县",                         "RegionCode": "371521",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "莘县",                         "RegionCode": "371522",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "茌平县",                         "RegionCode": "371523",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "东阿县",                         "RegionCode": "371524",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "冠县",                         "RegionCode": "371525",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "高唐县",                         "RegionCode": "371526",                         "ParentCode": "371500",                         "Children": null                     },                     {                         "RegionName": "临清市",                         "RegionCode": "371581",                         "ParentCode": "371500",                         "Children": null                     }                 ]             },             {                 "RegionName": "滨州市",                 "RegionCode": "371600",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371601",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "滨城区",                         "RegionCode": "371602",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "沾化区",                         "RegionCode": "371603",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "惠民县",                         "RegionCode": "371621",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "阳信县",                         "RegionCode": "371622",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "无棣县",                         "RegionCode": "371623",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "博兴县",                         "RegionCode": "371625",                         "ParentCode": "371600",                         "Children": null                     },                     {                         "RegionName": "邹平县",                         "RegionCode": "371626",                         "ParentCode": "371600",                         "Children": null                     }                 ]             },             {                 "RegionName": "菏泽市",                 "RegionCode": "371700",                 "ParentCode": "370000",                 "Children": [                     {                         "RegionName": "市辖区",                         "RegionCode": "371701",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "牡丹区",                         "RegionCode": "371702",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "曹县",                         "RegionCode": "371721",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "单县",                         "RegionCode": "371722",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "成武县",                         "RegionCode": "371723",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "巨野县",                         "RegionCode": "371724",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "郓城县",                         "RegionCode": "371725",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "鄄城县",                         "RegionCode": "371726",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "定陶县",                         "RegionCode": "371727",                         "ParentCode": "371700",                         "Children": null                     },                     {                         "RegionName": "东明县",                         "RegionCode": "371728",                         "ParentCode": "371700",                         "Children": null                     }                 ]             }         ]     } }

　　

使用过多的递归出现错误，“System.StackOverflowException”，由于递归数据放在栈里，递归不断的压栈，.NET framework Runtime 就抛出异常。

 递归算法解题的运行效率较低。在递归调用的过程当中系统为每一层的返回点、局部量等开辟了栈来存储。递归次数过多容易造成栈溢出等。