C# 遞歸省市區三級樹結構
省市區結構git
實體算法
/// <summary>
/// 行政區
/// </summary>
public class AreaEntity
{
public int Id { get; set; }
/// <summary>
/// 名稱
/// </summary>
public string RegionName { get; set; }
/// <summary>
/// 編碼
/// </summary>
public string RegionCode { get; set; }
/// <summary>
/// 上級編碼
/// </summary>
public string ParentCode { get; set; }
public string Longitude { get; set; }
public string Latitude { get; set; }
}
public class AreaModel
{
/// <summary>
/// 名稱
/// </summary>
public string RegionName { get; set; }
/// <summary>
/// 編碼
/// </summary>
public string RegionCode { get; set; }
/// <summary>
/// 上級編碼
/// </summary>
public string ParentCode { get; set; }
public AreaModel[] Children { get; set; }
}
C# 代碼ui
/// <summary>
/// 獲取所屬獲取信息
/// </summary>
/// <param name="parentCode">所屬編碼</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>
/// 生成樹的方法
/// </summary>
/// <param name="parentCode">所屬編碼</param>
/// <param name="areaModel">信息</param>
/// <returns></returns>
public AreaModel creatTheTree(string parentCode, AreaModel areaModel)
{
AreaEntity[] items = GetAreaModelList(parentCode);
//若是沒有字節點了，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;
//遞歸循環
creatTheTree(items[i].RegionCode.ToString(), jiedian);
jdList.Add(jiedian);
}
areaModel.Children = jdList.ToArray();
return areaModel;
}
接口調用編碼
public HttpResponseMessage getAreaInfo(AreaInfoViewModel req)
{
//var userinfo = GetCurrentLoginInfo();
//if (userinfo.RoleId != FlagMgr.UnitRole.Type.Agricultural.ToInt())
//{
// return ResponseError("權限不匹配！");
//}
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;
//遞歸樹結構
var areaModel = _areaService.creatTheTree(req.RegionCode, tempAreaModel);
return ResponseOK<AreaModel>(areaModel);
}
返回數據spa
{
"mStatusCode": 200,
"mStatusDesc": "OK",
"mDataBody": {
"RegionName": "濟南市",
"RegionCode": "370100",
"ParentCode": "370000",
"Children": [
{
"RegionName": "濟南市",
"RegionCode": "370100",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370101",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "歷下區",
"RegionCode": "370102",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "市中區",
"RegionCode": "370103",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "槐蔭區",
"RegionCode": "370104",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "天橋區",
"RegionCode": "370105",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "歷城區",
"RegionCode": "370112",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "長清區",
"RegionCode": "370113",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "平陰縣",
"RegionCode": "370124",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "濟陽縣",
"RegionCode": "370125",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "商河縣",
"RegionCode": "370126",
"ParentCode": "370100",
"Children": null
},
{
"RegionName": "章丘市",
"RegionCode": "370181",
"ParentCode": "370100",
"Children": null
}
]
},
{
"RegionName": "青島市",
"RegionCode": "370200",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370201",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "市南區",
"RegionCode": "370202",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "市北區",
"RegionCode": "370203",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "黃島區",
"RegionCode": "370211",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "嶗山區",
"RegionCode": "370212",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "李滄區",
"RegionCode": "370213",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "城陽區",
"RegionCode": "370214",
"ParentCode": "370200",
"Children": null
},
{
"RegionName": "膠州市",
"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": "萊西市",
"RegionCode": "370285",
"ParentCode": "370200",
"Children": null
}
]
},
{
"RegionName": "淄博市",
"RegionCode": "370300",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370301",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "淄川區",
"RegionCode": "370302",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "張店區",
"RegionCode": "370303",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "博山區",
"RegionCode": "370304",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "臨淄區",
"RegionCode": "370305",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "周村區",
"RegionCode": "370306",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "桓臺縣",
"RegionCode": "370321",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "高青縣",
"RegionCode": "370322",
"ParentCode": "370300",
"Children": null
},
{
"RegionName": "沂源縣",
"RegionCode": "370323",
"ParentCode": "370300",
"Children": null
}
]
},
{
"RegionName": "棗莊市",
"RegionCode": "370400",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370401",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "市中區",
"RegionCode": "370402",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "薛城區",
"RegionCode": "370403",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "嶧城區",
"RegionCode": "370404",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "臺兒莊區",
"RegionCode": "370405",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "山亭區",
"RegionCode": "370406",
"ParentCode": "370400",
"Children": null
},
{
"RegionName": "滕州市",
"RegionCode": "370481",
"ParentCode": "370400",
"Children": null
}
]
},
{
"RegionName": "東營市",
"RegionCode": "370500",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370501",
"ParentCode": "370500",
"Children": null
},
{
"RegionName": "東營區",
"RegionCode": "370502",
"ParentCode": "370500",
"Children": null
},
{
"RegionName": "河口區",
"RegionCode": "370503",
"ParentCode": "370500",
"Children": null
},
{
"RegionName": "墾利縣",
"RegionCode": "370521",
"ParentCode": "370500",
"Children": null
},
{
"RegionName": "利津縣",
"RegionCode": "370522",
"ParentCode": "370500",
"Children": null
},
{
"RegionName": "廣饒縣",
"RegionCode": "370523",
"ParentCode": "370500",
"Children": null
}
]
},
{
"RegionName": "煙臺市",
"RegionCode": "370600",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370601",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "芝罘區",
"RegionCode": "370602",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "福山區",
"RegionCode": "370611",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "牟平區",
"RegionCode": "370612",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "萊山區",
"RegionCode": "370613",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "長島縣",
"RegionCode": "370634",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "龍口市",
"RegionCode": "370681",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "萊陽市",
"RegionCode": "370682",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "萊州市",
"RegionCode": "370683",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "蓬萊市",
"RegionCode": "370684",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "招遠市",
"RegionCode": "370685",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "棲霞市",
"RegionCode": "370686",
"ParentCode": "370600",
"Children": null
},
{
"RegionName": "海陽市",
"RegionCode": "370687",
"ParentCode": "370600",
"Children": null
}
]
},
{
"RegionName": "濰坊市",
"RegionCode": "370700",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370701",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "濰城區",
"RegionCode": "370702",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "寒亭區",
"RegionCode": "370703",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "坊子區",
"RegionCode": "370704",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "奎文區",
"RegionCode": "370705",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "臨朐縣",
"RegionCode": "370724",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "昌樂縣",
"RegionCode": "370725",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "青州市",
"RegionCode": "370781",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "諸城市",
"RegionCode": "370782",
"ParentCode": "370700",
"Children": null
},
{
"RegionName": "壽光市",
"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": "濟寧市",
"RegionCode": "370800",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370801",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "任城區",
"RegionCode": "370811",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "兗州區",
"RegionCode": "370812",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "微山縣",
"RegionCode": "370826",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "魚臺縣",
"RegionCode": "370827",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "金鄉縣",
"RegionCode": "370828",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "嘉祥縣",
"RegionCode": "370829",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "汶上縣",
"RegionCode": "370830",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "泗水縣",
"RegionCode": "370831",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "梁山縣",
"RegionCode": "370832",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "曲阜市",
"RegionCode": "370881",
"ParentCode": "370800",
"Children": null
},
{
"RegionName": "鄒城市",
"RegionCode": "370883",
"ParentCode": "370800",
"Children": null
}
]
},
{
"RegionName": "泰安市",
"RegionCode": "370900",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "370901",
"ParentCode": "370900",
"Children": null
},
{
"RegionName": "泰山區",
"RegionCode": "370902",
"ParentCode": "370900",
"Children": null
},
{
"RegionName": "岱嶽區",
"RegionCode": "370911",
"ParentCode": "370900",
"Children": null
},
{
"RegionName": "寧陽縣",
"RegionCode": "370921",
"ParentCode": "370900",
"Children": null
},
{
"RegionName": "東平縣",
"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": "市轄區",
"RegionCode": "371001",
"ParentCode": "371000",
"Children": null
},
{
"RegionName": "環翠區",
"RegionCode": "371002",
"ParentCode": "371000",
"Children": null
},
{
"RegionName": "文登區",
"RegionCode": "371003",
"ParentCode": "371000",
"Children": null
},
{
"RegionName": "榮成市",
"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": "市轄區",
"RegionCode": "371101",
"ParentCode": "371100",
"Children": null
},
{
"RegionName": "東港區",
"RegionCode": "371102",
"ParentCode": "371100",
"Children": null
},
{
"RegionName": "嵐山區",
"RegionCode": "371103",
"ParentCode": "371100",
"Children": null
},
{
"RegionName": "五蓮縣",
"RegionCode": "371121",
"ParentCode": "371100",
"Children": null
},
{
"RegionName": "莒縣",
"RegionCode": "371122",
"ParentCode": "371100",
"Children": null
}
]
},
{
"RegionName": "萊蕪市",
"RegionCode": "371200",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "371201",
"ParentCode": "371200",
"Children": null
},
{
"RegionName": "萊城區",
"RegionCode": "371202",
"ParentCode": "371200",
"Children": null
},
{
"RegionName": "鋼城區",
"RegionCode": "371203",
"ParentCode": "371200",
"Children": null
}
]
},
{
"RegionName": "臨沂市",
"RegionCode": "371300",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "371301",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "蘭山區",
"RegionCode": "371302",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "羅莊區",
"RegionCode": "371311",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "河東區",
"RegionCode": "371312",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "沂南縣",
"RegionCode": "371321",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "郯城縣",
"RegionCode": "371322",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "沂水縣",
"RegionCode": "371323",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "蘭陵縣",
"RegionCode": "371324",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "費縣",
"RegionCode": "371325",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "平邑縣",
"RegionCode": "371326",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "莒南縣",
"RegionCode": "371327",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "蒙陰縣",
"RegionCode": "371328",
"ParentCode": "371300",
"Children": null
},
{
"RegionName": "臨沭縣",
"RegionCode": "371329",
"ParentCode": "371300",
"Children": null
}
]
},
{
"RegionName": "德州市",
"RegionCode": "371400",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "371401",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "德城區",
"RegionCode": "371402",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "陵城區",
"RegionCode": "371403",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "寧津縣",
"RegionCode": "371422",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "慶雲縣",
"RegionCode": "371423",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "臨邑縣",
"RegionCode": "371424",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "齊河縣",
"RegionCode": "371425",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "平原縣",
"RegionCode": "371426",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "夏津縣",
"RegionCode": "371427",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "武城縣",
"RegionCode": "371428",
"ParentCode": "371400",
"Children": null
},
{
"RegionName": "樂陵市",
"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": "市轄區",
"RegionCode": "371501",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "東昌府區",
"RegionCode": "371502",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "陽谷縣",
"RegionCode": "371521",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "莘縣",
"RegionCode": "371522",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "茌平縣",
"RegionCode": "371523",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "東阿縣",
"RegionCode": "371524",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "冠縣",
"RegionCode": "371525",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "高唐縣",
"RegionCode": "371526",
"ParentCode": "371500",
"Children": null
},
{
"RegionName": "臨清市",
"RegionCode": "371581",
"ParentCode": "371500",
"Children": null
}
]
},
{
"RegionName": "濱州市",
"RegionCode": "371600",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "371601",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "濱城區",
"RegionCode": "371602",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "沾化區",
"RegionCode": "371603",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "惠民縣",
"RegionCode": "371621",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "陽信縣",
"RegionCode": "371622",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "無棣縣",
"RegionCode": "371623",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "博興縣",
"RegionCode": "371625",
"ParentCode": "371600",
"Children": null
},
{
"RegionName": "鄒平縣",
"RegionCode": "371626",
"ParentCode": "371600",
"Children": null
}
]
},
{
"RegionName": "菏澤市",
"RegionCode": "371700",
"ParentCode": "370000",
"Children": [
{
"RegionName": "市轄區",
"RegionCode": "371701",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "牡丹區",
"RegionCode": "371702",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "曹縣",
"RegionCode": "371721",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "單縣",
"RegionCode": "371722",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "成武縣",
"RegionCode": "371723",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "鉅野縣",
"RegionCode": "371724",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "鄆城縣",
"RegionCode": "371725",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "鄄城縣",
"RegionCode": "371726",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "定陶縣",
"RegionCode": "371727",
"ParentCode": "371700",
"Children": null
},
{
"RegionName": "東明縣",
"RegionCode": "371728",
"ParentCode": "371700",
"Children": null
}
]
}
]
}
}
使用過多的遞歸出現錯誤，「System.StackOverflowException」，因爲遞歸數據放在棧裏，遞歸不斷的壓棧，.NET framework Runtime 就拋出異常。blog
遞歸算法解題的運行效率較低。在遞歸調用的過程中系統爲每一層的返回點、局部量等開闢了棧來存儲。遞歸次數過多容易形成棧溢出等。遞歸
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