C#【关于树形表结构的数据如何返回级联数据结构】

关于树形表结构的数据如何返回级联数据结构

        /// 

        /// 数据组装
        /// 
        /// 开始级数据
        /// 总省市区数据
        /// 结束级 默认区（含）1国2省3市4区
        /// 
        public List<City_OM> GetCityRange(List<City_OM> regionTypeData, List<City_OM> source, int endRegion = 4)
        {
            if (!regionTypeData.Any() || int.Parse(regionTypeData.First().RegionType) > endRegion)
            {
                return new List<City_OM>();
            }

            List<City_OM> data = new List<City_OM>();
            regionTypeData.ForEach(f =>
            {
                data.Add(new City_OM
                {
                    Code = f.Code,
                    Name = f.Name,
                    ParentCode = f.ParentCode,
                    RegionType = f.RegionType,
                    Children = GetCityRange(source.Where(w => w.ParentCode == f.Code).ToList(), source, endRegion)
                });
            });

            return data;
        }

实体

 /// 

 /// 获取省市区
 /// 
 public class City_OM
 {
     /// 

     /// id
     /// 
     public int Code { get; set; }

     /// 

     /// 上级id
     /// 
     public int ParentCode { get; set; }

     /// 

     /// 名称
     /// 
     public string Name { get; set; }

     /// 

     /// 级别 1 国家 2 省 3 市 4 区县 
     /// 
     public string RegionType { get; set; }

     /// 

     /// 
     /// 
     public List<City_OM> Children { get; set; }

 }

以宁夏回族自治区为例，返回：

{
            "code": 640000,
            "parentCode": 1,
            "name": "宁夏回族自治区",
            "regionType": "2",
            "children": [
                {
                    "code": 640100,
                    "parentCode": 640000,
                    "name": "银川市",
                    "regionType": "3",
                    "children": [
                        {
                            "code": 640104,
                            "parentCode": 640100,
                            "name": "兴庆区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640105,
                            "parentCode": 640100,
                            "name": "西夏区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640106,
                            "parentCode": 640100,
                            "name": "金凤区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640121,
                            "parentCode": 640100,
                            "name": "永宁县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640122,
                            "parentCode": 640100,
                            "name": "贺兰县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640181,
                            "parentCode": 640100,
                            "name": "灵武市",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640182,
                            "parentCode": 640100,
                            "name": "其它区",
                            "regionType": "4",
                            "children": []
                        }
                    ]
                },
                {
                    "code": 640200,
                    "parentCode": 640000,
                    "name": "石嘴山市",
                    "regionType": "3",
                    "children": [
                        {
                            "code": 640202,
                            "parentCode": 640200,
                            "name": "大武口区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640205,
                            "parentCode": 640200,
                            "name": "惠农区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640221,
                            "parentCode": 640200,
                            "name": "平罗县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640222,
                            "parentCode": 640200,
                            "name": "其它区",
                            "regionType": "4",
                            "children": []
                        }
                    ]
                },
                {
                    "code": 640300,
                    "parentCode": 640000,
                    "name": "吴忠市",
                    "regionType": "3",
                    "children": [
                        {
                            "code": 640302,
                            "parentCode": 640300,
                            "name": "利通区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640303,
                            "parentCode": 640300,
                            "name": "红寺堡区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640323,
                            "parentCode": 640300,
                            "name": "盐池县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640324,
                            "parentCode": 640300,
                            "name": "同心县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640381,
                            "parentCode": 640300,
                            "name": "青铜峡市",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640382,
                            "parentCode": 640300,
                            "name": "其它区",
                            "regionType": "4",
                            "children": []
                        }
                    ]
                },
                {
                    "code": 640400,
                    "parentCode": 640000,
                    "name": "固原市",
                    "regionType": "3",
                    "children": [
                        {
                            "code": 640402,
                            "parentCode": 640400,
                            "name": "原州区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640422,
                            "parentCode": 640400,
                            "name": "西吉县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640423,
                            "parentCode": 640400,
                            "name": "隆德县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640424,
                            "parentCode": 640400,
                            "name": "泾源县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640425,
                            "parentCode": 640400,
                            "name": "彭阳县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640426,
                            "parentCode": 640400,
                            "name": "其它区",
                            "regionType": "4",
                            "children": []
                        }
                    ]
                },
                {
                    "code": 640500,
                    "parentCode": 640000,
                    "name": "中卫市",
                    "regionType": "3",
                    "children": [
                        {
                            "code": 640502,
                            "parentCode": 640500,
                            "name": "沙坡头区",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640521,
                            "parentCode": 640500,
                            "name": "中宁县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640522,
                            "parentCode": 640500,
                            "name": "海原县",
                            "regionType": "4",
                            "children": []
                        },
                        {
                            "code": 640523,
                            "parentCode": 640500,
                            "name": "其它区",
                            "regionType": "4",
                            "children": []
                        }
                    ]
                }
            ]
        }