using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Linq;

using System.Reflection;

using System.Text;

using System.Threading.Tasks;

namespace DFS

{

    class Program

    {

        static void Main(string[] args)

        {

            List<HelloChinaModel> MList = new List<HelloChinaModel>()

            {

                new HelloChinaModel(){ Id=,Province="河南省",City="商丘市",District="永城市",OrgName="薛湖镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="河南省",City="商丘市",District="夏邑县",OrgName="火店乡",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="河南省",City="商丘市",District="睢阳区",OrgName="龙华小区",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="河南省",City="平顶山市",District="新华区",OrgName="河南城建学院",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="河南省",City="平顶山市",District="鲁山县",OrgName="炉山镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="河南省",City="洛阳市",District="阳逻县",OrgName="大杨镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="江苏省",City="苏州市",District="张家港市",OrgName="乐余镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="江苏省",City="苏州市",District="昆山市",OrgName="小上海镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="江苏省",City="南京市",District="雨花台区",OrgName="雨花台小区",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="江苏省",City="徐州市",District="沛县",OrgName="王文学镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="山东省",City="日照市",District="花果山县",OrgName="猴子镇",AddTime=DateTime.Now},

                new HelloChinaModel(){ Id=,Province="山东省",City="青岛市",District="青岛啤酒县",OrgName="扎啤镇",AddTime=DateTime.Now},

            };

            // 首先根据省份分组

            var P_ls = MList.GroupBy(a =>  a.Province ).Select(g => (new { Province = g.Key, Citys = g })).ToList();//省份列表

            //

             List<Model_P> PList = new List<Model_P>();

            foreach (var item in P_ls)

            {

                Model_P P = new Model_P();

                //

                //

                List<Model_C> CList = new List<Model_C>();

                //获取各个分组

                var Province = item.Province;//省份的名称

                var CitysList = item.Citys;//省份对应的市 列表

                var C_ls = CitysList.GroupBy(a => a.City ).Select(g => new { City = g.Key, Districts = g }) ;//市/区列表

                foreach (var Citem in C_ls)

                {

                    List<Model_D> DList = new List<Model_D>();

                    Model_C C = new Model_C();

                    //

                    var DistrictsLsit = Citem.Districts;//

                    var D_ls = DistrictsLsit.GroupBy(a => a.District ).Select(g => new { Districts = g.Key, OrgNames = g });//县/区列表

                    foreach (var Ditem in D_ls)

                    {

                        List<Model_O> OList = new List<Model_O>();

                        Model_D D = new Model_D();

                        var OrgNamesList = Ditem.OrgNames.ToList();

                        var O_ls = OrgNamesList.GroupBy(a =>a.OrgName ).Select(g => new { OrgName = g.Key });//乡镇列表/没有下级了

                        foreach (var Oitem in O_ls)

                        {

                            Model_O O = new Model_O();

                            string orgName = Oitem.OrgName.ToString();

                            O.OrgName = orgName;

                            OList.Add(O);

                            D.nodes = OList;

                        }

                        string Dname = Ditem.Districts.ToString();

                        D.District = Dname;

                        DList.Add(D); C.nodes = DList;

                    }

                    string Cname = Citem.City.ToString();

                    C.City=Cname;

                    CList.Add(C);

                    P.nodes = CList;

                }

                P.Province = item.Province.ToString();

                PList.Add(P);

            }

            string Json = JsonConvert.SerializeObject(PList);

            Console.WriteLine(Json);

            Console.ReadKey();

        }

    }

    public partial class HelloChinaModel

    {

        public int Id { get; set; }

        public string Province { get; set; }

        public string City { get; set; }

        public string District { get; set; }

        public string OrgName { get; set; }

        public Nullable<System.DateTime> AddTime { get; set; }

    }

    /// <summary>

    /// 省

    /// </summary>

    public class Model_P

    {

        public string Province { get; set; }

        public List<Model_C> nodes { get; set; }

    }

    /// <summary>

    /// 市/区

    /// </summary>

    public class Model_C

    {

        public string City { get; set; }

        public List<Model_D> nodes { get; set; }

    }

    /// <summary>

    /// 县(县级市)/区

    /// </summary>

    public class Model_D

    {

        public string District { get; set; }

        public List<Model_O> nodes { get; set; }

    }

    /// <summary>

    /// 镇/乡/其他

    /// </summary>

    public class Model_O

    {

        public string OrgName { get; set; }

    }

}