using System;

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<OrgChart> newOrgChartData = new List<OrgChart>();

        newOrgChartData.Add(new OrgChart{name = "A", coordination = "1"});

        newOrgChartData.Add(new OrgChart{name = "B", coordination = "1.1"});

        newOrgChartData.Add(new OrgChart{name = "C", coordination = "1.2"});

        newOrgChartData.Add(new OrgChart{name = "D", coordination = "1.1.1"});

        newOrgChartData.Add(new OrgChart{name = "E", coordination = "1.1.2"});

        newOrgChartData.Add(new OrgChart{name = "F", coordination = "1.1.1.1"});

        var getOrgChart = (from root in newOrgChartData

                           where root.coordination.Length == 1

                           select new GetOrgChart

                           {

                               name = root.coordination,

                               children = newOrgChartData.Where(o => o.coordination.Count(c => c == '.') == 1

                                                            && o.coordination.StartsWith(root.coordination)).ToList() //level 2

                                   .Select(levelTwo => new GetOrgChart

                                           {

                                               name = levelTwo.coordination,

                                               children = newOrgChartData.Where(o => o.coordination.Count(c => c == '.') == 2

                                                                            && o.coordination.StartsWith(levelTwo.coordination)).ToList() //level 3

                                                   .Select(levelThree => new GetOrgChart

                                                           {

                                                               name = levelThree.coordination

                                                                   //children = .... and so on

                                                           }).ToList()

                                           }).ToList()

                           }).ToList();

        string json = JsonConvert.SerializeObject(getOrgChart);

        Console.WriteLine(json);

    }

}

​

public class OrgChart {

    public string name {get; set;}

    public string coordination {get; set;}

}

​

public class GetOrgChart {

    public string name {get; set;}

    public List<GetOrgChart> children {get; set;}

}