using System;

using System.Collections.Generic;

using System.Linq;

using System.Dynamic;

using AutoMapper;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        MapperConfiguration _config = new MapperConfiguration(config => 

        {       

            config.CreateMap<Source, List<Destination>>()

                .ConvertUsing<SourceToListDestinationTypeConverter>();

        });

        string json = @"{

          ""Request"": {

            ""RequestedSymbols"": ""ABC,BCD,CDE"",

            ""RequestedFields"": ""ASK,BID,LAST"",

            ""Host"": ""XYZ"",

            ""Id"": ""123""

          },

          ""Error"": {

            ""Code"": ""0"",

            ""Description"": """"

          },

          ""Records"": {

            ""Record"": [

              {

                ""Fields"": {

                  ""Field"": [

                    {

                      ""Id"": ""200"",

                      ""Name"": ""ASK"",

                      ""Value"": ""43.75""

                    },

                    {

                      ""Id"": ""100"",

                      ""Name"": ""BID"",

                      ""Value"": ""43.73""

                    },

                    {

                      ""Id"": ""300"",

                      ""Name"": ""LAST"",

                      ""Value"": ""43.73""

                    }

                  ]

                },

                ""Req_sym"": ""ABC"",

                ""Key"": ""ABC"",

                ""Stale"": """"

              },

              {

                ""Fields"": {

                  ""Field"": [

                    {

                      ""Id"": ""200"",

                      ""Name"": ""ASK"",

                      ""Value"": ""76.18""

                    },

                    {

                      ""Id"": ""100"",

                      ""Name"": ""BID"",

                      ""Value"": ""76.17""

                    },

                    {

                      ""Id"": ""300"",

                      ""Name"": ""LAST"",

                      ""Value"": ""76.19""

                    }

                  ]

                },

                ""Req_sym"": ""BCD"",

                ""Key"": ""BCD"",

                ""Stale"": """"

              },

              {

                ""Fields"": {

                  ""Field"": [

                    {

                      ""Id"": ""200"",

                      ""Name"": ""ASK"",

                      ""Value"": ""16.34""

                    },

                    {

                      ""Id"": ""100"",

                      ""Name"": ""BID"",

                      ""Value"": ""16.33""

                    },

                    {

                      ""Id"": ""300"",

                      ""Name"": ""LAST"",

                      ""Value"": ""16.33""

                    }

                  ]

                },

                ""Req_sym"": ""CDE"",

                ""Key"": ""CDE"",

                ""Stale"": """"

              }

            ]

          },

          ""Service"": ""XYZ""

        }";

        Source src = JsonConvert.DeserializeObject<Source>(json);

        IMapper _mapper = _config.CreateMapper();

        List<Destination> dests = _mapper.Map<Source, List<Destination>>(src);

        Console.WriteLine(JsonConvert.SerializeObject(dests, new JsonSerializerSettings { Formatting = Formatting.Indented }));

    }

}

​

public class Source

{

    public Request Request { get; set; }

    public Error Error { get; set; }

    public Records Records { get; set; }

    public string Service { get; set; }

}

​

public class Records

{

    public List<Record> Record { get; set; }

}

​

public class Fields

{

    public List<Field> Field { get; set; }

}

​

public class Field

{

    public string Id { get; set; }

    public string Name { get; set; }

    public string Value { get; set; }

}

​

public class Request

{

    public string RequestedSymbols { get; set; }

    public string RequestedFields { get; set; }

    public string Host { get; set; }

    public string Id { get; set; }

}

​

public class Error

{

    public string Code { get; set; }

    public string Description { get; set; }

}

​

public class Record

{

    public Fields Fields { get; set; }

    public string Req_sym { get; set; }

    public string Key { get; set; }

    public string Stale { get; set; }

}

​

public class Destination

{

    public string Symbol { get; set; }

    public string ASK { get; set; }

    public string BID { get; set; }

    public string LAST { get; set; }

}

​

public class SourceToListDestinationTypeConverter : ITypeConverter<Source, List<Destination>>

{

    public List<Destination> Convert(Source source, List<Destination> destination, ResolutionContext context)

    {

        List<Destination> result = new List<Destination>();

        foreach (var record in source.Records.Record)

        {

            Dictionary<string, object> fieldDict = record.Fields.Field

                .ToDictionary(x => x.Name, x => (object)x.Value);

​

            fieldDict.Add(nameof(Destination.Symbol), record.Req_sym);

​

            result.Add(context.Mapper.Map<Destination>(fieldDict));

        }

        return result;

    }

}