using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using AutoMapper;

public class Program

{

    public static void Main()

    {

        string json = @"{

            ""collis"": [

                {

                    ""count"": 2,

                    ""description"": ""Colli 1""

                },

                {

                    ""count"": 1,

                    ""description"": ""Colli 2""

                }

            ]

        }";

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

        MapperConfiguration _config = new MapperConfiguration(cfg =>

                                                              {

                                                                  cfg.CreateMap<Colli, ColliDto>();

                                                                  cfg.CreateMap<List<Colli>, List<ColliDto>>()

                                                                      .ConvertUsing<ColliListConverter>();

                                                                  cfg.CreateMap<Shipment, ShipmentDto>();

                                                                      //.ConvertUsing<ShipmentConverter>();

                                                              });

        IMapper _mapper = _config.CreateMapper();

        ShipmentDto dest = _mapper.Map<ShipmentDto>(src);

        Console.WriteLine(JsonConvert.SerializeObject(dest, Formatting.Indented));

    }

}

​

public class ColliListConverter : ITypeConverter<List<Colli>, List<ColliDto>>

{

    public List<ColliDto> Convert(List<Colli> source, List<ColliDto> destination, ResolutionContext context)

    {

        var retval = new List<ColliDto>();

        foreach (var colli in source)

        {

            for (int i = 0; i < colli.Count; i++)

            {

                retval.Add(context.Mapper.Map<ColliDto>(colli));

            }

        }

        return retval;

    }

}

​

public class Colli

{

    public int Count { get; set; }

​

    public string Description { get; set; }

}

​

public class Shipment

{

    public List<Colli> Collis { get; set; }

}

​

public class ShipmentDto

{

    public List<ColliDto> Collis { get; set; }

}

​

public class ColliDto

{

    public string Description { get; set; }

}

​