using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using AutoMapper;

using System.Linq;

using Newtonsoft.Json;

​

public class Program

{

    public static void Main()

    {

        var config = new MapperConfiguration(cfg =>

        {

​

            cfg.CreateMap<Brand, string>()

                .ConvertUsing(source => source.Name ?? string.Empty);

            cfg.CreateMap<string, Brand>()

                .ConvertUsing(source => new Brand { Name = source });

            cfg.CreateMap<Product, ProductDto>()

                .ForMember(dest => dest.Brand, opt => opt.MapFrom(p => p.Brand.Name))

                .ForMember(dest => dest.Categories, opt => opt.MapFrom(p => p.ProductCategories.Select(pc => pc.Category.Name)))

                .ReverseMap();

        });

        IMapper mapper = config.CreateMapper();

        var product = new Product

        {

            Id = 1,

            Name = "Product 1",

            Description = "Product 1 Desc",

            Price = 10,

            BrandId = 1,

            Brand = new Brand { Id = 1, Name = "Brand 1" },

            ProductCategories = new List<ProductCategory>

            {

                new ProductCategory { Category = new Category { Name = "Category 1" } }

            }

        };

        var productDto = mapper.Map<ProductDto>(product);

        var reverseProduct = mapper.Map<Product>(productDto);

        Console.WriteLine(JsonConvert.SerializeObject(reverseProduct));

    }

}

​

public class Product

{

    public int Id { get; set; }

​

    public string Name { get; set; }

​

    public string Description { get; set; }

​

    public decimal Price { get; set; }

​

    public int BrandId { get; set; }

​

    public Brand Brand { get; set; }

​

    public ICollection<ProductCategory> ProductCategories { get; set; }

}

​

public class Brand

{

    public int Id { get; set; }

​

    [Required]

    [MaxLength(100)]

    public string Name { get; set; }

}

​

public class ProductDto

{

    public int Id { get; set; }

​

    public string Name { get; set; }

​

    public string Description { get; set; }

​

    public decimal Price { get; set; }

​

    public string Brand { get; set; }

​

    public List<string> Categories { get; set; }

}

​

public class ProductCategory

{

    public Category Category { get; set; }

}

​

public class Category

{

    public string Name { get; set; }

}