Error mapping types - Asp.Net API project

Question

I have an Asp.Net web API project. And I'm implementing a shopping cart. So I have models that have to be converted to Dtos. So I'm using automapper to map Models to Dtos so I can transfer data but for some reason, I'm getting the following error.

The error message I get:

"Error mapping types.\r\n\r\nMapping types:\r\nCartModel -> CartDto\r\nMoby.Services.ShoppingCart.API.Models.CartModel -> Moby.Services.ShoppingCart.API.Models.Dto.CartDto\r\n\r\nType Map configuration:\r\nCartModel -> CartDto\r\nMoby.Services.ShoppingCart.API.Models.CartModel -> Moby.Services.ShoppingCart.API.Models.Dto.CartDto\r\n\r\nDestination Member:\r\nCartDetails\r\n"

Automapper config class:

public class MapperConfig
{
    public static MapperConfiguration RegisterMaps()
    {
        return new MapperConfiguration(config =>
        {
            config.CreateMap<CartModel, CartDto>().ReverseMap();
            config.CreateMap<CartHeaderModel, CartHeaderDto>().ReverseMap();
            config.CreateMap<CartDetailsModel, CartDetailsDto>().ReverseMap();
            config.CreateMap<ProductModel, ProductDto>().ReverseMap();
        });
    }
}

Automapper dependency injection:

var mapper = MapperConfig.RegisterMaps().CreateMapper();

builder.Services.AddSingleton(mapper);

builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

CartModel:

public class CartModel
{
    public CartHeaderModel CartHeader { get; set; }

    public IEnumerable<CartDetailsModel> CartDetails { get; set; }
}

CartDto:

public class CartDto
{
    public CartHeaderDto CartHeader { get; set; }

    public IEnumerable<CartDetailsDto> CartDetails { get; set; }
}

CartDetailsModel:

public int Id { get; set; }

    public int CartHeaderId { get; set; }

    [ForeignKey(nameof(CartHeaderId))]
    public virtual CartHeaderModel CartHeader { get; set; }

    public int ProductId { get; set; }

    [ForeignKey(nameof(ProductId))]
    public virtual ProductModel Product { get; set; }

    public int Count { get; set; }

CartDetailsDto

public class CartDetailsDto
{
    public int Id { get; set; }

    public int CartHeaderId { get; set; }

    public virtual CartHeaderDto CartHeader { get; set; }

    public int ProductId { get; set; }

    public virtual ProductModel Product { get; set; }

    public int Count { get; set; }
}

docs.automapper.org/en/latest/Dependency-injection.html

Lucian Bargaoanu
– Lucian Bargaoanu

2022-08-28 05:01:30 +00:00
Commented Aug 28, 2022 at 5:01 — Lucian Bargaoanu
– Lucian Bargaoanu, Commented Aug 28, 2022 at 5:01

Dimitris Maragkos · Accepted Answer · 2022-08-28 01:20:03Z

2

Define your mapping inside a class that extends Profile class.

public class MappingProfile : Profile
{
    public MappingProfile()
    {
        CreateMap<CartModel, CartDto>().ReverseMap();
        CreateMap<CartHeaderModel, CartHeaderDto>().ReverseMap();
        CreateMap<CartDetailsModel, CartDetailsDto>().ReverseMap();
        CreateMap<ProductModel, ProductDto>().ReverseMap();
    }
}

Remove these lines:

var mapper = MapperConfig.RegisterMaps().CreateMapper();

builder.Services.AddSingleton(mapper);

Only keep this line:

builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

AddAutoMapper will scan the assemblies for any classes that extend Profile and load the mapping configuration from them. I will also register a mapper that you can inject in your services (IMapper).

edited Aug 28, 2022 at 1:20

answered Aug 28, 2022 at 1:14

Dimitris Maragkos

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