Missing type map configuration or unsupported mapping. Automapper

Question

I am using Automapper with NPoco in my Web Api project. Here is my Dto's and models:

[TableName("Component")]
    public class ComponentDto
    {
        [Column("Id")]
        public int Id { get; set; }

        public string BotanicalName { get; set; }
    }

[TableName("FormulaComponent")]
    public class FormulaComponentDto
    {
        [Column("Id")]
        public int Id { get; set; }

        [Reference(ReferenceType.Foreign, ColumnName = "ComponentId", ReferenceMemberName = "Id")]
        public ComponentDto Component { get; set; }

    }

public class Component
    {
        public int Id { get; set; }
        public string BotanicalName { get; set; }
}

public class FormulaComponent
    {
        public int Id { get; set; }
        public Component Component { get; set; }
}

I am trying to map one model to another using Automapper. Here is my automapper profile:

public class AutoMapperProfile : Profile
    {
        protected override void Configure()
        {
            //From Model to Dto
            Mapper.CreateMap<FormulaComponent, FormulaComponentDto>().ReverseMap();
            Mapper.CreateMap<ComponentDto, Component>().ReverseMap();
        }
    }

But when I'm trying, I have an exeption: "Missing type map configuration or unsupported mapping" :

public IEnumerable<FormulaComponent> GetAll()
        {
            var formulaComponents = _repository.Get().Include(x => x.Component).ToList();
            return _mapper.Map<IEnumerable<FormulaComponentDto>, IEnumerable<FormulaComponent>>(formulaComponents);
        }

UPD: automapper initialized into LightInject:

public partial class Startup
    {
        public static void InitLightInject(HttpConfiguration config)
        {
            var container = new ServiceContainer();

            Mapper.AddProfile<AutoMapperProfile>();
            container.Register<IMappingEngine>(c => Mapper.Engine);
         }
     }

A repro would help. Make a gist that we can execute and see fail. — Lucian Bargaoanu
Please add code where the profile gets registered (Mapper initialization) — rufer7

Michael Kostiuchenko Michael Kostiuchenko · Accepted Answer · 2019-03-20T08:21:58

I fixed this issue. In my FormulaComponent class it was incorrect namespase for Component class: System.ComponentModel instead of Domain.Components

Missing type map configuration or unsupported mapping. Automapper

1 Answers