[asp.net-mvc] Automapper missing type map configuration or unsupported mapping - Error

Entity Model

public partial class Categoies
{
    public Categoies()
    {
        this.Posts = new HashSet<Posts>();
    }

    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public Nullable<int> PositionId { get; set; }

    public virtual CategoryPositions CategoryPositions { get; set; }
    public virtual ICollection<Posts> Posts { get; set; }
}

View Model

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

    [Required(ErrorMessage = "{0} alani bos birakilmamalidir!")]
    [Display(Name = "Kategori Adi")]
    public string Name { get; set; }

    [Display(Name = "Kategori Açiklama")]
    public string Description { get; set; }

    [Display(Name = "Kategori Pozisyon")]
    [Required(ErrorMessage="{0} alani bos birakilmamalidir!")]
    public int PositionId { get; set; }
}

CreateMap

Mapper.CreateMap<CategoriesViewModel, Categoies>()
            .ForMember(c => c.CategoryPositions, option => option.Ignore())
            .ForMember(c => c.Posts, option => option.Ignore());

Map

[HttpPost]
public ActionResult _EditCategory(CategoriesViewModel viewModel)
{
    using (NewsCMSEntities entity = new NewsCMSEntities())
    {
        if (ModelState.IsValid)
        {
            try
            {
                category = entity.Categoies.Find(viewModel.Id);
                AutoMapper.Mapper.Map<CategoriesViewModel, Categoies>(viewModel, category);
                //category = AutoMapper.Mapper.Map<CategoriesViewModel, Categoies>(viewModel);
                //AutoMapper.Mapper.Map(viewModel, category);
                entity.SaveChanges();

                // Veritabani islemleri basarili ise yönlendirilecek sayfayi 
                // belirleyip ajax-post-success fonksiyonuna gönder.
                return Json(new { url = Url.Action("Index") });
            }
            catch (Exception ex)
            {

            }
        }

        // Veritabani islemleri basarisiz ise modeli tekrar gönder.
        ViewBag.Positions = new SelectList(entity.CategoryPositions.ToList(), "Id", "Name");
        return PartialView(viewModel);
    }
}

Error

Missing type map configuration or unsupported mapping. Mapping types: CategoriesViewModel -> Categoies_7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D NewsCMS.Areas.Admin.Models.CategoriesViewModel -> System.Data.Entity.DynamicProxies.Categoies_7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D

Destination path: Categoies_7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D

Source value: NewsCMS.Areas.Admin.Models.CategoriesViewModel

What am I missing? I try to find, but I cant see problem.

UPDATE

I have specified in application_start in Global.asax

protected void Application_Start()
{
    InitializeAutoMapper.Initialize();
}

InitializeClass

public static class InitializeAutoMapper
{
    public static void Initialize()
    {
        CreateModelsToViewModels();
        CreateViewModelsToModels();
    }

    private static void CreateModelsToViewModels()
    {
        Mapper.CreateMap<Categoies, CategoriesViewModel>();
    }

    private static void CreateViewModelsToModels()
    {
        Mapper.CreateMap<CategoriesViewModel, Categoies>()
            .ForMember(c => c.CategoryPositions, option => option.Ignore())
            .ForMember(c => c.Posts, option => option.Ignore());
    }
}

I did this to remove the error:

Mapper.CreateMap<FacebookUser, ProspectModel>();
prospect = Mapper.Map(prospectFromDb, prospect);

Notice the Categoies_7314E98C41152985A4218174DDDF658046BC82AB0ED9E1F0440514D79052F84D class in the exception? That's an Entity Framework proxy. I would recommend you disposing of your EF context to ensure that all your objects are eagerly loaded from the database and no such proxies exist:

[HttpPost]
public ActionResult _EditCategory(CategoriesViewModel viewModel)
{
    Categoies category = null;
    using (var ctx = new MyentityFrameworkContext())
    {
        category = ctx.Categoies.Find(viewModel.Id);
    }
    AutoMapper.Mapper.Map<CategoriesViewModel, Categoies>(viewModel, category);
    //category = AutoMapper.Mapper.Map<CategoriesViewModel, Categoies>(viewModel, category);
    entity.SaveChanges();
}

If the entity retrieval is performed inside a data access layer (which of course is the correct way) make sure you dispose your EF context before returning instances from your DAL.

I was trying to map an IEnumerable to an object. This is way I got this error. Maybe it helps.

I know this is a rather old question as of now, but I had found the proper solution was that I was not declaring the assembly attribute.

My code is:

using AutoMapper;
...

namespace [...].Controllers
{
    public class HousingTenureTypesController : LookupController<HousingTenureType, LookupTypeModel>
    {
        Mapper.CreateMap<HousingTenureType, LookupTypeModel>().ReverseMap();
    }
    ...
}

This was fixed by adding the following line before my namespace declaration:

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(HousingTenureTypesController), "AutoMapperStart")]

The full code is:

using AutoMapper;
...

[assembly: WebActivatorEx.PreApplicationStartMethod(typeof(HousingTenureTypesController), "AutoMapperStart")]

namespace [...].Controllers
{
    public class HousingTenureTypesController : LookupController<HousingTenureType, LookupTypeModel>
    {
        Mapper.CreateMap<HousingTenureType, LookupTypeModel>().ReverseMap();
    }
    ...
}

Where have you specified the mapping code (CreateMap)? Reference: Where do I configure AutoMapper?

If you're using the static Mapper method, configuration should only happen once per AppDomain. That means the best place to put the configuration code is in application startup, such as the Global.asax file for ASP.NET applications.

If the configuration isn't registered before calling the Map method, you will receive Missing type map configuration or unsupported mapping.

In your class AutoMapper profile, you need to create a map for your entity and viewmodel.

ViewModel To Domain Model Mappings:

This is usually in AutoMapper/DomainToViewModelMappingProfile

In Configure(), add a line like

Mapper.CreateMap<YourEntityViewModel, YourEntity>();

Domain Model To ViewModel Mappings:

In ViewModelToDomainMappingProfile, add:

Mapper.CreateMap<YourEntity, YourEntityViewModel>();

Gist example

Upgrade Automapper to version 6.2.2. It helped me

I had same issue in .Net Core. Because my base dto class(i give it as a type in startup for automapper assembly) was in different project. Automapper tried to search for profiles in base class project. But my dto's were in different project. I moved my base class. And problem solved. This may help for some persons.

I created a new AutomapperProfile class. It extends Profile. We have over 100 projects in our solution. Many projects have an AutomapperProfile class, but this one was new to this existing project. However, I did find what I had to do to fix this issue for us. There is a Binding project. Within the Initialization there is this code:

var mappingConfig = new List<Action<IConfiguration>>();

// Initialize the Automapper Configuration for all Known Assemblies
mappingConfig.AddRange( new List<Action<IConfiguration>>
{
   ConfigureProfilesInAssemblyOfType<Application.Administration.AutomapperProfile>,
   //...

I had to add ConfigureProfilesInAssemblyOfType<MyNewNamespace.AutomapperProfile>

Note that ConfigureProfilesInAssemblyOfType looks like this:

    private static void ConfigureProfilesInAssemblyOfType<T>( IConfiguration configuration )
    {
        var log = LogProvider.Get( typeof (AutomapperConfiguration) );

        // The Automapper Profile Type
        var automapperProfileType = typeof (Profile);

        // The Assembly containing the type
        var assembly = typeof (T).Assembly;
        log.Debug( "Scanning " + assembly.FullName );

        // Configure any Profile classes found in the assembly containing the type.
        assembly.GetTypes()
            .Where( automapperProfileType.IsAssignableFrom ).ToList()
            .ForEach( x =>
            {
                log.Debug( "Adding Profile '" + x.FullName + "'" );
                configuration.AddProfile( Activator.CreateInstance( x ) as Profile );
            } );
    }

Best regards, -Jeff

In my case, I had created the map, but was missing the ReverseMap function. Adding it got rid of the error.

      private static void RegisterServices(ContainerBuilder bldr)
      {
         var config = new MapperConfiguration(cfg =>
         {
            cfg.AddProfile(new CampMappingProfile());
         });
         ...
       }


      public CampMappingProfile()
      {
         CreateMap<Talk, TalkModel>().ReverseMap();
         ...
      }

Check your Global.asax.cs file and be sure that this line be there

 AutoMapperConfig.Configure();