AutoMapper in MVC3 ViewModel to POCOs

Question

I am using EF Code First and defined a number of POCOs. On the other hand, There are some ViewModel classes defined for each of which. Up to here, there are two projects; Model and MVC. Moreover, there is another project containing UnitOfWork and Repository Pattern(a generic repository class).

In the UnitOfWork a number of fields and properties written. Here is an example:

public GenericRepository<ActionProvider> ActionProviderRepository
    {
        get
        {
            if (this.actionProviderRepository == null)
            {
                this.actionProviderRepository = new GenericRepository<ActionProvider>(context);
            }
            return actionProviderRepository;
        }
    }

The type of this property is that of ActionProvider class defined in the Model project.

But my problem; I need to Map each of the ViewModel to the POCO classes. After surfing the web, I've come to apply AutoMapper. So the following is what I have done in the UserController class:

 public class UserController : Controller
{
    private UnitOfWork unitOfWork = new UnitOfWork();
    private User _UserModel = new User();
    private VM_User _VM_User = new VM_User();
    //
    // GET: /User/

    public ViewResult Index()
    {
        _VM_User = Mapper.Map<MAHAL_E_MA_Model.POCO.User, VM_User>(_UserModel);


        return View(unitOfWork.UserRepository.Get(orderBy: us => us.OrderByDescending(u => u.ID)).OfType<User>().ToList());
    }
}

And the error is:

Missing type map configuration or unsupported mapping.

I have tried through these links and some other ones but did't work for me! This one

And this one

Any help would be kindly appreciated..

Colm Prunty · Accepted Answer · 2013-06-05 14:13:10Z

3

You need to create the map somewhere

Mapper.CreateMap<MAHAL_E_MA_Model.POCO.User, VM_User>();

I have a Mapping.Setup() method in Application_Start that creates all the maps needed.

answered Jun 5, 2013 at 14:13

Colm Prunty

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10 Comments

user2394196 Over a year ago

I went through your solution too, but another error came out. System.InvalidOperationException: The model item passed into the dictionary is of type 'System.Collections.Generic.List1[ProjectName.POCO.User]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable1[ProjectName.ViewModel.Man.VM_User]'. And I also have this code on the View file: @model IEnumerable<MAHAL_E_MA_Proj.ViewModel.Man.VM_User> So, Do you have any idea??

Colm Prunty Over a year ago

Are you calling a ToList on the User collection before passing it to the view?

user2394196 Over a year ago

As mentioned in the UserController class above(in the question), yes I am. Actually, the Get method is ended with .ToList().

Colm Prunty Over a year ago

Basically, as the error says, you're passing it a List when it wants an IEnumerable. If it's going to get a list every time, you can just change your view to take @model List<MAHAL_E_MA_Proj.ViewModel.Man.VM_User>

Colm Prunty Over a year ago

Wait, that won't work, sorry, it wants MAHAL_E_MA_Proj.ViewModel.Man.VM_User objects and you're passing it User objects. You'll have to figure out what you want in the View and pass the correct thing, but this is a different question.

|

user2394196 · Accepted Answer · 2013-06-05 14:41:26Z

1

I finally overcome the matter by the following lines of code and want to share it perhaps be useful for others:

public ViewResult Index()
    {
        var query = unitOfWork.UserRepository.Get(orderBy: us => us.OrderByDescending(u => u.ID)).OfType<User>().ToList();
        Mapper.CreateMap<User, VM_User>();
        IList<VM_User> vm_Users = Mapper.Map<IList<User>, IList<VM_User>>(query);

        return View(vm_Users);
    }

answered Jun 5, 2013 at 14:41

user2394196

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