Automapper ninject dependencies

Question

I have a problem with the Automapper on my website and I can't find a solution. I've created a class called AutoMapperProfile where I'd like to put all my Maps

public class AutoMapperProfile: Profile
{
    private readonly IConfiguration _mapper;

    public AutoMapperProfile(IConfiguration mapper)
    {
        _mapper = mapper;
    }

    protected override void Configure()
    {
        base.Configure();

        _mapper.CreateMap<SlideDTO, Slide>();
        _mapper.CreateMap<Slide, SlideDTO>();
    }
}

For DI purposes I'm using Ninject, so I've added the following bindings in NinjectWebCommon:

kernel.Bind<IMappingEngine>().ToMethod(ctx => Mapper.Engine);
kernel.Bind<IConfigurationProvider>().ToMethod(x => Mapper.Engine.ConfigurationProvider);

The controller looks like this:

private readonly ISlideRepository slideRepository;
    private readonly IMappingEngine mappingEngine;

    public HomeController(
        ISlideRepository slideRepository,
        IMappingEngine mappingEngine)
    {
        this.slideRepository = slideRepository;
        this.mappingEngine = mappingEngine;
    }

    [HttpGet]
    public ActionResult Index()
    {
        var model = new IndexViewModel();
        var slide = slideRepository.GetSlide();
        model.Slide = mappingEngine.Map<SlideDTO, Slide>(slide);

        return View(model);
    }

When I map from SlideDTO to Slide I get the following error:

Missing type map configuration or unsupported mapping.

So my best guess is that I didn't do the binds correctly so that Automapper can see my maps, but I'm not sure how can I fix it.

Answer 1

You don't need to inject IConfiguration into AutoMapperProfile, it already inherits a CreateMap method from Profile.

Make sure that AutoMapperProfile has a parameterless constructor like this:

public class AutoMapperProfile : Profile
{
    protected override void Configure()
    {
        this.CreateMap<SlideDTO, Slide>();
        this.CreateMap<Slide, SlideDTO>();
    }
}

And then you need to make sure that AutoMapper knows about this profile, here is how you can do it:

Mapper.Engine.ConfigurationProvider.AddProfile<AutoMapperProfile>();

Please note that you can invoke the AddProfile method on any IConfigurationProvider (if you decide not to use the global ConfigurationProvider and Engine).