CODEWITHSUNDEEP
c#unity-container
aleczandru
aleczandru

Reputation: 5449

Unity configure 2 implementation for one interface

Hi I am using unity as my ioc container and I have a case where I need to use an implementation for a specific case and for the rest of the case another implementation.

This is my interface:

public interface IMappingService<TFrom , TTo>
{
    TTo Map(TFrom source);
}

And this are my two implementations:

 public class AutoMapperService<TFrom, TTo> : IMappingService<TFrom, TTo>
{
    public TTo Map(TFrom source)
    {
        TTo target = Mapper.Map<TTo>(source);
        this.AfterMap(source, target);
        return target;
    }

    protected virtual void AfterMap(TFrom source, TTo target)
    {

    }
}

public class AutoMapperGetUpcomingLessonsService : AutoMapperService<GetUpcomingLessons_Result, UpcomingLessonDTO>
    {
        private readonly IOfficialNamesFormatter m_OfficialNamesFormatter;

        public AutoMapperGetUpcomingLessonsService(IOfficialNamesFormatter officialNamesFormatter)
        {
            m_OfficialNamesFormatter = officialNamesFormatter;
        }

        protected override void AfterMap(GetUpcomingLessons_Result source, UpcomingLessonDTO target)
        {
            target.TeacherOfficialName = m_OfficialNamesFormatter.GetOfficialName(target.TeacherGender,
                                                                                  target.TeacherMiddleName,
                                                                                  target.TeacherLastName);
        }
    }

I acces the implementations in my code using IServiceLocator:

ServiceLocator.GetInstance<IMappingService<IEnumerable<GetUpcomingLessons_Result>, IEnumerable<UpcomingLessonDTO>>>();

In most of the case I would like to use the AutoMapperService implementation and for doing this I specified this in my dependencyConfig file:

  container.RegisterType(typeof(IMappingService<,>), typeof(AutoMapperService<,>));

The problem appears when I want to use AutoMapperGetUpcomingLessonsService as my implementation.I tried adding this:

container.RegisterType<IMappingService<GetUpcomingLessons_Result, UpcomingLessonDTO>, AutoMapperGetUpcomingLessonsService>();

But it seems the code is not reached.How can I solve this problem?

Upvotes: 0

Views: 233

Answers (1)

Randy Levy
Randy Levy

Reputation: 22655

Your class is defined as:

AutoMapperGetUpcomingLessonsService 
    : AutoMapperService<GetUpcomingLessons_Result, UpcomingLessonDTO>

And registered like this:

container.RegisterType<IMappingService<GetUpcomingLessons_Result, 
    UpcomingLessonDTO>, AutoMapperGetUpcomingLessonsService>();

But is resolved like this:

ServiceLocator.GetInstance<IMappingService<
    IEnumerable<GetUpcomingLessons_Result>, IEnumerable<UpcomingLessonDTO>>>();

Since you are registering closed generics the types need to match exactly. IEnumerable<GetUpcomingLessons_Result> is not the same type as GetUpcomingLessons_Result. So you should either resolve without the IEnumerable or change the class definition and registration to be IEnumerable<T>.

Upvotes: 1

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