Specifying a default Unity type mapping for a generic interface and class pair

Question

We're using constructor-based dependency injection, AutoMapper and Unity on a codebase.

We have wrapped AutoMapper with a generic interface...

public interface IMapper<TSource, TDestination>
{
    TDestination Map(TSource source);
}

And a class that implements this interface...

public class AutomaticMapper<TSource, TDestination> : IMapper<TSource, TDestination>
{
    public TDestination Map(TSource source)
    {
        return AutoMapper.Mapper.Map<TSource, TDestination>(source);
    }
}

This works well, but it means that for every mapping we define in the AutoMapper configuration we need to perform an additional UnityContainer.RegisterType.

These type mappings are almost always of the form

container.RegisterType<IMapper<ClassA, ClassB>, AutomaticMapper<ClassA, ClassB>>();

Is there any way that we can tell unity to use a default type mapping that maps from IMapper to AutomaticMapper using the same TSource and TDestination for each of them?

Answer 1

public class AutomaticMapper : IMapper
{
    public TDestination Map<TSource, TDestination>(TSource source)
    {
        return AutoMapper.Mapper.Map<TSource, TDestination>(source);
    }
}

Answer 2

There's an auto registration add-in for Unity that probably does what you want. Have a look at http://unity.codeplex.com/Thread/View.aspx?ThreadId=59418

Answer 3

We actually do almost the same exact thing. In Unity, you can say:

unityContainer.RegisterType(typeof(IMapper<,>), typeof(AutomaticMapper<,>));