Register concrete types against the first interface

Graham Hay

Most of my IoC experience has been using StructureMap, with the default conventions: 

container.Configure(c => c.Scan(s =>
    {
        s.Assembly(GetType().Assembly);
        s.LookForRegistries();
        s.WithDefaultConventions();
    }));

Which registers any components whose name matches the interface, minus the I, e.g. ThingyController : IThingyController, but not DefaultThingyRepository : IThingyRepository.

Recently however, I’ve worked on a few projects using Castle Windsor, whose auto-registration uses the first interface: 

 container.Register(AllTypes
    .FromAssembly(GetType().Assembly)
    .Pick()
    .WithService.FirstInterface()
    .Configure(req => req.LifeStyle.Transient));

What a great idea, I thought! Why can’t I do that with StructureMap? Well the short answer is, you can: 

container.Configure(c => c.Scan(s =>
    {
        s.Assembly(GetType().Assembly);
        s.LookForRegistries();
        s.RegisterConcreteTypesAgainstTheFirstInterface();
    }));

Hurray!

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