Get a list of all registered objects implementing a certain interface

Question

Consider the following

builder.Register(c => new A());
builder.Register(c => new B());
builder.Register(c => new C());

B

Answer 1

I needed to resolve based on some context. So slight variation...

 builder.RegisterAssemblyTypes(Assembly.GetAssembly(typeof(ISomeStrategy)))
   .Where(t => typeof(ISomeStrategy).IsAssignableFrom(t))
   .AsSelf();

 builder.Register>(c =>
 {
    var types = c.ComponentRegistry.Registrations
      .Where(r => typeof(ISomeStrategy).IsAssignableFrom(r.Activator.LimitType))
      .Select(r => r.Activator.LimitType);

    ISomeStrategy[] lst = types.Select(t => c.Resolve(t) as ISomeStrategy).ToArray();

    return (someEnum) =>
    {
      return lst.FirstOrDefault(x => x.CanProcess(someEnum));
    };
 });

Then for your class using the strategy

 public SomeProvider(Func someFactory)
 {
    _someFactory = someFactory;
 }

 public void DoSomething(SomeType someType)
 {
    var strategy = _someFactory(someType);
    strategy.DoIt();
 }