MeuDependencyResolver.cs

public class MeuDependencyResolver : IDependencyResolver
{
    private ILookup<Type, object> dependencias;

    public MeuDependencyResolver()
    {
        this.dependencias = Dependencias().ToLookup(x => x.GetType());
    }

    private IEnumerable<object> Depencencias() 
    {
        yield return new DummyDependencia1();
        yield return new DummyDependencia2();
        yield return new DummyDependencia2_2();
    }

    public object GetService(Type serviceType)
    {
        return dependencias[serviceType].FirstOrDefault();
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return dependencias[serviceType];
    }
}