MeuDependencyResolver.cs

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

    public MeuDependencyResolver()
    {
        var dependencias = new [] 
        {
            new DummyDependencia1(), new DummyDependencia2(), new DummyDependencia2_2()
        };

        this.lookup = dependencias.ToLookup(x => x.GetType());
    }

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

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