funcioc.cs

    public class FuncServiceLocator
    {
        Dictionary<Tuple<Type, string>, List<Func<object>>> _registry;

        public void Register(Func<object> factory, Type type, string contract = null)
        {
            var pair = Tuple.Create(type, contract ?? "");
            if (!_registry.ContainsKey(pair)) _registry[pair] = new List<Func<object>>();

            _registry[pair].Add(factory);
        }

        public IEnumerable<object> GetAllServices(Type type, string contract = null)
        {
            var pair = Tuple.Create(type, contract ?? "");
            if (!_registry.ContainsKey(pair)) return Enumerable.Empty<object>();

            return _registry[pair].Select(x => x());
        }
    }