How to use Func in built-in dependency injection

Question

Using asp.net 5 I\'d like my controller to be injected with a Funcinstead of T

For example:

Answer 1

I wrote a little extension method that registres the service and the factory (Func):

public static class IServiceCollectionExtension
{
    public static IServiceCollection AddFactory(this IServiceCollection serviceCollection) 
        where TService : class
        where TServiceImplementation : class, TService
    {
        return serviceCollection
            .AddTransient();
            .AddSingleton>(sp => sp.GetRequiredService);
    }
}

Usage:

serviceCollection
   .AddFactory()