How to get registered service by its concrete type instead of its interface type?

Question

Please suppose I have the following classes and interfaces:

public class ConcreteRepository : IRepository<T>, IEntityOwner
{ }

public interface IRepository<T>
{ }

public interface IEntityOwner
{ }

public class SomeModel
{ }

and suppose I have registered the following service in my Asp.Net Core 2.0 startup class:

services.AddScoped<IRepository<SomeModel>, ConcreteRepository>();

I can get the instance of ConcreteRepository like this:

var concreteRepositoryInstance = 
         httpContext.RequestServices.GetService(typeof(IRepository<SomeModel>))
              as IRepository<SomeModel>;

How can I get the instance of ConcreteRepository by the type of ConcreteRepository?

I imagine something like this:

var concreteRepositoryInstance =  
         httpContext.RequestServices.GetService(typeof(ConcreteRepository))
              as IEntityOwner;

Please note that I cannot use any generics to answer my question, because my use case refers to a custom attribute that takes the type of concreteRepository as an input parameter (and attributes cannot be generics by design).

What I tried so far:

(a) I checked and tried all httpContext.RequestServices.GetService... methods but they all require the type of interface with which the concrete type is registered with.

(b) I was thinking about getting all services from the dependency container, but IServiceProvider does not offer getting all services. I can only get them by the type of interface.

Answer 1

Try registering type directly like so

public void ConfigureServices(IServiceCollection services)
{
    // container will create the instance of this type
    services.AddScoped<ConcreteRepository>();
}

Then you will be able to resolve type directly with

var concreteRepositoryInstance =  
         httpContext.RequestServices.GetService(typeof(ConcreteRepository))
              as IEntityOwner;