Conditional Dependency Resolving in Asp.net core

Question

I am having a 2 controller PayerController and BusinessController. Both Controller constructors takes EntityManager as a parameter which is an abstract class. I would like to resolve Each Manager class depending on the controller I am using.

For PayerController I would like to inject PayerManager class and for BusinessController I would like to inject BusinessManager.

Currentlly I am getting the last Object that has been resolved with EntityManager i.e BusinessManager.

I remember in Ninject we can do conditional injection pretty easily.

This is how current I am resolving the dependency But wont work.

Startup.cs

services.AddScoped(typeof(EntityManager), typeof(PayerManager));
services.AddScoped(typeof(EntityManager), typeof(BusinessManager));

Controllers

public class PayerController
{
   private PayerManager Manager{get;}
   public PayerController(EntityManager entityManager)
   {
      Manager = entityManager as PayerManager;
   }
}

Manager Classes

public class PayerManager : EntityManager
{
    public void MyPayer()
    {
    }  
}

public class BusinessManager : EntityManager
{
    public void MyBusiness()
    {
    }
}

public abstract class EntityManager
{
    public string IAMCommon()
    {
        return "";
    }
}

user_7358385 · Answer

@Maxspan, my suggestion:

Put all interfaces in Contracts folder and this folder inside your Models/Entities folder (Models/Entities folder - Contracts folder)

IEntityManager Interface

namespace WebApplication1.Entities.Contracts
{
    public interface IEntityManager
    {
        //Method signature only
        string IAMCommon();
    }
}

IBusinessManager Interface

namespace WebApplication1.Entities.Contracts
{
    public interface IBusinessManager : IEntityManager
    {
        //Method signature only
        void MyBusiness();
    }
}

IPayerManager Interface

namespace WebApplication1.Entities.Contracts
{
    public interface IPayerManager : IEntityManager
    {
        //Method signature only
        void MyPayer();
    }
}

BusinessManager Concrete Class

using System;
using WebApplication1.Entities.Contracts;

namespace WebApplication1.Entities
{
    public class BusinessManager : IBusinessManager
    {
        //Method signature in IEntityManager
        public string IAMCommon()  //Heritage in IBusinessManager (IBusinessManager : IEntityManager)
        {
            //Implement your code here.
            throw new NotImplementedException();
        }

        //Method signature in IBusinessManager
        public void MyBusiness() 
        {
            //Implement your code here.
            throw new NotImplementedException();
        }
    }
}

PayerManager Concrete Class

using System;
using WebApplication1.Entities.Contracts;

namespace WebApplication1.Entities
{
    public class PayerManager : IPayerManager
    {
        //Method signature in IEntityManager
        public string IAMCommon() //Heritage in IPayerManager (IPayerManager : IEntityManager)
        {
            //Implement your code here.
            throw new NotImplementedException();
        }

        //Method signature in IPayerManager
        public void MyPayer()
        {
            //Implement your code here.
            throw new NotImplementedException();
        }
    }
}

Startup class

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using WebApplication1.Entities;
using WebApplication1.Entities.Contracts;

namespace WebApplication1
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped();
            services.AddScoped();
        }
    }
}

BusinessController

using Microsoft.AspNetCore.Mvc;
using WebApplication1.Entities.Contracts;

namespace WebApplication1.Controllers
{
    public class BusinessController : Controller
    {
        private readonly IBusinessManager _businessManager;

        public BusinessController(IBusinessManager businessManager)
        {
            _businessManager = businessManager;
        }

        public IActionResult Index()
        {
            //Both methods in BusinessManager due to heritage (BusinessManager : IBusinessManager)
            _businessManager.IAMCommon(); 
            _businessManager.MyBusiness();

            return View();
        }
    }
}

PayerController

using Microsoft.AspNetCore.Mvc;
using WebApplication1.Entities.Contracts;

namespace WebApplication1.Controllers
{
    public class PayerController : Controller
    {
        private readonly IPayerManager _payerManager;

        public PayerController(IPayerManager payerManager)
        {
            _payerManager = payerManager;
        }

        public IActionResult Index()
        {
            //Both methods in PayerManager due to heritage (PayerManager : IPayerManager)
            _payerManager.IAMCommon(); 
            _payerManager.MyPayer(); 

            return View();
        }
    }
}

Conditional Dependency Resolving in Asp.net core

3 Answers