How to register multiple implementations of the same interface in Asp.Net Core?

Question

I have services that are derived from the same interface.

public interface IService { }
public class ServiceA : IService { }
public class ServiceB : IService         


        

Answer 1

Another option is to use the extension method GetServices from Microsoft.Extensions.DependencyInjection.

Register your services as:

services.AddSingleton();
services.AddSingleton();
services.AddSingleton();

Then resolve with a little of Linq:

var services = serviceProvider.GetServices();
var serviceB = services.First(o => o.GetType() == typeof(ServiceB));

or

var serviceZ = services.First(o => o.Name.Equals("Z"));

(assuming that IService has a string property called "Name")

Make sure to have using Microsoft.Extensions.DependencyInjection;

Update

AspNet 2.1 source: GetServices