using System;

using System.Linq;

using Microsoft.Extensions.DependencyInjection;

public class Program

{

    public static void Main()

    {

        var sc = new ServiceCollection();

        sc.AddScoped<Test>();

        sc.AddScoped<Test>();

        sc.AddKeyedScoped<Test>("erik");

        sc.AddKeyedScoped<Test>("erik");

        var sp = sc.BuildServiceProvider();

        using (var scope = sp.CreateScope())

        {

            var a = sp.GetService<Test>();

            var b = sp.GetService<Test>();

            Console.WriteLine("----");

            var c = sp.GetServices<Test>();

            Console.WriteLine(c.Count());

​

            Console.WriteLine("----");

            var d = sp.GetKeyedService<Test>("erik");

            Console.WriteLine("----");

            var e = sp.GetKeyedServices<Test>("erik");

            Console.WriteLine(e.Count());

​

        }

    }

}

​

public class Test

{

    private readonly Guid id = Guid.NewGuid();

    public Test()

    {

        Console.WriteLine($"Test: {id}");

    }

}