using Microsoft.Extensions.DependencyInjection;

using System;

​

public class Program

{

    public static void Main(string[] args)

    {

​

        var serviceProvider = new ServiceCollection()

            .AddLogging()

            .AddTransient<IIntService,IntService>()

            .BuildServiceProvider();

        var bar = serviceProvider.GetService<IBarService>();

        bar.DoSomeIntegerWork();

​

        Console.WriteLine("All done!");

    }

}

​

public interface IIntService

{

    void DoThing(int number);

}

​

public interface IBarService

{

    void DoSomeIntegerWork();

}

​

public class BarService : IBarService

{

    private readonly IIntService _intService;

    public BarService(IIntService intService)

    {

        _intService = intService;

    }

​

    public void DoSomeIntegerWork()

    {

        for (int i = 0; i < 10; i++)

        {

            _intService.DoThing(i);

        }

    }

}

​

public class IntService : IIntService

{

    public void DoThing(int number)

    {

      Console.WriteLine($"Writing integer {number}");

    }

}