using System;

using Microsoft.Extensions.DependencyInjection;

using System.Threading.Tasks;

using System.Net.Http;

​

public class Program

{

    public static async Task Main()

    {

        var services = new ServiceCollection();

        services.AddHttpClient<IMyClass, MyClass>(i =>

        {

            i.BaseAddress = new Uri("https://google.com"); //breakpoint here never stops

            Console.WriteLine("I was here!");

        });

        var service = services.BuildServiceProvider().GetRequiredService<IMyClass>();

        await service.DownloadAsync();

    }

}

​

public class MyClass : IMyClass

{

    private HttpClient _client;

    public MyClass(HttpClient client)

    {

        _client = client;

    }

​

    public async Task DownloadAsync()

    {

        var results = await _client.GetAsync("/");

        Console.WriteLine("I downloaded something!");

    }

}

​

public interface IMyClass

{

    Task DownloadAsync();

}