using System;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using Microsoft.Extensions.Logging;

public class Program

{

    public static void Main()

    {

        using IHost host = Host.CreateDefaultBuilder()

            .ConfigureLogging((context, logging) =>

            {

                logging.SetMinimumLevel(LogLevel.Trace)

                .AddConfiguration(context.Configuration.GetSection("Logging"))

                .AddConsole()

                .AddDebug();

            })

            .ConfigureServices((context, services) =>

            {

                services.AddTransient<doit>();

            })

            .Build();

        var logger = host.Services.GetService<ILogger<Program>>();

        logger.LogDebug("Debug World");

        logger.LogInformation("Info World");

​

        Console.WriteLine("Hello, World!");

        var myservice = host.Services.GetService<doit>();

        myservice.doingit();

​

    }

}

​

public class doit : Idoit

{

    private readonly ILogger _logger;

    public doit(ILogger<doit> logger) => _logger = logger;

    public void doingit()

    {

        _logger.LogInformation("doing World");

    }

}

​

public interface Idoit

{

    public void doingit();

}