using System;

using Microsoft.Extensions.Logging;

public class Program

{

    public static void Main()

    {

        var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole());

        var l = loggerFactory.CreateLogger("test");

        var a = 5;

        var s = "test";

        object n = null;

        l.LogError("str = {s} int = {a} null = {n}", a, s, n);

        l.LogInformation("end");

        Console.WriteLine("console");

    }

}