using System;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Logging;

​

var serviceProvider = new ServiceCollection()

//      .AddLogging(configure => configure.AddConsole())

    .AddLogging(configure => configure.AddJsonConsole())

    .BuildServiceProvider();

var loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();

var logger = loggerFactory.CreateLogger("mylogger");

Console.WriteLine("1");

logger.LogError ("Hello {なにか}", "world");