Program.cs

using NLog;
using NLog.Web;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace WebApi
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var logger = LogManager.LoadConfiguration("nlog.config").GetCurrentClassLogger();
            try
            {
                logger.Debug("init main");
                BuildWebHost(args).Run(); 
            }
            catch (Exception ex)
            {
                logger.Error(ex, "Stopped program because of exception");
                throw;
            }
        }

        public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .ConfigureLogging(logging =>
                {
                    logging.ClearProviders();
                    logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
                })
                .UseNLog()
                .Build();
    }
}