Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Serilog;
using System.IO;
using System;

namespace IO.Swagger
{
    /// <summary>
    /// Program
    /// </summary>
    public class Program
    {
        /// <summary>
        /// Main
        /// </summary>
        /// <param name="args"></param>
        public static void Main(string[] args)
        {
            // Íàñòðîèòü ëîãèðîâàíèå Serilog ñ êîíôèãóðàöèåé èç appsettings.json
            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json").Build())
                .CreateLogger();

            try
            {
                // Çàïóñê âåá-ïðèëîæåíèÿ
                CreateHostBuilder(args).Build().Run();
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host terminated unexpectedly");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        /// <summary>
        /// Create the web host builder.
        /// </summary>
        /// <param name="args"></param>
        /// <returns>IHostBuilder</returns>
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                })
                .UseSerilog();  // Èíòåãðàöèÿ Serilog ñ õîñòîì
    }
}