Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Serilog;

namespace Sample
{
    public static class Program
    {
        public static int Main(string[] args)
        {
            // The initial "bootstrap" logger is able to log errors during start-up. It's completely replaced by the
            // logger configured in `UseSerilog()` below, once configuration and dependency-injection have both been
            // set up successfully.
            Log.Logger = new LoggerConfiguration()
                .WriteTo.Console()
                .CreateBootstrapLogger();
            
            Log.Information("Starting up!");

            try
            {
                CreateHostBuilder(args).Build().Run();

                Log.Information("Stopped cleanly");
                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "An unhandled exception occured during bootstrapping");
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .UseSerilog((context, services, configuration) => configuration
                    .ReadFrom.Configuration(context.Configuration)
                    .ReadFrom.Services(services)
                    .Enrich.FromLogContext()
                    .WriteTo.Console())
                .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
    }
}