Program.cs

using System;
using System.Diagnostics;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Serilog;
using Serilog.Enrichers.Span;

namespace LibraryManagement.API
{
    public static class Program
    {
        public static readonly string Namespace = typeof(Program).Namespace!;
        public static readonly string AppName = Namespace.Substring(Namespace.LastIndexOf('.', Namespace.LastIndexOf('.') - 1) + 1);

        [System.Diagnostics.CodeAnalysis.SuppressMessage(
            "Design",
            "CA1031:Do not catch general exception types",
            Justification = "Top level all exception catcher")]
        public static int Main(string[] args)
        {
            Activity.DefaultIdFormat = ActivityIdFormat.W3C;

            var configuration = GetConfiguration();
            Log.Logger = CreateSerilogLogger(configuration);

            try
            {
                Log.Information("Configuring web host ({ApplicationContext})...", AppName);
                var host = CreateHostBuilder(configuration, args).Build();

                Log.Information("Starting web host ({ApplicationContext})...", AppName);
                host.Run();

                return 0;
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host terminated unexpectedly");
                return 1;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(IConfiguration configuration, string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    webBuilder.UseConfiguration(configuration);
                    webBuilder.UseSerilog();
                });

        private static ILogger CreateSerilogLogger(IConfiguration configuration)
        {
            return new LoggerConfiguration()
                .MinimumLevel.Verbose()
                .Enrich.WithProperty("ApplicationContext", AppName)
                .Enrich.FromLogContext()
                .Enrich.WithSpan()
                .WriteTo.Console()
                .WriteTo.Seq("http://seq")
                .ReadFrom.Configuration(configuration)
                .CreateLogger();
        }

        private static IConfiguration GetConfiguration()
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddEnvironmentVariables();

            return builder.Build();
        }
    }
}