Program.cs

using Serilog;
using Serilog.Events;
using Serilog.Templates;
using Serilog.Templates.Themes;

// The initial "bootstrap" logger is able to log errors during start-up. It's completely replaced by the
// logger configured in `AddSerilog()` below, once configuration and dependency-injection have both been
// set up successfully.
Log.Logger = new LoggerConfiguration()
    .WriteTo.Console()
    .CreateBootstrapLogger();

Log.Information("Starting up!");

try
{
    var builder = WebApplication.CreateBuilder(args);

    builder.Services.AddSerilog((services, lc) => lc
        .ReadFrom.Configuration(builder.Configuration)
        .ReadFrom.Services(services)
        .Enrich.FromLogContext()
        .WriteTo.Console(new ExpressionTemplate(
            // Include trace and span ids when present.
            "[{@t:HH:mm:ss} {@l:u3}{#if @tr is not null} ({substring(@tr,0,4)}:{substring(@sp,0,4)}){#end}] {@m}\n{@x}",
            theme: TemplateTheme.Code)));
    
    builder.Services.AddControllersWithViews();

    await using var app = builder.Build();
    
    // Configure the HTTP request pipeline.
    if (!app.Environment.IsDevelopment())
    {
        app.UseExceptionHandler("/Home/Error");
        // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }
    
    // Write streamlined request completion events, instead of the more verbose ones from the framework.
    // To use the default framework request logging instead, remove this line and set the "Microsoft"
    // level in appsettings.json to "Information".
    app.UseSerilogRequestLogging();
    
    app.UseHttpsRedirection();
    app.UseStaticFiles();

    app.UseRouting();

    app.UseAuthorization();

    app.MapControllerRoute(
        name: "default",
        pattern: "{controller=Home}/{action=Index}/{id?}");

    await app.RunAsync();

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