Program.cs

using csharp_webapi_example.Data;
using csharp_webapi_example.Exceptions;
using csharp_webapi_example.Services;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Versioning;
using Microsoft.EntityFrameworkCore;
using Serilog;

try
{
    var configuration = new ConfigurationBuilder()
        .AddJsonFile("appsettings.json")
        .Build();
    Log.Logger = new LoggerConfiguration()
        .ReadFrom.Configuration(configuration)
        .CreateLogger();
    //Log.Logger = new LoggerConfiguration()
    //    .WriteTo.File("Logs/log.txt", rollingInterval: RollingInterval.Day)
    //    .CreateLogger();

    var builder = WebApplication.CreateBuilder(args);

    // Add services to the container.
    builder.Services.AddControllers();

    // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
    builder.Services.AddEndpointsApiExplorer();
    builder.Services.AddSwaggerGen();

    builder.Services.AddDbContext<AppDbContext>(options =>
      options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

    builder.Services.AddTransient<BookService>();
    builder.Services.AddTransient<AuthorService>();
    builder.Services.AddTransient<PublisherService>(); 
    builder.Services.AddTransient<LogService>();

    builder.Services.AddApiVersioning(config =>
    {
        config.DefaultApiVersion = new ApiVersion(1, 0);
        config.AssumeDefaultVersionWhenUnspecified = true;

        config.ApiVersionReader = new HeaderApiVersionReader("custom-version-header");
    });

    builder.Host.UseSerilog();
    
    var app = builder.Build();
    
    // Configure the HTTP request pipeline.
    if (app.Environment.IsDevelopment())
    {
        app.UseSwagger();
        app.UseSwaggerUI();
    }

    var loggerFactory = app.Services.GetRequiredService<ILoggerFactory>();
    app.ConfigureBuildInExceptionHandler(loggerFactory);
    //app.ConfigureCustomExceptionHandler();

    app.UseHttpsRedirection();

    app.UseAuthorization();

    app.MapControllers();

    //AppDbInitializer.Seed(app); 

    app.Run();
}
catch (Exception ex)
{
    Log.Fatal(ex, "Unhandled Exception");
}
finally
{
    Log.Information("Shut down complete");
    Log.CloseAndFlush();
}