Program.cs

using System.Text.Json.Serialization;
using BookStore;
using BookStore.Data;
using BookStore.Interfaces;
using BookStore.Repositories;
using BookStore.Services;
using dotenv.net;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();
builder.Services.AddControllers().AddJsonOptions(options =>
{
    options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
});

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

DotEnv.Load();
builder.Services.AddDbContext<DataContext>(options =>
{
    options.UseSqlServer(Environment.GetEnvironmentVariable("DB_CONNECTION_STRING"));
});

builder.Services.AddScoped<IBookRepository, BookRepository>();
builder.Services.AddScoped<IBookService, BookService>();
builder.Services.AddScoped<IGenreRepository, GenreRepository>();
builder.Services.AddScoped<IGenreService, GenreService>();

builder.Services.AddTransient<Seed>();

var app = builder.Build();

if (args.Length == 1 && args[0].ToLower() == "seed")
    Seed(app);

static void Seed(IHost app)
{
    var scopedFactory = app.Services.GetService<IServiceScopeFactory>();
    using var scope = scopedFactory?.CreateScope();
    scope?.ServiceProvider.GetService<Seed>()?.SeedContext();
}

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();

app.UseAuthorization();

app.MapControllers();

app.Run();