Program.cs

using facturacion;
using facturacion.Services;
using Microsoft.EntityFrameworkCore;
using System.Text.Json.Serialization;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddCors();
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var connectionString = "Data Source=localhost,1433; Initial Catalog=FacturacionDB; user ID=SA; Password=C@m1l1t0; TrustServerCertificate=True";
builder.Services.AddDbContext<FacturacionContext>(options => options.UseSqlServer(connectionString));

builder.Services.AddScoped<IArticleService, ArticleService>();
builder.Services.AddScoped<ICustomerService, CustomerService>();
builder.Services.AddScoped<IInventoryService, InventoryService>();
builder.Services.AddScoped<IInvoiceService, InvoiceService>();
builder.Services.AddScoped<IProductService, ProductService>();
builder.Services.AddScoped<IUserService, UserService>();

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

var app = builder.Build();

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

app.UseHttpsRedirection();

app.UseCors(policy =>
{
  policy.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader();
});

app.UseAuthorization();

app.MapControllers();

app.Run();