ASP.NET Core

var builder = WebApplication.CreateBuilder(args);

// Configuration des services
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

// Configuration base de données
builder.Services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(
        builder.Configuration.GetConnectionString("DefaultConnection")
    )
);

var app = builder.Build();

// Configuration du pipeline HTTP
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseHttpsRedirection();
app.UseAuthorization();
app.MapControllers();

app.Run();

using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("api/[controller]")]
public class ProductsController : ControllerBase
{
    private readonly IProductService _productService;
    
    public ProductsController(IProductService productService)
    {
        _productService = productService;
    }
    
    // GET: api/products
    [HttpGet]
    public async Task<ActionResult<IEnumerable<Product>>> GetProducts()
    {
        var products = await _productService.GetAllAsync();
        return Ok(products);
    }
    
    // GET: api/products/5
    [HttpGet("{id}")]
    public async Task<ActionResult<Product>> GetProduct(int id)
    {
        var product = await _productService.GetByIdAsync(id);
        
        if (product == null)
            return NotFound();
        
        return Ok(product);
    }
    
    // POST: api/products
    [HttpPost]
    public async Task<ActionResult<Product>> CreateProduct(ProductDto dto)
    {
        var product = await _productService.CreateAsync(dto);
        return CreatedAtAction(nameof(GetProduct), 
            new { id = product.Id }, product);
    }
    
    // PUT: api/products/5
    [HttpPut("{id}")]
    public async Task<IActionResult> UpdateProduct(int id, ProductDto dto)
    {
        var result = await _productService.UpdateAsync(id, dto);
        return result ? NoContent() : NotFound();
    }
    
    // DELETE: api/products/5
    [HttpDelete("{id}")]
    public async Task<IActionResult> DeleteProduct(int id)
    {
        var result = await _productService.DeleteAsync(id);
        return result ? NoContent() : NotFound();
    }
}

public class ApplicationDbContext : DbContext
{
    public ApplicationDbContext(
        DbContextOptions<ApplicationDbContext> options) 
        : base(options)
    {
    }
    
    public DbSet<Product> Products { get; set; }
    public DbSet<Category> Categories { get; set; }
    
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        
        modelBuilder.Entity<Product>(entity =>
        {
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Name)
                  .IsRequired()
                  .HasMaxLength(200);
            entity.Property(e => e.Price)
                  .HasColumnType("decimal(18,2)");
            
            entity.HasOne(p => p.Category)
                  .WithMany(c => c.Products)
                  .HasForeignKey(p => p.CategoryId);
        });
    }
}

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public decimal Price { get; set; }
    public int CategoryId { get; set; }
    public Category Category { get; set; }
    public DateTime CreatedAt { get; set; }
}

public interface IProductService
{
    Task<IEnumerable<Product>> GetAllAsync();
    Task<Product> GetByIdAsync(int id);
    Task<Product> CreateAsync(ProductDto dto);
    Task<bool> UpdateAsync(int id, ProductDto dto);
    Task<bool> DeleteAsync(int id);
}

public class ProductService : IProductService
{
    private readonly ApplicationDbContext _context;
    
    public ProductService(ApplicationDbContext context)
    {
        _context = context;
    }
    
    public async Task<IEnumerable<Product>> GetAllAsync()
    {
        return await _context.Products
            .Include(p => p.Category)
            .ToListAsync();
    }
    
    // Autres méthodes...
}

// Enregistrement des services
builder.Services.AddScoped<IProductService, ProductService>();
builder.Services.AddSingleton<ICacheService, CacheService>();
builder.Services.AddTransient<IEmailService, EmailService>();

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "ConnectionStrings": {
    "DefaultConnection": "Server=localhost;Database=MyDb;Trusted_Connection=True;"
  },
  "JwtSettings": {
    "Secret": "your-secret-key",
    "Issuer": "your-app",
    "Audience": "your-app-users",
    "ExpirationInMinutes": 60
  },
  "AllowedHosts": "*"
}

var jwtSecret = builder.Configuration["JwtSettings:Secret"];
var connectionString = builder.Configuration
    .GetConnectionString("DefaultConnection");

// Options fortement typées
public class JwtSettings
{
    public string Secret { get; set; }
    public string Issuer { get; set; }
    public int ExpirationInMinutes { get; set; }
}

builder.Services.Configure<JwtSettings>(
    builder.Configuration.GetSection("JwtSettings"));

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;

var jwtSettings = builder.Configuration.GetSection("JwtSettings");

builder.Services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme;
})
.AddJwtBearer(options =>
{
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = jwtSettings["Issuer"],
        ValidAudience = jwtSettings["Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(
            Encoding.UTF8.GetBytes(jwtSettings["Secret"]))
    };
});

// Dans le pipeline
app.UseAuthentication();
app.UseAuthorization();

[Authorize]
[ApiController]
[Route("api/[controller]")]
public class SecureController : ControllerBase
{
    [HttpGet]
    [Authorize(Roles = "Admin")]
    public IActionResult GetSecureData()
    {
        var userId = User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
        return Ok(new { Message = "Données sécurisées", UserId = userId });
    }
    
    [HttpGet("public")]
    [AllowAnonymous]
    public IActionResult GetPublicData()
    {
        return Ok(new { Message = "Données publiques" });
    }
}