.NET 10 e l'attuale release Long-Term Support (LTS) e introduce la validazione nativa per le Minimal API, il supporto OpenAPI 3.1 di default e miglioramenti significativi delle performance. ASP.NET Core combina C# con un'architettura modulare adatta alle applicazioni enterprise. Questa guida copre la creazione di un'API REST pronta per la produzione, dalla configurazione iniziale al deployment.

.NET 10 LTS

.NET 10 sara supportato fino alla fine del 2028. La validazione integrata per le Minimal API, il supporto OpenAPI 3.1 e i miglioramenti al Native AOT lo rendono la scelta ottimale per i nuovi progetti API.

Configurazione del Progetto con .NET 10 CLI

La creazione di un progetto API ASP.NET Core utilizza la CLI .NET per generare una struttura di progetto ottimizzata. La configurazione dei pacchetti NuGet essenziali prepara le basi per lo sviluppo.

bash

# terminal
# Check installed .NET version
dotnet --version
# Expected: 10.0.x

# Create the API project
dotnet new webapi -n ProductApi -o ProductApi
cd ProductApi

# Add essential packages
dotnet add package Microsoft.EntityFrameworkCore.SqlServer
dotnet add package Microsoft.EntityFrameworkCore.Design
dotnet add package Swashbuckle.AspNetCore

Questi comandi creano un progetto API con le dipendenze per Entity Framework Core e la documentazione Swagger. FluentValidation non e piu necessario per la validazione di base in .NET 10.

Program.cscsharp

using Microsoft.EntityFrameworkCore;
using ProductApi.Data;
using ProductApi.Services;

var builder = WebApplication.CreateBuilder(args);

// Configure Entity Framework Core with SQL Server
builder.Services.AddDbContext<AppDbContext>(options =>
    options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));

// Register business services
builder.Services.AddScoped<IProductService, ProductService>();
builder.Services.AddScoped<ICategoryService, CategoryService>();

// Configure controllers with built-in validation (.NET 10)
builder.Services.AddControllers();
builder.Services.AddValidation();

// Configure OpenAPI 3.1 (default in .NET 10)
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(c =>
{
    c.SwaggerDoc("v1", new() { Title = "Product API", Version = "v1" });
});

var app = builder.Build();

// Middleware pipeline
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

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

app.Run();

Il metodo AddValidation() abilita la validazione integrata introdotta in ASP.NET Core 10, eliminando la necessita di librerie di terze parti come FluentValidation per gli scenari comuni.

Modelli Dati e Entity Framework Core 10

I modelli rappresentano le entita di business dell'applicazione. Entity Framework Core gestisce il mapping oggetto-relazionale con configurazione fluent e convenzioni intelligenti.

Models/Product.cscsharp

namespace ProductApi.Models;

public class Product
{
    // Primary key with auto-increment
    public int Id { get; set; }

    // Required properties (non-nullable in C# 14)
    public required string Name { get; set; }
    public required string Description { get; set; }

    // Price with decimal precision
    public decimal Price { get; set; }

    // Stock with default value
    public int StockQuantity { get; set; } = 0;

    // Product status
    public bool IsActive { get; set; } = true;

    // Relationship with Category (foreign key)
    public int CategoryId { get; set; }
    public Category? Category { get; set; }

    // Automatic tracking dates
    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
    public DateTime? UpdatedAt { get; set; }
}

La keyword required garantisce che le proprieta essenziali siano sempre inizializzate durante la creazione.

Models/Category.cscsharp

namespace ProductApi.Models;

public class Category
{
    public int Id { get; set; }

    public required string Name { get; set; }

    // Slug for friendly URLs
    public required string Slug { get; set; }

    public string? Description { get; set; }

    // Inverse navigation: list of products in this category
    public ICollection<Product> Products { get; set; } = new List<Product>();

    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
}

Data/AppDbContext.cscsharp

using Microsoft.EntityFrameworkCore;
using ProductApi.Models;

namespace ProductApi.Data;

public class AppDbContext : DbContext
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
    {
    }

    // DbSets for each entity
    public DbSet<Product> Products => Set<Product>();
    public DbSet<Category> Categories => Set<Category>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // Product entity configuration
        modelBuilder.Entity<Product>(entity =>
        {
            // Index on name for fast search
            entity.HasIndex(p => p.Name);

            // Price precision: 18 digits, 2 decimals
            entity.Property(p => p.Price)
                .HasPrecision(18, 2);

            // Relationship with Category
            entity.HasOne(p => p.Category)
                .WithMany(c => c.Products)
                .HasForeignKey(p => p.CategoryId)
                .OnDelete(DeleteBehavior.Restrict);
        });

        // Category entity configuration
        modelBuilder.Entity<Category>(entity =>
        {
            // Unique slug
            entity.HasIndex(c => c.Slug).IsUnique();

            // Maximum name length
            entity.Property(c => c.Name).HasMaxLength(100);
        });
    }
}

La configurazione Fluent API offre un controllo preciso sullo schema del database generato dalle migrazioni di EF Core.

Entity Framework Core Migrations

Le migrazioni versionano lo schema del database. Eseguire dotnet ef migrations add InitialCreate e poi dotnet ef database update per applicare le modifiche.

DTO e Validazione Integrata in ASP.NET Core 10

I DTO (Data Transfer Objects) separano i modelli di dominio dai dati esposti tramite l'API. ASP.NET Core 10 introduce la validazione integrata con DataAnnotations, eliminando la necessita di librerie di terze parti nella maggior parte dei casi.

DTOs/ProductDtos.cscsharp

using System.ComponentModel.DataAnnotations;

namespace ProductApi.DTOs;

// DTO for product creation with DataAnnotations
public record CreateProductDto(
    [Required(ErrorMessage = "Product name is required.")]
    [MaxLength(200, ErrorMessage = "Name cannot exceed 200 characters.")]
    string Name,

    [Required(ErrorMessage = "Description is required.")]
    [MinLength(10, ErrorMessage = "Description must contain at least 10 characters.")]
    string Description,

    [Range(0.01, 999999.99, ErrorMessage = "Price must be between 0.01 and 999,999.99.")]
    decimal Price,

    [Range(0, int.MaxValue, ErrorMessage = "Stock cannot be negative.")]
    int StockQuantity,

    [Required(ErrorMessage = "A valid category is required.")]
    int CategoryId
);

// DTO for product update
public record UpdateProductDto(
    [MaxLength(200)]
    string? Name,
    string? Description,
    [Range(0.01, 999999.99)]
    decimal? Price,
    [Range(0, int.MaxValue)]
    int? StockQuantity,
    bool? IsActive
);

// DTO for response (read)
public record ProductDto(
    int Id,
    string Name,
    string Description,
    decimal Price,
    int StockQuantity,
    bool IsActive,
    string CategoryName,
    DateTime CreatedAt
);

// DTO for list with pagination
public record ProductListDto(
    int Id,
    string Name,
    decimal Price,
    int StockQuantity,
    bool IsActive,
    string CategoryName
);

L'utilizzo dei record di C# rende i DTO immutabili e concisi, con uguaglianza di valore automatica. La validazione integrata restituisce automaticamente errori 400 strutturati quando la validazione fallisce. Per la preparazione ai colloqui sui pattern ASP.NET Core, consultare la guida Domande di colloquio ASP.NET Core.

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Esplora .NET

Servizi di Business e Layer di Astrazione

Il layer dei servizi incapsula la logica di business e le operazioni sul database, facilitando il testing e la manutenzione.

Services/IProductService.cscsharp

using ProductApi.DTOs;

namespace ProductApi.Services;

public interface IProductService
{
    // Retrieval with pagination
    Task<(IEnumerable<ProductListDto> Items, int TotalCount)> GetAllAsync(
        int page = 1,
        int pageSize = 10,
        string? search = null,
        int? categoryId = null);

    // Retrieval by ID
    Task<ProductDto?> GetByIdAsync(int id);

    // Creation
    Task<ProductDto> CreateAsync(CreateProductDto dto);

    // Update
    Task<ProductDto?> UpdateAsync(int id, UpdateProductDto dto);

    // Deletion
    Task<bool> DeleteAsync(int id);
}

Services/ProductService.cscsharp

using Microsoft.EntityFrameworkCore;
using ProductApi.Data;
using ProductApi.DTOs;
using ProductApi.Models;

namespace ProductApi.Services;

public class ProductService : IProductService
{
    private readonly AppDbContext _context;

    public ProductService(AppDbContext context)
    {
        _context = context;
    }

    public async Task<(IEnumerable<ProductListDto> Items, int TotalCount)> GetAllAsync(
        int page = 1,
        int pageSize = 10,
        string? search = null,
        int? categoryId = null)
    {
        // Build base query
        var query = _context.Products
            .Include(p => p.Category)
            .AsQueryable();

        // Filter by text search
        if (!string.IsNullOrWhiteSpace(search))
        {
            query = query.Where(p =>
                p.Name.Contains(search) ||
                p.Description.Contains(search));
        }

        // Filter by category
        if (categoryId.HasValue)
        {
            query = query.Where(p => p.CategoryId == categoryId.Value);
        }

        // Total count before pagination
        var totalCount = await query.CountAsync();

        // Apply pagination
        var items = await query
            .OrderByDescending(p => p.CreatedAt)
            .Skip((page - 1) * pageSize)
            .Take(pageSize)
            .Select(p => new ProductListDto(
                p.Id,
                p.Name,
                p.Price,
                p.StockQuantity,
                p.IsActive,
                p.Category!.Name))
            .ToListAsync();

        return (items, totalCount);
    }

    public async Task<ProductDto?> GetByIdAsync(int id)
    {
        // Retrieve with category inclusion
        var product = await _context.Products
            .Include(p => p.Category)
            .FirstOrDefaultAsync(p => p.Id == id);

        if (product == null) return null;

        // Map to DTO
        return new ProductDto(
            product.Id,
            product.Name,
            product.Description,
            product.Price,
            product.StockQuantity,
            product.IsActive,
            product.Category?.Name ?? "Uncategorized",
            product.CreatedAt);
    }

    public async Task<ProductDto> CreateAsync(CreateProductDto dto)
    {
        // Create entity
        var product = new Product
        {
            Name = dto.Name,
            Description = dto.Description,
            Price = dto.Price,
            StockQuantity = dto.StockQuantity,
            CategoryId = dto.CategoryId
        };

        // Add and save
        _context.Products.Add(product);
        await _context.SaveChangesAsync();

        // Load category for response
        await _context.Entry(product)
            .Reference(p => p.Category)
            .LoadAsync();

        return new ProductDto(
            product.Id,
            product.Name,
            product.Description,
            product.Price,
            product.StockQuantity,
            product.IsActive,
            product.Category?.Name ?? "Uncategorized",
            product.CreatedAt);
    }

    public async Task<ProductDto?> UpdateAsync(int id, UpdateProductDto dto)
    {
        // Retrieve existing entity
        var product = await _context.Products
            .Include(p => p.Category)
            .FirstOrDefaultAsync(p => p.Id == id);

        if (product == null) return null;

        // Conditional field updates
        if (!string.IsNullOrEmpty(dto.Name))
            product.Name = dto.Name;

        if (!string.IsNullOrEmpty(dto.Description))
            product.Description = dto.Description;

        if (dto.Price.HasValue)
            product.Price = dto.Price.Value;

        if (dto.StockQuantity.HasValue)
            product.StockQuantity = dto.StockQuantity.Value;

        if (dto.IsActive.HasValue)
            product.IsActive = dto.IsActive.Value;

        // Update modification date
        product.UpdatedAt = DateTime.UtcNow;

        await _context.SaveChangesAsync();

        return new ProductDto(
            product.Id,
            product.Name,
            product.Description,
            product.Price,
            product.StockQuantity,
            product.IsActive,
            product.Category?.Name ?? "Uncategorized",
            product.CreatedAt);
    }

    public async Task<bool> DeleteAsync(int id)
    {
        // Direct deletion without prior loading (EF Core 7+)
        var result = await _context.Products
            .Where(p => p.Id == id)
            .ExecuteDeleteAsync();

        return result > 0;
    }
}

L'uso di ExecuteDeleteAsync migliora le performance evitando il caricamento dell'entita prima dell'eliminazione. Per pattern avanzati, consultare la guida Clean Architecture con .NET.

Controller API e Endpoint REST

I controller espongono endpoint REST e orchestrano le chiamate ai servizi di business con una gestione appropriata dei codici di stato HTTP.

Controllers/ProductsController.cscsharp

using Microsoft.AspNetCore.Mvc;
using ProductApi.DTOs;
using ProductApi.Services;

namespace ProductApi.Controllers;

[ApiController]
[Route("api/[controller]")]
[Produces("application/json")]
public class ProductsController : ControllerBase
{
    private readonly IProductService _productService;

    public ProductsController(IProductService productService)
    {
        _productService = productService;
    }

    /// <summary>
    /// Retrieves the list of products with pagination and filters.
    /// </summary>
    [HttpGet]
    [ProducesResponseType(typeof(PaginatedResponse<ProductListDto>), StatusCodes.Status200OK)]
    public async Task<IActionResult> GetAll(
        [FromQuery] int page = 1,
        [FromQuery] int pageSize = 10,
        [FromQuery] string? search = null,
        [FromQuery] int? categoryId = null)
    {
        // Validate pagination parameters
        if (page < 1) page = 1;
        if (pageSize < 1 || pageSize > 100) pageSize = 10;

        var (items, totalCount) = await _productService.GetAllAsync(
            page, pageSize, search, categoryId);

        // Standardized paginated response
        var response = new PaginatedResponse<ProductListDto>
        {
            Items = items,
            Page = page,
            PageSize = pageSize,
            TotalCount = totalCount,
            TotalPages = (int)Math.Ceiling(totalCount / (double)pageSize)
        };

        return Ok(response);
    }

    /// <summary>
    /// Retrieves a product by its identifier.
    /// </summary>
    [HttpGet("{id:int}")]
    [ProducesResponseType(typeof(ProductDto), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public async Task<IActionResult> GetById(int id)
    {
        var product = await _productService.GetByIdAsync(id);

        if (product == null)
        {
            return NotFound(new { message = $"Product with ID {id} not found." });
        }

        return Ok(product);
    }

    /// <summary>
    /// Creates a new product.
    /// </summary>
    [HttpPost]
    [ProducesResponseType(typeof(ProductDto), StatusCodes.Status201Created)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    public async Task<IActionResult> Create([FromBody] CreateProductDto dto)
    {
        // Validation is automatic via AddValidation()
        var product = await _productService.CreateAsync(dto);

        // Returns 201 with the created resource URL
        return CreatedAtAction(
            nameof(GetById),
            new { id = product.Id },
            product);
    }

    /// <summary>
    /// Updates an existing product.
    /// </summary>
    [HttpPut("{id:int}")]
    [ProducesResponseType(typeof(ProductDto), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    public async Task<IActionResult> Update(int id, [FromBody] UpdateProductDto dto)
    {
        var product = await _productService.UpdateAsync(id, dto);

        if (product == null)
        {
            return NotFound(new { message = $"Product with ID {id} not found." });
        }

        return Ok(product);
    }

    /// <summary>
    /// Deletes a product.
    /// </summary>
    [HttpDelete("{id:int}")]
    [ProducesResponseType(StatusCodes.Status204NoContent)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    public async Task<IActionResult> Delete(int id)
    {
        var deleted = await _productService.DeleteAsync(id);

        if (!deleted)
        {
            return NotFound(new { message = $"Product with ID {id} not found." });
        }

        // 204 No Content for successful deletion
        return NoContent();
    }
}

Gli attributi ProducesResponseType documentano i possibili codici di risposta per la generazione automatica della documentazione Swagger.

DTOs/PaginatedResponse.cscsharp

namespace ProductApi.DTOs;

public class PaginatedResponse<T>
{
    public IEnumerable<T> Items { get; set; } = Enumerable.Empty<T>();
    public int Page { get; set; }
    public int PageSize { get; set; }
    public int TotalCount { get; set; }
    public int TotalPages { get; set; }
    public bool HasPreviousPage => Page > 1;
    public bool HasNextPage => Page < TotalPages;
}

Route Constraints

L'uso di vincoli come {id:int} previene conflitti di routing e restituisce automaticamente un 404 se il formato non e corretto.

Middleware di Gestione Globale degli Errori

Un middleware di gestione degli errori centralizza l'elaborazione delle eccezioni per risposte coerenti e sicure.

Middleware/ExceptionMiddleware.cscsharp

using System.Net;
using System.Text.Json;

namespace ProductApi.Middleware;

public class ExceptionMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger<ExceptionMiddleware> _logger;
    private readonly IHostEnvironment _env;

    public ExceptionMiddleware(
        RequestDelegate next,
        ILogger<ExceptionMiddleware> logger,
        IHostEnvironment env)
    {
        _next = next;
        _logger = logger;
        _env = env;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        try
        {
            // Continue pipeline
            await _next(context);
        }
        catch (Exception ex)
        {
            // Log the error
            _logger.LogError(ex, "An unhandled exception occurred");

            // Prepare response
            context.Response.ContentType = "application/json";
            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;

            // Different response based on environment
            var response = _env.IsDevelopment()
                ? new ErrorResponse(
                    StatusCode: context.Response.StatusCode,
                    Message: ex.Message,
                    Details: ex.StackTrace)
                : new ErrorResponse(
                    StatusCode: context.Response.StatusCode,
                    Message: "An internal error occurred.",
                    Details: null);

            // Serialize with camelCase options
            var options = new JsonSerializerOptions
            {
                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
            };

            var json = JsonSerializer.Serialize(response, options);
            await context.Response.WriteAsync(json);
        }
    }
}

// DTO for error responses
public record ErrorResponse(int StatusCode, string Message, string? Details);

// Extension to register middleware
public static class ExceptionMiddlewareExtensions
{
    public static IApplicationBuilder UseExceptionMiddleware(this IApplicationBuilder app)
    {
        return app.UseMiddleware<ExceptionMiddleware>();
    }
}

Program.cs (adding middleware)csharp

var app = builder.Build();

// Exception middleware must be first
app.UseExceptionMiddleware();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}
// ... rest of configuration

Configurazione e Variabili d'Ambiente

La configurazione esternalizzata consente di adattare l'applicazione a diversi ambienti senza modificare il codice.

appsettings.jsonjson

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=localhost;Database=ProductDb;User Id=sa;Password=YourPassword;TrustServerCertificate=true"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning",
      "Microsoft.EntityFrameworkCore": "Warning"
    }
  },
  "ApiSettings": {
    "DefaultPageSize": 10,
    "MaxPageSize": 100,
    "ApiVersion": "1.0"
  }
}

Configuration/ApiSettings.cscsharp

namespace ProductApi.Configuration;

public class ApiSettings
{
    public int DefaultPageSize { get; set; } = 10;
    public int MaxPageSize { get; set; } = 100;
    public string ApiVersion { get; set; } = "1.0";
}

Program.cs (injecting configuration)csharp

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

// Usage in a service
public class ProductService : IProductService
{
    private readonly ApiSettings _settings;

    public ProductService(IOptions<ApiSettings> settings)
    {
        _settings = settings.Value;
    }
}

Test Unitari con xUnit

I test unitari verificano il comportamento di servizi e controller in isolamento.

Tests/ProductServiceTests.cscsharp

using Microsoft.EntityFrameworkCore;
using ProductApi.Data;
using ProductApi.DTOs;
using ProductApi.Models;
using ProductApi.Services;
using Xunit;

namespace ProductApi.Tests;

public class ProductServiceTests
{
    private AppDbContext CreateInMemoryContext()
    {
        // Configure in-memory database
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
            .Options;

        return new AppDbContext(options);
    }

    [Fact]
    public async Task CreateAsync_ValidDto_ReturnsProductDto()
    {
        // Arrange
        using var context = CreateInMemoryContext();

        // Add test category
        var category = new Category { Id = 1, Name = "Electronics", Slug = "electronics" };
        context.Categories.Add(category);
        await context.SaveChangesAsync();

        var service = new ProductService(context);
        var dto = new CreateProductDto(
            Name: "Test Product",
            Description: "Test Description",
            Price: 99.99m,
            StockQuantity: 10,
            CategoryId: 1);

        // Act
        var result = await service.CreateAsync(dto);

        // Assert
        Assert.NotNull(result);
        Assert.Equal("Test Product", result.Name);
        Assert.Equal(99.99m, result.Price);
        Assert.Equal("Electronics", result.CategoryName);
    }

    [Fact]
    public async Task GetByIdAsync_NonExistent_ReturnsNull()
    {
        // Arrange
        using var context = CreateInMemoryContext();
        var service = new ProductService(context);

        // Act
        var result = await service.GetByIdAsync(999);

        // Assert
        Assert.Null(result);
    }

    [Fact]
    public async Task DeleteAsync_ExistingProduct_ReturnsTrue()
    {
        // Arrange
        using var context = CreateInMemoryContext();

        var category = new Category { Id = 1, Name = "Test", Slug = "test" };
        var product = new Product
        {
            Id = 1,
            Name = "To Delete",
            Description = "Will be deleted",
            Price = 10.00m,
            CategoryId = 1
        };

        context.Categories.Add(category);
        context.Products.Add(product);
        await context.SaveChangesAsync();

        var service = new ProductService(context);

        // Act
        var result = await service.DeleteAsync(1);

        // Assert
        Assert.True(result);
        Assert.Null(await context.Products.FindAsync(1));
    }
}

I test si eseguono con dotnet test dalla directory radice del progetto. Per approfondimenti sui pattern di performance EF Core, incluse le strategie di testing, consultare la guida dedicata.

Sources

What's new in ASP.NET Core 10 - Validazione integrata, supporto OpenAPI 3.1
What's new in .NET 10 - Dettagli release LTS, funzionalita C# 14
Entity Framework Core documentation - Aggiornamenti EF Core 10
Announcing .NET 10 - Annuncio ufficiale del rilascio

Checklist per API .NET di Produzione

.NET 10 con ASP.NET Core offre un ecosistema completo e performante per la creazione di API REST professionali. La combinazione di validazione integrata, Entity Framework Core per l'accesso ai dati e dependency injection nativa consente di costruire applicazioni manutenibili e testabili.

Separare i DTO dai modelli di dominio
Implementare un layer di servizi per la logica di business
Utilizzare la validazione integrata con DataAnnotations (.NET 10+)
Configurare il middleware di gestione globale degli errori
Esternalizzare la configurazione con IOptions
Scrivere test unitari per i servizi
Documentare l'API con OpenAPI 3.1

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L'architettura a livelli (Controller, Services, Repository/DbContext) promuove la separazione delle responsabilita e facilita l'evoluzione dell'applicazione. Le funzionalita di .NET 10 come la validazione integrata, il supporto OpenAPI 3.1 di default e il miglioramento del supporto Native AOT modernizzano lo sviluppo delle API migliorando al contempo le performance.

.NET 10: Creare un'API REST con ASP.NET Core