Data Transfer Object

Source : https://www.codeproject.com/Articles/1050468/Data-Transfer-Object-Design-Pattern-in-Csharp

Source : https://docs.microsoft.com/fr-fr/aspnet/web-api/overview/data/using-web-api-with-entity-framework/part-5

Source : https://github.com/MikeWasson/BookService

Analyse par l'exemple

BO utilisés pour Entity Framework

using System.ComponentModel.DataAnnotations;

namespace BookService.Models
{
    public class Book
    {
        public int Id { get; set; }
        [Required]
        public string Title { get; set; }
        public int Year { get; set; }
        public decimal Price { get; set; }
        public string Genre { get; set; }

        // Foreign Key
        public int AuthorId { get; set; }
        // Navigation property
        public Author Author { get; set; }
    }
}

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace BookService.Models
{
    public class Author
    {
        public int Id { get; set; }
        [Required]
        public string Name { get; set; }
    }
}

DTO exposés par l'API :

namespace BookService.Models
{
    public class BookDTO
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string AuthorName { get; set; }
    }
}

namespace BookService.Models
{
    public class BookDetailDTO
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public int Year { get; set; }
        public decimal Price { get; set; }
        public string AuthorName { get; set; }
        public string Genre { get; set; }
    }
}

Context

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;

namespace BookService.Models
{
    public class BookServiceContext : DbContext
    {
        // You can add custom code to this file. Changes will not be overwritten.
        // 
        // If you want Entity Framework to drop and regenerate your database
        // automatically whenever you change your model schema, please use data migrations.
        // For more information refer to the documentation:
        // http://msdn.microsoft.com/en-us/data/jj591621.aspx

        public BookServiceContext() : base("name=BookServiceContext")
        {
            this.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
        }

        public System.Data.Entity.DbSet<BookService.Models.Author> Authors { get; set; }

        public System.Data.Entity.DbSet<BookService.Models.Book> Books { get; set; }

    }
}