// @nuget: EntityFramework

// @nuget: EntityFramework.SqlServerCompact

// @nuget: Microsoft.SqlServer.Compact

// @nuget: Z.EntityFramework.Extensions

​

using System;

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations.Schema;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        // Custom configuration specific for .NET Fiddle

        Z.EntityFramework.Extensions.EntityFrameworkManager.UseFiddleSqlCompact(System.Data.Entity.SqlServerCompact.SqlCeProviderServices.Instance, System.Data.SqlServerCe.SqlCeProviderFactory.Instance);

        using (var context = new BookStore())

        {

            Category category1 = new Category()

            {

                CategoryName = "category 1",

            };

            Category category2= new Category()

            {

                CategoryName = "category 2",

            };

            Book book1 = new Book()

            {

                Title = "MyBook 1",

                Categories = new List<Category>()

                {

                    category1,

                    category2

                }

            };

            Book book2 = new Book()

            {

                Title = "MyBook 2",

                Categories = new List<Category>()

                {

                    category1

                }

            };

            context.Books.Add(book1);

            context.Books.Add(book2);

​

            context.SaveChanges();

            var categories = context.Categories.ToList();

            var books = context.Books.ToList();

​

            FiddleHelper.WriteTable(books);

            FiddleHelper.WriteTable(categories);

​

        }

    }

    public class BookStore : DbContext

    {

        public BookStore() : base(@"Data Source=ZZZ_Projects.sdf")

        {

        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            modelBuilder.Entity<Book>()

                .HasMany(b => b.Categories)

                .WithMany(c => c.Books)

                .Map(cs =>

                {

                    cs.MapLeftKey("BookId");

                    cs.MapRightKey("CategoryId");

                    cs.ToTable("BookCategories");

                });

        }

​

        public DbSet<Category> Categories { get; set; }

        public DbSet<Book> Books { get; set; }

    }

​

    public class Book

    {

        public int BookId { get; set; }

        public string Title { get; set; }

        public virtual ICollection<Category> Categories { get; set; }

    }

​

    public class Category

    {

        public int CategoryId { get; set; }

        public string CategoryName { get; set; }

        public virtual ICollection<Book> Books { get; set; }

    }

}