MvcBookStore/Models/CategoryRepository.cs

（完整代码） 964B 

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

namespace MvcBookStore.Models
{
    public class CategoryRepository:ICategoryRepository 
    {
       public  IList<Categories> GetAllCategoties()
        {
            using (Models.MvcBookStoreEntities db = new MvcBookStoreEntities())
            {
                return db.Categories.ToList();
            }

        }
        public Categories GetCategoryById(int id)
        {
            using (Models.MvcBookStoreEntities db = new MvcBookStoreEntities())
            {
                return db.Categories.Include("Books").Single(c=> c.CategoryId==id);
            }
        }
        public Books GetBookById(int id)
        {
            using (Models.MvcBookStoreEntities db = new MvcBookStoreEntities())
            {
                return db.Books.Include ("Categories").Single (b=>b.BookId==id );
            }
        }
    }
}

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