C# 如何设置导航属性

我正在尝试在MVC4中设置一个简单的库应用程序

我有以下实体

public class Book
{
    public Book()
    {
        BorrowedBooks = new List<BorrowedBooks>();

    }
    public int Id { get; set; }
    public string Title { get; set; }
    public string Author { get; set; }        
    public virtual ICollection<BorrowedBooks> BorrowedBooks { get; set; }
}
 public class Borrower
{
    public Borrower()
    {
        BorrowedBooks = new List<BorrowedBooks>();
    }
    public int Id { get; set; }
    public string Firstname { get; set; }
    public string Lastname { get; set; }


    public virtual ICollection<BorrowedBooks> BorrowedBooks { get; set; }
}
 public class BorrowedBooks
{
    public int Id { get; set; }
    public int BookId { get; set; }
    public int BorrowerId { get; set; }
    public DateTime DateBorrowed { get; set; }

    public virtual Book Book { get; set; }
    public virtual Borrower Borrower { get; set; }

}

公共课堂教材
{
公共书籍（）
{
借阅图书=新列表（）；
}
公共int Id{get；set；}
公共字符串标题{get；set；}
公共字符串作者{get；set；}
公共虚拟ICollection借阅图书{get；set；}
}
公共类借款人
{
公共借款人（）
{
借阅图书=新列表（）；
}
公共int Id{get；set；}
公共字符串名{get；set；}
公共字符串Lastname{get；set；}
公共虚拟ICollection借阅图书{get；set；}
}
公共类借书
{
公共int Id{get；set；}
public int BookId{get；set；}
公共int借用器ID{get；set；}
公共日期时间日期借用{get；set；}
公共虚拟图书{get；set；}
公共虚拟借用者{get；set；}
}

我设置了2个存储库

 public class BookRepository : IBookRepository
    {
        private List<Book> books = new List<Book>
            {
                new Book { Id = 1, Title = "Queen of the road", Author = "Tricia Stringer", BorrowedBooks = new List<BorrowedBooks>{  new BorrowedBooks {BookId = 1, BorrowerId = 1, DateBorrowed = DateTime.Parse("26/03/2014")}} },
                new Book { Id = 2, Title = "Don't look now", Author = "Paul Jennings" },
                new Book { Id = 3, Title = "Too bold to die", Author = "Ian McPhedran" },
                new Book { Id = 4, Title = "The rosie project", Author = "Graeme Simson" },
                new Book { Id = 5, Title = "In great spirits", Author = "Archie Barwick" },
                new Book { Id = 6, Title = "The vale girl", Author = "Nelika Mcdonald" },
                new Book { Id = 7, Title = "Watching you", Author = "Michael Robotham" },
                new Book { Id = 8, Title = "Stillways", Author = "Steve Bisley" },
            };

        private List<BorrowedBooks> borrowedBooks = new List<BorrowedBooks>
            {
                new BorrowedBooks {BookId = 8, Book = new Book { Id = 8, Title = "Stillways", Author = "Steve Bisley" },   BorrowerId = 2,  DateBorrowed = DateTime.Parse("01/04/2014")},
                new BorrowedBooks {BookId = 6, BorrowerId = 4, DateBorrowed = DateTime.Parse("08/04/2014")},
                new BorrowedBooks {BookId = 2, BorrowerId = 4, DateBorrowed = DateTime.Parse("08/04/2014")},
                new BorrowedBooks {BookId = 1, BorrowerId = 1, DateBorrowed = DateTime.Parse("26/03/2014")},

            };

        public IEnumerable<Book> Search()
        {

            return books;

        }

    }



public class BorrowerRepository : IBorrowerRepository
    {
        private List<Borrower> borrowers = new List<Borrower>
            {
                new Borrower { Id = 1, Firstname = "John", Lastname = "Smith" },
                new Borrower { Id = 2, Firstname = "Mary", Lastname = "Jane" },
                new Borrower { Id = 3, Firstname = "Peter", Lastname = "Parker" },
                new Borrower { Id = 4, Firstname = "Eddie", Lastname = "Brock" },
            };


        public void Add(Borrower borrower)
        {
            this.borrowers.Add(borrower);
        }
    }

公共类图书存储库：IBookRepository
{
私人列表书籍=新列表
{
新书{Id=1，Title=“TheQueen of the road”，Author=“Tricia Stringer”，借阅图书=新列表{new借阅图书{BookId=1，借阅图书Id=1，DateBorrowed=DateTime.Parse（“2014年3月26日”）}，
新书{Id=2，Title=“现在不要看”，Author=“Paul Jennings”}，
新书{Id=3，Title=“太大胆而不死”，Author=“Ian McPhideran”}，
新书{Id=4，Title=“The rosie project”，Author=“Graeme Simson”}，
新书{Id=5，Title=“精神振奋”，Author=“Archie Barwick”}，
新书{Id=6，Title=“山谷女孩”，Author=“Nelika Mcdonald”}，
新书{Id=7，Title=“看着你”，Author=“Michael Robotham”}，
新书{Id=8，Title=“Stillways”，Author=“Steve Bisley”}，
};
私有列表借阅图书=新列表
{
新借来的书{BookId=8，Book=newbook{Id=8，Title=“Stillways”，Author=“Steve Bisley”}，借来的书Id=2，DateBorrowed=DateTime.Parse（“01/04/2014”）}，
新借阅图书{BookId=6，BorrowerId=4，DateBorrowed=DateTime.Parse（“08/04/2014”）}，
新借阅的图书{BookId=2，BorrowerId=4，DateBorrowed=DateTime.Parse（“08/04/2014”）}，
新借阅图书{BookId=1，BorrowerId=1，DateBorrowed=DateTime.Parse（“26/03/2014”）}，
};
公共IEnumerable搜索（）
{
还书；
}
}
公共类借用存储：IBorrowerRepository
{
私人名单借款人=新名单
{
新借款人{Id=1，Firstname=“John”，Lastname=“Smith”}，
新借款人{Id=2，Firstname=“Mary”，Lastname=“Jane”}，
新借款人{Id=3，Firstname=“Peter”，Lastname=“Parker”}，
新借款人{Id=4，Firstname=“Eddie”，Lastname=“Brock”}，
};
公共无效添加（借款人）
{
本.借款人.新增（借款人）；
}
}

如何将属性链接在一起？也就是说，在我的BorrowerRepository搜索方法中，它返回所有数据，但账面价值只是一个ID，如何将其与图书存储库中的值链接

---

我的导航属性设置错误了吗？还是我设置存储库数据的方式？

实现这一点的一种方法是添加一个静态类，将数据集合保存在内存中。 然后，在每个存储库中，您将任何与数据相关的操作委托给数据存储中的相应集合，并可以使用

Linq

执行查询

 public static class DataStore
{
    private static List<Book> books = new List<Book>
        {
            new Book { Id = 1, Title = "Queen of the road", Author = "Tricia Stringer", BorrowedBooks = new List<BorrowedBooks>{  new BorrowedBooks {BookId = 1, BorrowerId = 1, DateBorrowed = DateTime.Parse("26/03/2014")}} },
            new Book { Id = 2, Title = "Don't look now", Author = "Paul Jennings" },
            new Book { Id = 3, Title = "Too bold to die", Author = "Ian McPhedran" },
            new Book { Id = 4, Title = "The rosie project", Author = "Graeme Simson" },
            new Book { Id = 5, Title = "In great spirits", Author = "Archie Barwick" },
            new Book { Id = 6, Title = "The vale girl", Author = "Nelika Mcdonald" },
            new Book { Id = 7, Title = "Watching you", Author = "Michael Robotham" },
            new Book { Id = 8, Title = "Stillways", Author = "Steve Bisley" },
        };

    private static List<BorrowedBooks> borrowedBooks = new List<BorrowedBooks>
        {
            new BorrowedBooks {BookId = 8, Book = new Book { Id = 8, Title = "Stillways", Author = "Steve Bisley" },   BorrowerId = 2,  DateBorrowed = DateTime.Parse("01/04/2014")},
            new BorrowedBooks {BookId = 6, BorrowerId = 4, DateBorrowed = DateTime.Parse("08/04/2014")},
            new BorrowedBooks {BookId = 2, BorrowerId = 4, DateBorrowed = DateTime.Parse("08/04/2014")},
            new BorrowedBooks {BookId = 1, BorrowerId = 1, DateBorrowed = DateTime.Parse("26/03/2014")},

        };

    private static List<Borrower> borrowers = new List<Borrower>
        {
            new Borrower { Id = 1, Firstname = "John", Lastname = "Smith" },
            new Borrower { Id = 2, Firstname = "Mary", Lastname = "Jane" },
            new Borrower { Id = 3, Firstname = "Peter", Lastname = "Parker" },
            new Borrower { Id = 4, Firstname = "Eddie", Lastname = "Brock" },
        };

    public static List<Book> Books { get { return books; } }
    public static List<BorrowedBooks> BorrowedBooks { get { return borrowedBooks; } }
    public static List<Borrower> Borrowers { get { return borrowers; } }
}

public class BookRepository : IBookRepository
{
    public IEnumerable<Book> Search()
    {

        return DataStore.Books.Where (b => b.Author == "Paul Jennings");
    }
}

public class BorrowerRepository : IBorrowerRepository
{
    public void Add(Borrower borrower)
    {
        DataStore.Borrowers.Add(borrower);
    }
} 

公共静态类数据存储
{
私有静态列表书籍=新列表
{
新书{Id=1，Title=“TheQueen of the road”，Author=“Tricia Stringer”，借阅图书=新列表{new借阅图书{BookId=1，借阅图书Id=1，DateBorrowed=DateTime.Parse（“2014年3月26日”）}，
新书{Id=2，Title=“现在不要看”，Author=“Paul Jennings”}，
新书{Id=3，Title=“太大胆而不死”，Author=“Ian McPhideran”}，
新书{Id=4，Title=“The rosie project”，Author=“Graeme Simson”}，
新书{Id=5，Title=“精神振奋”，Author=“Archie Barwick”}，
新书{Id=6，Title=“山谷女孩”，Author=“Nelika Mcdonald”}，
新书{Id=7，Title=“看着你”，Author=“Michael Robotham”}，
新书{Id=8，Title=“Stillways”，Author=“Steve Bisley”}，
};
私有静态列表借阅图书=新列表
{
新借来的书{BookId=8，Book=newbook{Id=8，Title=“Stillways”，Author=“Steve Bisley”}，借来的书Id=2，DateBorrowed=DateTime.Parse（“01/04/2014”）}，
新借阅图书{BookId=6，BorrowerId=4，DateBorrowed=DateTime.Parse（“08/04/2014”）}，
新借阅的图书{BookId=2，BorrowerId=4，DateBorrowed=DateTime.Parse（“08/04/2014”）}，
新借阅图书{BookId=1，BorrowerId=1，DateBorrowed=DateTime.Parse（“26/03/2014”）}，
};
私有静态列表借款人=新列表
{
新借款人{Id=1，Firstname=“John”，Lastname=“Smith”}，
新借款人{Id=2，Firstname=“Mary”，Lastname=“Jane”}，
新借款人{Id=3，Firstname=“Peter”，Lastname=“Parker”}，
新借款人{Id=4，Firstname=“Eddie”，Lastname=“Brock”}，
};
公共静态列表书籍{get{return Books；}}
公共静态列表借阅图书{获取{返回借阅图书；}
公共静态列表借款人{get{return借款人；}}
}
公共类图书存储库：IBookRepository
{
公共IEnumerable搜索（）
{
返回DataStore.Books.Where（b=>b.Author==“Pau