C# 在EF Core 2中处理多对多关系时执行CRUD操作

我目前正在读一个博客，其中有一个关于asp.NETCore中书籍和作者的多对多关系的例子

public class Book               
{
    public int BookId { get; set; }   
    public string Title { get; set; }    
    public string Description { get; set; }
    public List<BookAuthor> AuthorLink { get; set; }
}

public class Author               
{
    public int AuthorId { get; set; }   
    public string Name { get; set; }    
    public List<BookAuthor> { get; set; }
}

public class BookAuthor               
{
    public int BookId { get; set; }   
    public int AuthorId { get; set; } 

    public Book Book { get; set; }    
    public Author Author { get; set; }
}

插入方法写为：

var book = new Book
{
  Title = "Quantum Networking",
  Description = "faster-than-light data communications",
  PublishedOn = new DateTime(2057, 1, 1),
  Price = 220
};
var author = new Author { Name = "Future Person" };
book.AuthorsLink = new List<BookAuthor>
{
  new BookAuthor {  // WHAT IF THERE ARE MULTIPLE AUTHORS?
    Author = author, 
    Book = book,
    Order = 0
  }
};

---

如何插入多个逗号分隔的作者？我是否应该在书中使用foreach循环。AuthorLink

现在您已经扩展了作为解决方案一部分的模型！，您可以使用列表初始值设定项初始化列表：

book.AuthorsLink = new List<BookAuthor>
{
  new BookAuthor {
    Author = author, 
    Book = book,
    Order = 0
  },
  new BookAuthor {
    Author = author2, 
    Book = book,
    Order = 0
  },
  new BookAuthor {
    Author = author3, 
    Book = book,
    Order = 0
  }
};

---

或者只是初始化空列表，然后初始化一系列book.AuthorsLink.AddsomeAuthor

否否，您必须更改模型。目前，它不支持多个作者。编辑类，可能支持数组或authors@Attersson很抱歉我只是添加了完整的模型，以避免混淆。我添加了完整的答案，请注意，这不是混淆的问题，而是解决方案本身的一部分：我还更正了第6行，但请检查类书中的字段，它们与您的代码段不同。例如，发布者不存在，订单也不存在。