c# - 列名称无效。该名称从未在代码中实现

Question

我有一个简单的程序，我正在设置它以用于单元测试。出于某种原因，Entity Framework 对我大喊大叫，并出现以下错误:Invalid column name 'Author_Id'.

问题是我没有名为 Author_Id 的列，该列不在项目中，不在模型中，也不在数据库的表中。出于某种原因，它将 _Id 部分添加到我搜索的内容的末尾。

示例:如果我将其设置为搜索 Author，我会得到 Author_Id。 AuthorId 变为 AuthorId_Id，Author_Id 变为 Author_Id_Id。

我不知道我在这里做错了什么。我搜索了整个解决方案，但一无所获。

它告诉我我的错误在这里:

public ViewResult Index()
{
    var books = db.Books.Include(b=>b.AuthorId);
    ViewBag.AlbumCount = books.Count();
    return View(books.OrderBy(b => b.Author.Id).ToList());
    //^^^^ Return is supposed to be doing the error. Fetching Name or 
}

我的作者模型是这样的:

public class Author
{
    [Key]
    public int Id { get; set; }

    [Display(Name = "Author")]
    public string Name { get; set; }

    [Display(Name = "Date of birth")]
    public DateTime? DateOfBirth { get; set; }

    [Display(Name = "Date of death")]
    public DateTime? DateOfDeath { get; set; }

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

我的书本模型是这样的:

public class Book
{
    [Key]
    public int Id { get; set; }

    [Display(Name = "Select author")]
    public Author AuthorId { get; set; }

    [Required]
    public string Title { get; set; }

    [Display(Name = "Publication date")]
    public DateTime? PublicationDate { get; set; }

    public float? Edition { get; set; }

    public Author Author { get; set; }
}

Answer 1

您有两个导航属性，而不是一个导航属性和一个外键属性。

不应该这样:

public class Book
{
    [Key]
    public int Id { get; set; }

    [Display(Name = "Select author")]
    public Author AuthorId { get; set; }

    [Required]
    public string Title { get; set; }

    [Display(Name = "Publication date")]
    public DateTime? PublicationDate { get; set; }

    public float? Edition { get; set; }

    public Author Author { get; set; }
}

成为

public class Book
{
    [Key]
    public int Id { get; set; }

    [Display(Name = "Select author")]
    public int AuthorId { get; set; }

    [Required]
    public string Title { get; set; }

    [Display(Name = "Publication date")]
    public DateTime? PublicationDate { get; set; }

    public float? Edition { get; set; }

    [ForeignKey("AuthorId")]
    public Author Author { get; set; }
}

?