尽管使用[Key]，EntityType没有定义键

Question

我正在我的应用程序中配置上下文。这些都是投掷：

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

看起来像这样：

BookList.Models.Book: : EntityType 'Book' has no key defined. Define the key      for this EntityType.
Books: EntityType: EntitySet 'Books' is based on type 'Book' that has no keys defined. 

My Book课程如下所示：

public class Book
{
    [Display(Name = "Id:")]
    [Key]
    private int BookId { get; set; }

    [Display(Name = "Title:")]
    [MaxLength(35)]
    [Required]
    private string Title { get; set; }

    [Display(Name = "Description:")]
    [MaxLength(300)]
    private string Description { get; set; }
}

如您所见，有[Key]注释。有什么想法吗？

Answer 1

当使用反射来检测PropertyInfo实例时，必须将所有内容都提供给EntityFramework，只使用那些公共实例。您只需要将BookId属性设置为public：

public class Book
{
    [Display(Name = "Id:")]
    [Key]
    public int BookId { get; set; }

    [Display(Name = "Title:")]
    [MaxLength(35)]
    [Required]
    private string Title { get; set; }

    [Display(Name = "Description:")]
    [MaxLength(300)]
    private string Description { get; set; }
}