EntityType 没有定义键，尽管使用 [Key]

Question

我正在我的应用程序中配置上下文。这些是抛出期望：

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.

我的书 class 看起来像这样：

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

使用反射检测 PropertyInfo 实例时，必须将所有内容都提供给 EntityFramework，仅使用那些 public.You 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; }
}

EntityType 没有定义键，尽管使用 [Key]

EntityType has no key defined, despite using [Key]

c#

entity-framework

dbset