EntityType has no key defined, despite using [Key]

Question

I am configuring context in my application. These are throwing expection:

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

It looks like this:

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 class looks like this:

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; }
}

As you see, there's [Key] annotation. Any ideas?

Why is your BookId property private? Try set this property as public. — Jose Rodriguez, Jul 29 '15 at 19:46

score 1 · Accepted Answer · answered Jul 29 '15 at 19:55

Everything must be given to EntityFramework when use reflection to detect PropertyInfo instances, only use those that are public.You just need to set BookId property as 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 has no key defined, despite using [Key]

1 Answers1