EntityType“帖子”没有定义键。 定义此EntityType的键

Question

My model class is

public class posts
{
    [Key]
    public int AuthorId;

    public string author_first_name;
    public string author_last_name;
    public string post_text;
}

I don't understand why it is saying that. Even though i am following the naming conventions and still have inserted the key annotation for safe measure it is still giving me the error.

Answer 1

Please use Properties, not fields when declaring Entities using EntityFramework.

You should have:

public class Post
{
    [Key]
    public int AuthorId { get; set; }

    public string AuthorFirstName { get; set; }
    public string AuthorLastName { get; set; }
    public string PostText { get; set; }
}

When you declare attributes using these Data Annotations they must appear on a public getter.

Give this a whirl and see if it works out for you.