我得到了 ET 4.1 生成的用户模型 - 我首先制作了数据库：
public partial class User
{
public User()
{
this.Photos = new HashSet<Photo>();
this.Posts = new HashSet<Post>();
this.My_requests = new HashSet<User>();
this.Requests = new HashSet<User>();
this.FriendLeft = new HashSet<User>();
this.FriendRight = new HashSet<User>();
}
public int Id { get; set; }
public string Name { get; set; }
public string Surname { get; set; }
public string Email { get; set; }
public string Project { get; set; }
public string City { get; set; }
public string Street { get; set; }
public string House_number { get; set; }
public string Apartment_number { get; set; }
public string username { get; set; }
public string Zip_code { get; set; }
public virtual ICollection<Photo> Photos { get; set; }
public virtual ICollection<Post> Posts { get; set; }
public virtual ICollection<User> My_requests { get; set; }
public virtual ICollection<User> Requests { get; set; }
public virtual ICollection<User> FriendLeft { get; set; }
public virtual ICollection<User> FriendRight { get; set; }
}
每个“用户”都可以邀请其他“用户”成为他的朋友。因此，当有人邀请您时，他会出现在“请求”中，当您邀请某人时，他会出现在“我的请求”中。该数据存储在“Friend_requests”表中，如下所示：
ProposerId(col1) RecipientId(col2)
并且两列都通过 UserId 与 User 表相关 - 它是多对多的。
我的问题是从“Friend_request”中删除行，因为 EF 没有为我提供该表的上下文，而是生成了之前显示的模型......
我尝试过这样的事情：
User User2 = GetUserInfo(UserId2);
context.Users.Where(u => u.Id.Equals(UserId1)).SingleOrDefault().Requests.Remove(User2);
context.SaveChanges();
但这当然是错误的，它给了我一个错误：
"Can't update EntitySet „Friends_Request”, because it has element DefiningQuery, and in element there is no element , wchich can handle this operation."
And my questions are:
How I can delete and how to add rows to table 'Friend_Requests'?
EDIT:
Table relations:
And in model generated by ET it's:
My_requests -> when User is Proposer
Requests -> when User is Recipient
Still the problem is how to add new "Friend requests" and how to delete them?