如何在虚拟字段中插入值

我有一个学习表，我设置值到一个用户注册，'注册(RegisterViewModel模型)'在AccountController。

 if (result.Succeeded)
            {
                await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);

                using (The_FactoryDBContext db = new The_FactoryDBContext())
                    {
                        Learner learner = new Learner();
                        learner.learnerID = User.Identity.GetUserId();
                        learner.llCounter = 0;
                        learner.dtwCounter = 0;
                        learner.ftwCounter = 0;
                        learner.counter = 0;
                        db.Learners.Add(learner);
                        db.SaveChanges();
                    }
                }
       }

这是我的学习器自动生成类的一些虚拟字段的样子。

public partial class Learner
{
    public Learner()
    {
        this.Learner_Treasure = new HashSet<Learner_Treasure>();
    }
    public string learnerID { get; set; }
    public int llCounter { get; set; }
    public int dtwCounter { get; set; }
    public int ftwCounter { get; set; }
    public int counter { get; set; }
    public virtual AspNetUser AspNetUser { get; set; }
    public virtual ICollection<Learner_Treasure> Learner_Treasure { get; set; }
}

}

然而，我得到这个错误在注册，我不知道如何修复它，有人可以帮助我，或者是我的代码可能在错误的地方?

INSERT语句与外键约束FK_Learner_AspNetUsers1冲突。冲突发生在数据库"The_Factory"，表"dbo"。"AspNetUsers"，列"Id"

类

public partial class AspNetUser
{
    public AspNetUser()
    {
        this.AspNetUserClaims = new HashSet<AspNetUserClaim>();
        this.AspNetUserLogins = new HashSet<AspNetUserLogin>();
        this.AspNetRoles = new HashSet<AspNetRole>();
    }
    public string Id { get; set; }
    public string Email { get; set; }
    public bool EmailConfirmed { get; set; }
    public string PasswordHash { get; set; }
    public string SecurityStamp { get; set; }
    public string PhoneNumber { get; set; }
    public bool PhoneNumberConfirmed { get; set; }
    public bool TwoFactorEnabled { get; set; }
    public Nullable<System.DateTime> LockoutEndDateUtc { get; set; }
    public bool LockoutEnabled { get; set; }
    public int AccessFailedCount { get; set; }
    public string UserName { get; set; }
    public int AvatarID { get; set; }
    public virtual ICollection<AspNetUserClaim> AspNetUserClaims { get; set; }
    public virtual ICollection<AspNetUserLogin> AspNetUserLogins { get; set; }
    public virtual Avatar Avatar { get; set; }
    public virtual Learner Learner { get; set; }
    public virtual ICollection<AspNetRole> AspNetRoles { get; set; }
}

}

[ForeignKey("AspNetUser")]