C# 如何在实体框架中更新链接表

我使用的是EF代码优先方法，域模型类为：

 public class WindmillUser
        {
            public WindmillUser()
            {
            AssignedMsos = new Collection<Mso>();
            RepackerHeaders = new Collection<RepackerHeader>();
        }
        public int WindmillUserId {get;set;}
        public string Username { get; set; }
        public RoleType Role { get; set; }
        public string Email { get; set; }
        public bool Active { get; set; }
        public DateTime? LastInteraction { get; set; }
        public string TelephoneNumber { get; set; }
        public virtual ICollection<Mso> AssignedMsos { get; set; }
        public virtual ICollection<RepackerHeader> RepackerHeaders { get; set; }
        public virtual ICollection<WindmillUser> WindmillUserImpersonateParent { get; set; }
        public virtual ICollection<WindmillUser> WindmillUsersImpersonateChild { get; set; }
   }
}

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如果不需要创建WindmillUserImpersonate类，那么如何插入/更新WindmillUserImpersonate表？

如果您有实体WindmillUser用户并希望添加新的父级childUser，则应执行以下操作：

user.WindmillUsersImpersonateChild.Add(childUser);
context.SaveChanges();

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不幸的是，它没有起作用。我必须更改域模型并创建另一个实体WindmillUserImpersonate，然后将其添加到dbcontext类中，作为：modelBuilder.entity（）.HasKey（u=>new{u.WindmillUserImpersonateParentId，u.WindmillUsersImpersonateChildId}）；

public class WindmillUserImpersonate
    {
        public int WindmillUserImpersonateParentId { get; set; }
        public int WindmillUsersImpersonateChildId { get; set; }
        public virtual WindmillUser WindmillUser { get; set; }
    }

user.WindmillUsersImpersonateChild.Add(childUser);
context.SaveChanges();