Question

我的问题是：我有两个桌子的房间和预订。它们与RoomReservation表中的许多对象有关。

public class Room
    {
public int Id { get; set; }
public double CostNight { get; set; }
public virtual ICollection<Reservation> Reservation { get; set; }
}

public class Reservation
    {
public int Id { get; set; }
public string DateOfEntry { get; set; }
public int NumberOfNights { get; set; }
public virtual ICollection<Room> Room { get; set; }
}

在我的DbContext上我配置了这个：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
            modelBuilder.Entity<Reservation>().HasMany(c => c.Room)
                .WithMany(s => s.Reservation)
                .Map(t => t.MapLeftKey("RoomId")
                    .MapRightKey("ReservationId")
                    .ToTable("RoomReservation"));
        }

按下按钮后，我将数据保存到数据库中：

public ActionResult Reservation(int number, string date, int roomid)
        {
                var reserv = new Reservation
            {
                NumberOfNights = number,
                DateOfEntry = date
            };
                    db.Reservation.Add(reserv);
                    db.SaveChanges();
}

如何将数据保存到RoomReservation表中？

Answer 1

您需要从数据库中检索Room的实例：

 List<Room> selectedRooms = db.Rooms.Where(r => r.RoomId == roomid).ToList();

 var reserv = new Reservation
 {
     NumberOfNights = number,
     DateOfEntry = date,
     Room = selectedRooms 
 };
 db.Reservation.Add(reserv);
 db.SaveChanges();

保存数据多对多关系

1 个答案: