Question

我正在创建一个用于预订酒店客房客人的应用程序。我正在尝试在ReservationViewModel包含的列表中编辑来宾。在GET上，我成功地将带有两个空Guest项目的ViewModel传递给View，并在View中创建了编辑器。每当我发回ReservationVM并尝试读取它们时，列表就会显示为空。我已按照建议将我的foreach循环更改为for循环，但这似乎不起作用。该列表似乎是空的，每当尝试从列表中读取但没有任何输出时，我都会尝试打印一条消息。

这是我的GET：

[HttpGet]
    public ActionResult Edit2(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        Reservation reservation = resRepo.GetReservationByID(id);
        ReservationVM reservationVM = new ReservationVM(0);

        for (int i = 0; i < reservation.amount_people; i++)
        {
            reservationVM.guests.Add(new Guest());
        }

        foreach (Guest guest in reservationVM.guests)
        {
            guest.name = " ";
            guest.zipcode = " ";
            guest.housenumber = 0;
            guest.suffix = "";
            guest.email = " ";
            guestRepo.AddGuest(guest);
        }
        guestRepo.Save();

        reservationVM.date = (DateTime)reservation.date;
        reservationVM.amount_people = (int)reservation.amount_people;
        reservationVM.ID = reservation.ID;
        reservationVM.room_ID = (int)reservation.room_ID;

        if (reservation == null)
        {
            return HttpNotFound();
        }
        return View(reservationVM);
    }

这是我的帖子：

[HttpPost]
    public ActionResult Edit2(ReservationVM reservationVM)
    {
        if (ModelState.IsValid)
        {
            //Get reservation
            Reservation reservation = resRepo.GetReservationByID(reservationVM.ID);
            //Update values in model 
            reservation.date = reservationVM.date;
            reservation.amount_people = reservationVM.amount_people;
            reservation.ID = reservationVM.ID;
            reservation.room_ID = reservationVM.room_ID;
            Debug.WriteLine(reservation.ID);
            //Update to DB and save changes
            resRepo.UpdateReservation(reservation);
            resRepo.Save();

            foreach(Guest guest in reservationVM.guests)
            {
                Debug.WriteLine("hello");
                guestRepo.UpdateGuest(guest);
                reservation.Guests.Add(guest);
            }
            guestRepo.Save();

            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(reservationVM);
    }

这是我的看法：

编辑：将ViewModel内部的列表从View传递到ASP.NET MVC中的控制器吗？

Answer 1

您的代码对我来说似乎还可以，请猜测您的操作可能需要添加前缀

[HttpPost]
public ActionResult Edit2([Bind(Include = "guests")]DataReservationVM reservationVM)
{
.....
}

Answer 2

我修复了！谢谢您的帮助。我的问题是绑定。添加了[Bind(Include ="date, amount_people,ID,room_ID,guests")]并为Guest对象创建局部视图似乎有助于绑定。

将ViewModel内部的列表从View传递到ASP.NET MVC中的控制器

2 个答案: