Question

我在创建合适的ViewModel时遇到问题，允许我允许用户在视图中一次选择多张故障单。

我有一个Ticket模型

 public class Ticket
{
   public int TicketID { get; set; }

   [Required]
   [ForeignKey("Event")]
   //foreign key
    public int EventID { get; set; }

   [Required]
   public string Description { get; set; }

   [Required]
   public float Price { get; set; }

    //navigation property
    public virtual Event Event { get; set; }

}

订单模型

 public class Order
{

    public int OrderID { get; set; }

    //foreign key
    [Required]
    [ForeignKey("Event")]
    public int EventID { get; set; }


    [Required]
    public DateTime OrderDate { get; set; }

    [Required]
    public float OrderTotal { get; set; }

    public ApplicationUser user { get; set; }

    public virtual Event Event { get; set; }
}

然后我有一个OrderDetails模型

public class OrderDetails
{

    [Required]
    public int OrderDetailsID { get; set; }


    [Required]
    //Foreign key
    [ForeignKey("Order")]
    public int OrderID { get; set; }

    [Required]
    //Foreign key
    [ForeignKey("Ticket")]
    public int TicketID { get; set; }

    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    [Required]
    [DataType(DataType.EmailAddress)]
    public string email { get; set; }

    [Required]
    [DataType(DataType.PhoneNumber)]
    public int PhoneNumber { get; set; }

    //navigation properties
    public virtual Order Order { get; set; }

    public virtual Ticket Ticket { get; set; }

}

我还创建了一个额外的TicketsOrdered模型，因为我不知道在哪里我可以保存用户选择的每种票类型的数量

public class TicketsOrdered
{

    public int OrderID;

    public int TicketID;

    public int Quantity;
}

我想创建一个View，它将显示与特定事件相关的每个故障单的故障单描述和价格，然后还会有一个下拉/文本框，允许用户输入他们需要的每个故障单的数量。然后我想将TicketID，OrderID和数量保存到我的TicketsOrdered数据库表。我遇到的问题是所有数据都与很多模型有关，我不知道如何将它们整合在一起。我完全失去了如何实现这一点，我想要它看起来的一个例子就是你在EventBrite上点击预订票。 ViewModel上的任何帮助都可以使用或者如何在View中使用我当前的模型将非常有用，谢谢。

修改事件模型

 public class Event
{
    public int EventID { get; set; }

    [Required]
    public String Name { get; set; }

    [Required]
    public String Location { get; set; }

    [Required]
    [DataType(DataType.Date)]
    public DateTime Date { get; set; }

    [Required]
    [DataType(DataType.MultilineText)]
    public String Description { get; set; }

    [Required]
    [Display(Name = "Total Tickets Available")]
    public int TicketsAvailable { get; set; }

    //navigation property
    public virtual IEnumerable<Order> Order { get; set; }
    //navigation property
    public virtual IEnumerable<Ticket> Tickets { get; set; }

}

Answer 1

首先创建代表您想在视图中显示/编辑的视图模型

public class TicketVM
{
  public int TicketID { get; set; }
  public string Description { get; set; }
  public decimal Price { get; set; }
  public int Quantity { get; set; }
}
public class OrderVM
{
  public int ID { get; set; }
  public int EventID { get; set; }
  public string EventName { get; set; }
  // additional properties of Event you want to display
  public DateTime OrderDate { get; set; }
  public string FirstName { get; set; }
  // additional properties of Order and OrderDetails you want to edit
  public List<TicketVM> Tickets { get; set; }
}

附注：有点不清楚为什么你有Order和OrderDetails的单独模型，或为什么OrderDetails有public int TicketID { get; set; }表明Order可以只有一张票，所以我建议您可能需要对数据库结构进行一些更改。如果用户可以为不同的人订购多张票，那么每个票持有者的姓名，电子邮件和电话应该存储在TicketsOrdered表中（以及添加到TicketVM的那些属性类）

然后视图（假设它为Create方法）

@model TicketVM
@using (Html.BeginForm())
{
  @Html.HiddenFor(m => m.EventID)
  <h2>@Model.EventName</h2>
  // other display properties of event
  @Html.TextBoxFor(m => m.OrderDate)
  @Html.TextBoxFor(m => m.FirstName)
  // other edit control for properties of Order and OrderDetails (see note above)
  @Html.EditorFor(m => m.Tickets)
  <input type="submit" value="Save" />
}

和EditorTemplate TicketVM（/Views/Shared/EditorTemplates/TicketVM.cshtml）

@model TicketVM
@Html.HiddenFor(m => m.TicketID)
@Html.DisplayFor(m => m.Description)
@Html.DisplayFor(m => m.Price)
@Html.TextBoxFor(m => m.Quantity)

然后是控制器方法（注意你没有向你展示Event模型，所以调整以下内容以适应）

public ActionResult Create(int ID) // assumes ID is the ID of the Event
{
  // Get the event and its tickets
  Event e = db.Events.Where(e = e.EventID = ID).Include(e => e.Tickets);
  // Initialize a new order
  OrderVM model = new OrderVM
  {
    EventID = e.EventID,
    EventName = e.EventName,
    // other properties of event as required
    Tickets = e.Tickets.Select(t => new TicketVM
    {
      TicketID = t.TicketID,
      Description = t.Description,
      Price = t.Price
    })
  };
  return View(model);
}
[HttpPost]
public ActionResult Create(OrderVM model)
{
  if (!ModelState.IsValid)
  {
    // repopulate any properties as required
    return View(model);
  }
  // Initialize an Order data model, save it and gets its ID
  Order order = new Order
  {
    OrderDate = model.OrderDate,
    // other properties of Order
  };
  db.Orders.Add(order);
  db.SaveChanges();
  // ditto for OrderDetails (but see notes above)

  // Initialize an TicketsOrdered data model for each valid ticket
  foreach(TicketVM ticket in model.Tickets.Where(t => t.Quantity > 0))
  {
    TicketsOrdered ticketOrder = new TicketsOrdered
    {
      OrderID = order.ID,
      TicketID = ticketOrder.TicketID,
      Quantity = ticketOrder.Quantity
    }
    db.TicketsOrdered.Add(ticketOrder);
  }
  db.SaveChanges();
  return RedirectToAction(...);
}

使用ViewModels和部分视图与asp.net mvc

1 个答案: