我在通过操作链接传递id参数时遇到麻烦。我想在我的视图中添加一个取消按钮，这将使eventID返回该方法，对数据库做一些操作，然后重定向到另一个视图。我已经进入调试模式，当返回到方法时，id参数为null，我不明白为什么。
这是我创建初始视图的控制器方法
public ActionResult Create(OrderVM model)
{
//get the currentUser ID to search database for user
string currentUserId = User.Identity.GetUserId();
int quantity = 10;
ApplicationUser currentUser = db.Users.Find(currentUserId);
Order order = new Order
{
OrderDate = DateTime.UtcNow,
EventID = model.EventID,
Event = currentEvent,
user = currentUser
};
//add this order to the database
db.Orders.Add(order);
//save changes to database
db.SaveChanges();
SummaryVm summaryVm = new SummaryVm
{
email = order.user.Email,
orderID = order.OrderID,
tickets = model.Tickets,
totalPrice = total,
ticketQuantity = quantity,
orderDate = order.OrderDate,
eventID = model.EventID,
};
return View("OrderSummary", summaryVm);
}
这是OrderSummary视图
@model Site.ViewModels.SummaryVm
<head>
<title>Next Page</title>
</head>
<header>
<h2> Here is your order summary, please review before proceeding with payment. Please complete this transaction within 15 minutes or your order will be cancelled. </h2>
</header>
<div class="float-left">
<h2 id="countdown"></h2>
</div>
<div id="content">
<div class="panel panel-default">
<div class="panel-heading">Order Summary</div>
<div class="panel-body">
<table class="table">
<thead>
<tr>
<th>Ticket Type</th>
<th><span contenteditable>Price</span></th>
<th><span contenteditable>Quantity</span></th>
</tr>
</thead>
<tbody>
@foreach (GeoSocietySite.ViewModels.TicketVm ticket in @Model.tickets)
{
<tr>
<td><span contenteditable>@ticket.Description</span></td>
<td><span contenteditable>@ticket.Price</span></td>
<td><span contenteditable>@ticket.Quantity</span></td>
</tr>
}
</tbody>
</table>
<table id="total-table">
<tr>
<th>Total Price in £: </th>
<td id="custom-amount">@Model.totalPrice</td>
</tr>
</table>
</div>
</div>
</div>
@Html.ActionLink("Cancel", "CancelOrder", "Order", new { id = @Model.eventID })
这是我的CancelOrder控制器方法
public ActionResult CancelOrder(int eventID)
{
//do something to db
return RedirectToAction("CreateOrder", "Order", new { id = eventID });
}
这是我的创建订单方法
public ActionResult CreateOrder(int? id)
{
Event currentEvent = db.Events.Find(id);
//check event exists
if (currentEvent != null)
{
//get the ID of the user currently logged in to the site
string currentUserId = User.Identity.GetUserId();
//retreive details of current user from db based on ID
ApplicationUser currentUser = db.Users.FirstOrDefault(x => x.Id == currentUserId);
// Initialize a new order
OrderVM model = new OrderVM
{
EventID = currentEvent.EventID,
EventName = currentEvent.Name,
OrderDate = DateTime.Now,
FirstName = currentUser.FirstName,
EventDate = currentEvent.Date,
EventDescription = currentEvent.Description,
EventLocation = currentEvent.Location,
//create view model for each ticket type then place in list
Tickets = currentEvent.Tickets.Select(t => new TicketVm
{
TicketID = t.TicketID,
Description = t.Description,
Price = t.Price
}).ToList(),
};
return View(model);
}else
{
return RedirectToAction("Index", "Events");
}
}
当我尝试运行此代码时，我将重定向到“事件索引”页面，这意味着尚未从数据库中检索到该事件，并且通过调试，我可以看到这是因为ID参数为null。我已经检查了将summaryVm传递给OrderSummary视图时，它已完全填充了数据。如果有人看到我在做什么错，将非常感谢您的帮助。谢谢！
您使用了错误的重载ActionLink（以及您的添加htmlAttributes，而不是路由值）。此外，方法中的参数名为eventID，而不是id。更改为
@Html.ActionLink("Cancel", "CancelOrder", "Order", new { eventID = Model.eventID }, null)
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