如何在ASP.NET MVC 4中正确使用元组

我正在尝试使用元组在一个视图中使用两个模型，但我收到此错误：’/’应用程序中的服务器错误。

传递到字典中的模型项的类型为’PagedList.PagedList 1[S00117372CA3.Product]', but this dictionary requires a model item of type 'System.Tuple 2 [PagedList.IPagedList 1[S00117372CA3.Product],System.Collections.Generic.IEnumerable 1[S00117372CA3.Product]', but this dictionary requires a model item of type 'System.Tuple 1[S00117372CA3.Product],System.Collections.Generic.IEnumerable 1 [S00117372CA3.Order]]’。

描述：执行当前Web请求期间发生未处理的exception。 请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

exception详细信息：System.InvalidOperationException：传递到字典中的模型项的类型为“PagedList.PagedList 1[S00117372CA3.Product]', but this dictionary requires a model item of type 'System.Tuple 2 1[S00117372CA3.Product]', but this dictionary requires a model item of type 'System.Tuple [PagedList.IPagedList 1[S00117372CA3.Product],System.Collections.Generic.IEnumerable 1 [S00117372CA3.Order]]’。

这是我的代码：

  @*@model PagedList.IPagedList*@ @model Tuple<PagedList.IPagedList, IEnumerable> @{ ViewBag.Title = "Index"; } 
Index
 
 @Html.ActionLink("Create New", "Create") 
  @foreach (var item in Model.Item1) {  } 
 
 
 @Html.DisplayNameFor(model => model.Item1[0].ProductName) 
 
 @Html.DisplayNameFor(model => model.Item1[0].Supplier.CompanyName) 
 
 @Html.DisplayNameFor(model => model.Item1[0].Category.CategoryName) 
 
 @Html.DisplayNameFor(model => model.Item1[0].QuantityPerUnit) 
 
 @Html.DisplayNameFor(model => model.Item1[0].UnitPrice) 
 
 @Html.DisplayNameFor(model => model.Item1[0].UnitsInStock) 
 
 @Html.DisplayNameFor(model => model.Item1[0].UnitsOnOrder) 
 
 @Html.DisplayNameFor(model => model.Item1[0].ReorderLevel) 
 
 @Html.DisplayNameFor(model => model.Item1[0].Discontinued) 
 
 
 
 @Html.DisplayFor(modelItem => item.ProductName) 
 
 @Html.DisplayFor(modelItem => item.Supplier.CompanyName) 
 
 @Html.DisplayFor(modelItem => item.Category.CategoryName) 
 
 @Html.DisplayFor(modelItem => item.QuantityPerUnit) 
 
 @Html.DisplayFor(modelItem => item.UnitPrice) 
 
 @Html.DisplayFor(modelItem => item.UnitsInStock) 
 
 @Html.DisplayFor(modelItem => item.UnitsOnOrder) 
 
 @Html.DisplayFor(modelItem => item.ReorderLevel) 
 
 @Html.DisplayFor(modelItem => item.Discontinued) 
 
 @Html.ActionLink("Edit", "Edit", new { id=item.ProductID }) | @Html.ActionLink("Details", "Details", new { id=item.ProductID }) | @Html.ActionLink("Delete", "Delete", new { id=item.ProductID }) 
 
 
 Page @(Model.Item1.PageCount < Model.Item1.PageNumber ? 0 : Model.Item1.PageNumber) of @Model.Item1.PageCount @if (Model.Item1.HasPreviousPage) { @Html.ActionLink("<<", "Index", new { page = 1}) @Html.Raw(" "); @Html.ActionLink("< Prev", "Index", new {page = Model.Item1.PageNumber - 1}) } else{ @:<< @Html.Raw(" "); @:", "Index", new {page = Model.Item1.PageNumber + 1}) @Html.Raw(" "); @Html.ActionLink(">>", "Index", new {page = Model.Item1.PageCount}) } else{ @:Next > @Html.Raw(" ") @:>> } 
 @foreach (var item in Model.Item2) { @Html.Partial("_Orders") } 

这是我的控制器代码：

 var q = (from o in db.Order_Details where o.ProductID == id join ord in db.Orders on o.OrderID equals ord.OrderID orderby o.Quantity descending select ord); var qm = q.Take(3); return PartialView("_Orders", qm.ToList()); 

Answer 1

从本质上讲，您只是尝试将多个模型传递给您的视图。 由于您只能将一种类型传递给视图，因此执行所需操作的方法是将模型包装在视图模型中，然后将其传递给视图。 就像是：

 public class ProductViewModel { public IPagedList Products { get; set; } public IEnumerable Orders { get; set; } } public ActionResult Index() { var model = new ProductViewModel(); model.Products = // ... fetch from database model.Orders = // ... fetch from database return View(model); } 

现在可以对视图模型强类型化视图：

 @model ProductViewModel