MVC 编译错误：添加分页...？

Question

我目前正在学习 ASP.NET 教程，并且正在尝试将本教程实施到我的项目中。 http://www.asp.net/mvc/overview/getting-started/getting-started-with-ef-using-mvc/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application 我把它们写在我的VS里，按F5 然后我想出了错误说：

CS1061：“PagedList.IPagedList”不包含“Title”的定义，并且找不到接受“PagedList.IPagedList”类型的第一个参数的扩展方法“Title”（您是否缺少 using 指令或程序集参考？）

我在 MoviesController.cs 中的索引方法：

public ActionResult Index(string sortOrder,string currentFilter, string searchString, int? page) {
        ViewBag.CurrentSort = sortOrder;
        ViewBag.IDSortParm = String.IsNullOrEmpty(sortOrder) ? "ID_desc" : "";
        ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
        ViewBag.CurrentFilter = searchString;
        var movies = from m in db.Movies
                                 select m;

        if (searchString != null) {
            page = 1;
        }
        else {
            searchString = currentFilter;
        }

        if (!String.IsNullOrEmpty(searchString)) {
            movies = movies.Where(s => s.Title.Contains(searchString));
        }
        switch (sortOrder) {
            case "ID_desc":
                movies = movies.OrderByDescending(m => m.ID);
                break;
            case "Date":
                movies = movies.OrderBy(m => m.Date);
                break;
            case "date_desc":
                movies = movies.OrderByDescending(m => m.Date);
                break;
            default:    //Name ascending
                movies = movies.OrderBy(m => m.ID);
                break;
        }
        int pageSize = 10;
        int pageNumber = (page ?? 1);
        return View(movies.ToPagedList(pageNumber, pageSize));
        //return View(movies.ToList());
    }

这是我的 Index.cshtml

@model PagedList.IPagedList<MvcMovie.Models.Movie>
@using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />
@{
ViewBag.Title = "For Sale";
}
<h2>For Sale</h2>
<p>
@Html.ActionLink("Post", "Create")
@using (Html.BeginForm("Index", "Movies", FormMethod.Get)) {
<p>
    Search by Title: @Html.TextBox("SearchString", ViewBag.CurrentFilter as string)
    <input type="submit" value="Search" />
</p>
}
</p>

<table class="table">
    <tr>
        <th>
            @Html.ActionLink("ID", "Index", new { sortOrder = ViewBag.IDSortParm, currentFilter = ViewBag.CurrentFilter })
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Title)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Price)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Location)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th>
            @Html.ActionLink("Date", "Index", new { sortOrder = ViewBag.DateSortParm, currentFilter = ViewBag.CurrentFilter })
        </th>
        <th>
            @Html.DisplayNameFor(model => model.ViewCount)
        </th>
        <th></th>
    </tr>

    @foreach (var item in Model) {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.ID)
            </td>
            <td>
                @Html.ActionLink(item.Title, "Details", new { id = item.ID })
                @*@Html.DisplayFor(modelItem => item.Title)*@
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Price)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Location)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Date)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.ViewCount)
            </td>
            <td>
                @Html.ActionLink("Edit", "Edit", new { id = item.ID }) |
                @Html.ActionLink("Delete", "Delete", new { id = item.ID })
            </td>
        </tr>
    }

</table>
<br />
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount

@Html.PagedListPager(Model, page => Url.Action("Index",
    new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))

哇，我刚刚在错误列表中又发现了 5 个错误...

错误 4“PagedList.IPagedList”不包含“Location”的定义，并且找不到接受“PagedList.IPagedList”类型的第一个参数的扩展方法“Location”（您是否缺少 using 指令或程序集参考？） c:\Users\Harry\Documents\Visual Studio 2013\Projects\MvcMovie\MvcMovie\Views\Movies\Index.cshtml 30 41 MvcMovie

错误 5 无法从用法中推断方法“System.Web.Mvc.Html.DisplayNameExtensions.DisplayNameFor(System.Web.Mvc.HtmlHelper, System.Linq.Expressions.Expression>)”的类型参数。尝试明确指定类型参数。 c:\Users\Harry\Documents\Visual Studio 2013\Projects\MvcMovie\MvcMovie\Views\Movies\Index.cshtml 33 6 MvcMovie

我觉得很痛苦，因为我在这里卡了5个多小时哈哈

Answer 1

嗯，你的错误信息是不言自明的。你已经声明了一个 PagedList.IPagedList<MvcMovie.Models.Movie> 类型的模型，但是在你的 Razor 页面中有以下内容：

@Html.DisplayNameFor(model => model.Location)

虽然项目包含在枚举中，但IPagedList<T> 本身不包含属性Location，因此出现错误。

也许您的意思是将上述内容包含在一个循环中，在枚举中获取First() 项，或者创建一个包含IPagedList 和其他属性的封装模型？