ASP.NET MVC不包含'PagedListPager'的定义

我试图将Pagination功能插入到其他公司的现有应用程序构建中 . 我在cshtml上遇到错误：

编译器错误消息：CS1928：'System.Web.Mvc.HtmlHelper>'不包含'PagedListPager'的定义和最佳扩展方法重载'PagedList.Mvc.HtmlHelper.PagedListPager（System.Web.Mvc.HtmlHelper，PagedList .IPagedList，System.Func）'有一些无效的参数

来源错误：

编译器错误消息：CS1928：'System.Web.Mvc.HtmlHelper>'不包含'PagedListPager'的定义和最佳扩展方法重载'PagedList.Mvc.HtmlHelper.PagedListPager（System.Web.Mvc.HtmlHelper，PagedList .IPagedList，System.Func）'有一些无效的参数

来源错误：

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

Controller ：

public ActionResult Index(int? page, string sortOrder, string currentFilter, int? managerGroupId, int? userGroupId, bool deletedBooks = false)
    {     
           var models = new LibraryViewModel[] { };
            models = Repository.LibrariesAsViewModels(managerGroup: managerGroupId, userGroup: userGroupId, includeInactive: deletedBooks)
                    .Where(p => p.ParentID.HasValue == false).OrderByDescending(p => p.SortOrder)
                    .Where(p => deletedBooks ? p.IsActive == false : true)
                    .ToArray();

            ViewBag.CurrentSort = sortOrder;
            ViewBag.currentFilter = currentFilter;
            int pageSize = 6;
            int pageNumber = (page ?? 1);

        //    var model = new PageModelList<LibraryViewModel>();  **original code
        //    model.Items = models;  ** original code

            var modelnew = new PageModelList<LibraryViewModel>();
            modelnew.PList = models.ToPagedList(pageNumber, pageSize);

        // return view(model) **original code
            return View(modelnew);

}

PageModelList类

public class PageModelList<T> : PageModel
{
    public IEnumerable<T> Items { get; set; }
    public int Count
    {
        get
        {
            if (Items == null)
            {
                return 0;
            }

            return Items.Count();
        }
    }

    public IPagedList<T> PList { get; set; }
}

查看

@using PagedList.Mvc;
@using PagedList;
@model PageModelList<LibraryViewModel>

@*model PagedList.IPagedList<PageModelList<LibraryViewModel>>  --Commented out, there is error*@ 


<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />

<div class="text-center">
    <ul class="pagination">
        @*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 }))
    </ul>
</div>