PagedListPager不包含定义

Question

@using PagedList;
@using PagedList.Mvc;

@model IPagedList<eSchoolSemi.Web.Areas.NastavnikModul.ViewModels.OdrzaniCasIndexVM>

@{
    ViewData["Title"] = "Index";
    Layout = "~/Areas/NastavnikModul/Views/Shared/_Layout.cshtml";
}
<h1>Casovi</h1>
<table class="table table-bordered">
    <thead>
        <tr>
            <th>Subject</th>
            <th>Class Name</th>
            <th>Date</th>
            <th>Action</th>
        </tr>
    </thead>

    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>@item.Subject</td>
                <td>@item.ClassName</td>
                <td>@item.Date</td>
                <td>
                    <a class="btn btn-primary" href="/TeacherModule/HeldClasses/Edit?HeldClassID=@item.HeldClassID&ClassID=@item.ClassID&ClassName=@item.ClassName&Subject=@item.Subject">Edit</a>
                    <a class="btn btn-primary" href="/TeacherModule/HeldClasses/Delete?HeldClassID=@item.HeldClassID&ClassID=@item.ClassID">Delete</a>
                </td>
            </tr>
        }
    </tbody>
</table>

这里的问题是，当我添加

@Html.PagedListPager

出现错误。即使模型类型为IPagedList。我一直在这里寻找答案，其中大多数正在将IEnumerable更改为IPagedList，但就我而言，它一直都是IPagedList。

在我的控制器中，

return View(VM.ToPagedList(page?? 1, 5));

所以肯定是返回分页列表...我不知道我在这里做错了什么。

编辑：有关更多信息，请从控制器中添加索引功能

public IActionResult Index(int? page)
        {
            UserData _User = HttpContext.GetLoggedUser();
            var Teacher = _db.Teacher.First(x => x.UserID == _User.LoggedUserID);

            var query = from O in _db.HeldClass
                        join OD in _db.Class on O.ClassID equals OD.ClassID
                        join NP in _db.Sylabus on OD.SylabusID equals NP.SylabusID
                        join NPP in _db.SylabusSubjects on NP.SylabusSubjectID equals NPP.SylabusSubjectID
                        join P in _db.Subject on NPP.SubjectID equals P.SubjectID
                        join A in _db.Employment on NPP.SylabusSubjectID equals A.SylabusSubjectID
                        where A.TeacherID == Nastavnik.UserID
                        orderby O.Date descending
                        select new { P.Name, OD.Symbol, O.ClassID, O.HeldClassID, O.Date };

            List<HeldClassIndexVM> VM = query.Select(x => new HeldClassIndexVM
            {
                ClassID = x.ClassID,
                Date = x.Date,
                HeldClassID = x.HeldClassID,
                Subject = x.Name,
                Symbol = x.Symbol
            }).ToList();

            return View(VM.ToPagedList(page?? 1, 5));
        }