MVC 4 Paging error - asp.net-mvc

Question

using this controller I am getting the error
the model item passed into the dictionary is of type 'System.Collections.Generic, but this dictionary requires a model item of type 'PagedList.IPagedList`
public ViewResult Index(string searchstring, string currentFilter, int? page)
{
if (searchstring == null && currentFilter == null && !page.HasValue)
{
// No parameters
var adulliteracyteachers = db.AdulLiteracyTeachers.Include(a => a.District);
return View(adulliteracyteachers.ToList());
}
// Regular code here down
if (searchstring != null)
{
page = 1;
}
else
{
searchstring = currentFilter;
}
ViewBag.CurrentFilter = searchstring;
var teachers = from r in db.AdulLiteracyTeachers select r;
if (!string.IsNullOrEmpty(searchstring))
{
teachers = teachers.Where(r => r.ALTName.ToUpper().Contains(searchstring.ToUpper()));
}
teachers = teachers.OrderBy(r => r.ALTName);
int pagesize = 10;
int pageNo = (page ?? 1);
return View(teachers.ToPagedList(pageNo, pagesize));
}
my view index.cshtml is :
#using PagedList;
#using PagedList.Mvc;
#model IPagedList<LiteracyPayroll.Models.AdulLiteracyTeachers>
#{
ViewBag.Title = "Index";
}
<h2>Index</h2>
<p>
#Html.ActionLink("Create New", "Create")
</p>
#using (Html.BeginForm("Index","AdultLiteracyTeachers",FormMethod.Get))
{
<p>
Find By Teacher Name: #Html.TextBox("searchstring",ViewBag.CurrentFilter as string)
<input type="submit" value="Search" />
</p>
}
<table>
<tr>
<th>
#Html.DisplayNameFor(model => model.First().District.DistName)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTCLC)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTGEN)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTCNIC)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTDOB)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTName)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTFName)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTAppNo)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTDes)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTQuali)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTexp)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTDom)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTdoc)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTBG)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTAddress)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTcontact)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTBankno)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTBankname)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTBcode)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTNTN)
</th>
<th>
#Html.DisplayNameFor(model => model.First().ALTPay)
</th>
<th>
#Html.DisplayNameFor(model => model.First().Image)
</th>
<th></th>
</tr>
#foreach (var item in Model) {
<tr>
<td>
#Html.DisplayFor(modelItem => item.District.DistName)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTCLC)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTGEN)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTCNIC)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTDOB)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTName)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTFName)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTAppNo)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTDes)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTQuali)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTexp)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTDom)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTdoc)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTBG)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTAddress)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTcontact)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTBankno)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTBankname)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTBcode)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTNTN)
</td>
<td>
#Html.DisplayFor(modelItem => item.ALTPay)
</td>
<td>
<img src="#Url.Content("~/Content/Uploads/" + "/" + item.Image + "")" alt="#item.Image" width="100px" height="100px" />
</td>
<td>
#Html.ActionLink("Edit", "Edit", new { id=item.ALTid }) |
#Html.ActionLink("Details", "Details", new { id=item.ALTid }) |
#Html.ActionLink("Delete", "Delete", new { id=item.ALTid })
</td>
</tr>
}
</table>
<div>
Page #(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) Of #Model.PageCount
#Html.PagedListPager(Model, page => Url.Action("Index", new { page }))
</div>

Answer 1

The problem is here in below line when you check that "searchstring" and "currentFilter" is null. Currently it look like this -
public ViewResult Index(string searchstring, string currentFilter, int? page)
{
if (searchstring == null && currentFilter == null && !page.HasValue)
{
// No parameters
var adulliteracyteachers = db.AdulLiteracyTeachers.Include(a => a.District);
return View(adulliteracyteachers.ToList());
}
// Regular code here down
blah... blah..
}
Change your code to say this instead should fix it:
// Initialize the pagesize and pageNo at the starting of the function
int pagesize = 10;
int pageNo = (page ?? 1);
if (searchstring == null && currentFilter == null && !page.HasValue)
{
// No parameters
var adulliteracyteachers = db.AdulLiteracyTeachers.Include(a => a.District);
return View(adulliteracyteachers.ToPagedList(pageNo, pagesize));
}
// Regular code here down
.......