Keep Filter from HttpPost on next page of PaginatedList in ASP.NET Core MVC - asp.net

Question

I am creating a program in which I have a Database with records I want to filter.
The filter has 4 input type="text" and returns the right records based on the filters I typed.
The problem is, when I click Next Page link (of PaginatedList), the second page has no filters adapted.
It lose the filters I gave. I know I must give asp-route on Next Page link some variable with the data given in filter like Microsoft Tutorial gives currentFilter, but I have 4 filters like this :
Name=x&Phone=y&...
Here is my Controller Code simplyfied :
public async Task<IActionResult> Index( some variables ){
var appusers = from a in _context.AppUsers
select a;
return(return View(await app.PaginatedList<AppUser>.CreateAsync(appusers.AsNoTracking(), pageNumber ?? 1, pageSize));)
}
AND
[HttpPost]
public async Task<IActionResult> Index(string Name, string Phone, string Calls, string Date){
var ap = from c in _context.AppUsers
select c;
Filter The database based on variable values Name,Phone,Calls,Date
return View(await PushNotificationApp.PaginatedList<AppUser>.CreateAsync(ap.AsNoTracking(),
pageNumber?? 1, pageSize));}
Here is the part of Index :
#using (Html.BeginForm("Index", "AppUsers", new { id = "filterForm" }))
{
name="SearchTrips" value="#ViewData["CurrentTrips"]" />
<input id="NameFilterField" type="text" name="Name" />
<input id="PhoneFilterField" type="text" name="Phone" />
<input id="CallsFilterField" type="text" name="Calls" />
<input id="DateFilterField" type="text" pattern="\d{1,2}/\d{1,2}/\d{4}" name="Date" />
<button class="m-3" type="submit" value="submit">Search</button>
}
AND PAGELIST LINK PART :
<div class="p-2 bd-highlight">
<nav aria-label="Page navigation example">
<ul class="pagination">
<li class="page-item">
<a class="page-link MainButton" asp-action="Index"
asp-route-pageNumber="#(Model.PageIndex - 1)"
asp-route-currentFilter="#ViewData["CurrentFilter"]"
class="page-link #prevDisabled">
Previous
</a>
</li>
<li class="page-item">
<a class="page-link MainButton" asp-action="Index"
asp-route-pageNumber="#(Model.PageIndex + 1)"
asp-route-currentFilter="#ViewData["CurrentFilter"]"
Next
</a>
</li>
</ul>
</nav>
</div>

Answer 1

The problem is, when I click Next Page link (of PaginatedList), the second page has no filters adapted. It lose the filters I gave.
You are doing the filter in the Post action, but when you click the Next link, it will go to the Get action which not filter. So, I think you can make the form do a get request and just do the filter in the Get method.
I know I must give asp-route on Next Page link some variable with the data given in filter like Microsoft Tutorial gives currentFilter, but I have 4 filters like this : Name=x&Phone=y&...
4 filters is the same, just give the other filter parameters to the Next link
<a class="page-link MainButton" asp-action="Index"
asp-route-pageNumber="#(Model.PageIndex + 1)"
asp-route-Name="#ViewData["Name"]"
asp-route-Phone="#ViewData["Phone"]"
asp-route-Calls="#ViewData["Calls"]"
asp-route-Date="#ViewData["Date"]"
Next
</a>

Answer 2

why not use a single box to search everything or four search boxes using the method below in the tutorial?
if (!String.IsNullOrEmpty(searchString))
{
students = students.Where(s => s.LastName.Contains(searchString)
|| s.FirstMidName.Contains(searchString));
}