Asp Core, How to create Paging? - asp.net

Question

I want to use PagingList<T>.CreateAsync() to create PagedList in index view but get below error in line var modelPaging = await PagingList<UserListViewModel>.CreateAsync(model, 10, page);:
can not convert from system.collection.Generic.List<> to system.linq.IorderedQueryable<>
my action code :
[HttpGet]
public async Task<IActionResult> Index(int page = 1)
{
List<UserListViewModel> model = new List<UserListViewModel>();
model = _userManager.Users.AsNoTracking().Select(u => new UserListViewModel
{
Id = u.Id,
FullName = u.FirstName + " " + u.LastName,
Email = u.Email
}).OrderBy(u => u.Id).ToList();
var modelPaging = await PagingList<UserListViewModel>.CreateAsync(model, 10, page);
return View(modelPaging);
}
and UserListViewModel Viewmodel:
public class UserListViewModel
{
public string Id { get; set; }
public string FullName { get; set; }
public string Email { get; set; }
public string RoleName { get; set; }
}
What changes should I make in my code?
I asked another question on this subject here link

Answer 1

The error is pretty clear that tells you CreateAsync needs IOrderedQueryable but you are giving the data already retrieved from database. You should pass the query itself. Remove ToList;
var query = _userManager.Users.AsNoTracking().Select(u => new UserListViewModel
{
Id = u.Id,
FullName = u.FirstName + " " + u.LastName,
Email = u.Email
}).OrderBy(u => u.Id);
var modelPaging = await PagingList<UserListViewModel>.CreateAsync(query, 10, page);
The main purpose of PagingList apply the pagination directly from database instead of in-memory.