QuickPaginator 1.0.12

Quick Paginator (.NET)

Author: Ryan Kueter
Updated: October, 2022

About

Quick Paginator is a free .NET library, available from the NuGet Package Manager, that provides a quick way to paginate a list of items.

Targets:

• .NET 6

Properties

The QuickPaginator provides a number of properties that contain calculated values for each page.

Instantiation

// CurrentPage, ResultsCount, PageLimit (optional - default: 10), ButtonCount (optional - default: 7)
var Pager = new Paginator(50, 1000, 10, 11);

// CurrentPage, ResultsCount, PageLimit (optional - default: 10)
var Pager = new Paginator(10, 100, 10);

// If you want 10 per page and seven buttons:
var Pager = new Paginator(10, 100);

// Or to satisfy a nullability check:
var Pager = new Paginator();

Skip & Take

These values work with Linq skip and take:

Pager.Skip
// Output: 90

Pager.Take
// Output: 10

Example:
result.Skip(Pager.Skip).Take(Pager.Take).ToList();

First & Last

The first and last pages:

Pager.First
// Output: 1

Pager.Last
// Output: 10

Previous & Next

Since we are on page 10 and don't have a next page, Next returns a value of -1.

Pager.Previous
// Output: 9

Pager.Next
// Output: -1

// Additionally:
Pager.PreviousTen
Pager.PreviousTwenty
Pager.PreviousFifty
Pager.PreviousHundred

Pager.NextTen
Pager.NextTwenty
Pager.NextFifty
Pager.NextHundred

Current Count & Total Count

The current count contains the number of total items viewed. And the total count contains the total number of items.

In the following example, since we are on page ten with ten items per page, we have viewed the total number of items.

Pager.CurrentCount
// Output: 100

Pager.TotalCount
// Output: 100

BetweenPages

BetweenPages is a dictionary array that stores a list of buttons between the previous and next buttons. The between pages array by default only returns 7 buttons. For example, if you are on page 1 of 100 pages, you will see pages 1 - 7. If you are on page 8 of 100 pages, you will see pages 5 - 11 to keep the current page centered.

BetweenPages has a default of 7 buttons. But you can change this default by specifying the fourth parameter in the constructor.

The following example produces 100 pages of results and the current page is 20.

foreach (var b in Pager.BetweenPages)
{
    Console.WriteLine($"Key: {b.Key}, Value:{b.Value}");
}

// Output (default 7 buttons)
Key: 17, Value:
Key: 18, Value:
Key: 19, Value:
Key: 20, Value:active
Key: 21, Value:
Key: 22, Value:
Key: 23, Value:

// If you want to specify the number of buttons, include the fourth parameter:
new Paginator(20, 1000, 10, 11);

// Output 
Key: 15, Value:
Key: 16, Value:
Key: 17, Value:
Key: 18, Value:
Key: 19, Value:
Key: 20, Value:active
Key: 21, Value:
Key: 22, Value:
Key: 23, Value:
Key: 24, Value:
Key: 25, Value:

AllPages

AllPages is a dictionary array that stores a list of all the pages.

In this example, page 10 is the active page.

foreach (var b in Pager.AllPages)
{
    Console.WriteLine($"Key: {b.Key}, Value:{b.Value}");
}

// Output
Key: 1, Value:
Key: 2, Value:
Key: 3, Value:
Key: 4, Value:
Key: 5, Value:
Key: 6, Value:
Key: 7, Value:
Key: 8, Value:
Key: 9, Value:
Key: 10, Value:active

A Razor Pages Example

The following is an example of how you would initialize the Paginator:

using QuickPaginator;

public class UsersModel : PageModel
{
    private readonly IUsersDataService _usersDataService;
	
    public Paginator Pager { get; set; }

    [BindProperty]
    public List<User> ActiveUsers { get; set; }

    [BindProperty(SupportsGet = true)]
    public int? Number { get; set; } = 1;

    public int PageCount { get; set; } = 10;

    public UsersModel(IUsersDataService usersDataService)
    {
        _usersDataService = usersDataService;
        ActiveUsers = new();
    }

	public async Task OnGetAsync()
    {
        if (ModelState.IsValid)
        {
            var response = await _usersDataService.GetAllUsers();
            if (response.Response is not null && response.Response.IsSuccess())
            {
                var result = response.Users.ToList();

                // Paginator(<CurrentPageNumber>, <ResultCount>, <PageCount>)
                Pager = new Paginator(Number, result.Count(), PageCount);

                // Active Users
                ActiveUsers = result.Skip(Pager.Skip).Take(Pager.Take).ToList();
            }
        }
    }
}

The following is an example of how you would use the Paginator in a Razor pages application.

<nav class="app-pagination">
	@{
		var pager = Model.Pager;
	}
	<ul class="pagination justify-content-center">
		@if (pager.PageCount <= 1)
		{
			<li class="page-item active">No more results.</li>
		}
		else
		{
			@if (pager.Previous is not -1)
			{
				<li class="page-item">
					<a class="page-link" href="/Admin/Users/@pager.First">First</a>
				</li>
				<li class="page-item">
					<a class="page-link" href="/Admin/Users/@pager.Previous">Previous</a>
				</li>
			}
			else
			{
				<li class="page-item disabled">
					<a class="page-link" tabindex="-1" aria-disabled="true">First</a>
				</li>
				<li class="page-item disabled">
					<a class="page-link" tabindex="-1" aria-disabled="true">Previous</a>
				</li>
			}
			@foreach (var b in pager.BetweenPages)
			{
				<li class="page-item @b.Value"><a class="page-link" href="/Admin/Users/@b.Key">@b.Key</a></li>
			}
			@if (pager.Next is not -1)
			{
				<li class="page-item">
					<a class="page-link" href="/Admin/Users/@pager.Next">Next</a>
				</li>
				<li class="page-item">
					<a class="page-link" href="/Admin/Users/@pager.Last">Last</a>
				</li>
			}
			else
			{
				<li class="page-item disabled">
					<a class="page-link" tabindex="-1" aria-disabled="true">Next</a>
				</li>
				<li class="page-item disabled">
					<a class="page-link" tabindex="-1" aria-disabled="true">Last</a>
				</li>
			}
		}
	</ul>
	<div class="d-flex justify-content-center">
		@if (pager.PageCount >= 1)
		{
			<span>(@pager.CurrentCount of @pager.TotalCount results)</span>
		}
	</div>
</nav>

Contributions

Quick Paginator is being developed for free by me, Ryan Kueter, in my spare time. So, if you use this library and see a need for improvement, please send your ideas.