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Part-9 | Blazor WebAssembly | .Net7 API | MudBlazor | CRUD - Implement Pagination

The main objective of the article is:
  • Implements Pagination.

Implement Pagination In API Project:

Let's change our HTTP GET Endpoint where we have to fetch the total number of records in the API response.

Let's create a new API response like 'SuperHeroesContainerDto'.
API_Project/Dtos/SuperHeroesContainerDto.cs:
namespace Dot7.Api.Dtos
{
    public class SuperHeroesContainerDto
    {
        public int TotalCount { get; set; }
        public List<SuperHeroesDto> SuperHeroes { get; set; }
    }

    public class SuperHeroesDto
    {
        public int Id { get; set; }
        public string? Name { get; set; }
        public string? Franchise { get; set; }
        public string? Gender { get; set; }
        public string? ImageURL { get; set; }
    }
}
  • Here we have properties like 'TotalCount'  and a collection of  'SuperHeroesDto'.
Install the Automapper NuGet package.

Now create an auto mapper profiler class like 'AppMapperProfile.cs' in the 'Common' folder(new folder).
API_Project/Common/AppMapperProfile.cs:
using AutoMapper;
using Dot7.Api.Data.Entities;
using Dot7.Api.Dtos;

namespace Dot7.Api.Common
{
    public class AppMapperProfile: Profile
    {
        public AppMapperProfile()
        {
            CreateMap<SuperHeroes, SuperHeroesDto>();
        }
    }
}
  • Created mapper configuration between 'SuperHeroes' & 'SuperHeroesDto'.
Register the auto mapper service in 'Program.cs'
API_Project/Program.cs:
builder.Services.AddAutoMapper(typeof(Program));
Let's update the return type of 'GetSuperHeroesAsync' method definition in 'ISuperHeroesService'.
API_Project/Services/ISuperHeroesService.cs:
Task<SuperHeroesContainerDto> GetSuperHeroesAsync(SuperHeroFiltersDto filters);
Let's update the logic in the 'GetSuperHeroesAsync' method.
API_Project/Services/SuperHeroesService.cs:
public async Task<SuperHeroesContainerDto> GetSuperHeroesAsync(SuperHeroFiltersDto filters)
{
	var superHereos = _myWorldDbContext.SuperHeroes.AsQueryable();

	if(!string.IsNullOrEmpty(filters.Sort) && !string.IsNullOrEmpty(filters.OrderBy))
	{
		if(filters.Sort.ToLower() == "id" && filters.OrderBy.ToLower() == "asc")
		{
			superHereos = superHereos.OrderBy(_ => _.Id);
		}
		else if (filters.Sort.ToLower() == "id" && filters.OrderBy.ToLower() == "desc")
		{
			superHereos = superHereos.OrderByDescending(_ => _.Id);
		}
		else if (filters.Sort.ToLower() == "franchise" && filters.OrderBy.ToLower() == "asc")
		{
			superHereos = superHereos.OrderBy(_ => _.Franchise);
		}
		else if (filters.Sort.ToLower() == "franchise" && filters.OrderBy.ToLower() == "desc")
		{
			superHereos = superHereos.OrderByDescending(_ => _.Franchise);
		}
	}

	if (!string.IsNullOrEmpty(filters.Search))
	{
		superHereos = superHereos.Where(_ => _.Franchise.ToLower() == filters.Search.ToLower());
	}

	int totalCount = await superHereos.CountAsync();

	int skip = ((filters.PageNumber - 1) * filters.PageSize);
	int take = filters.PageSize;

	superHereos = superHereos.Skip(skip).Take(take);
	var dbSuperHeroes = await superHereos.ToListAsync();
	var resultSuperHereos = _mapper.Map<List<SuperHeroesDto>>(dbSuperHeroes);

	return new SuperHeroesContainerDto { TotalCount = totalCount, SuperHeroes = resultSuperHereos };
}
  • (Line: 30) Fetch the total number of records from the database.
  • (Line: 32-35) Here 'Skip' means the total number of records that needs to be skipped. Here 'take' means total records to fetch
  • (Lines: 36&37) Here mapping the 'SuperHeroes' to 'SuperHeroesDto'.

Implement Pagination In Blazor WebAssembly Application:

Let's implement the MudBlazor pagination in 'AllSuperHeroes.razor'.
BlazorWasm_Project/Pages/SuperHeroes/AllSuperHeroes.razor:(HTML Part)
<div class="d-flex ma-2">
	<MudGrid>
		<MudItem md="4">
			<MudSelect Margin="Margin.Dense" Class="mt-2" T="string" Label="Sorting" Variant="Variant.Text" ValueChanged="DoSorting">
				<MudSelectItem Value="@("id-by-desc")">ID BY Desc</MudSelectItem>
				<MudSelectItem Value="@("id-by-asc")">ID By Asc</MudSelectItem>
				<MudSelectItem Value="@("franchise-by-desc")">Franchise BY Desc</MudSelectItem>
				<MudSelectItem Value="@("franchise-by-asc")">Franchise By Asc</MudSelectItem>
			</MudSelect>
		</MudItem>
		<MudItem md="4">
			<MudTextField @bind-Value="SearchKey" Label="Search" Variant="Variant.Text" Adornment="Adornment.End" AdornmentIcon="@Icons.Material.Filled.Search" OnAdornmentClick="DoSearch" AdornmentColor="Color.Primary" />
		</MudItem>
		<MudItem md="4">
			<MudPagination Color="Color.Primary" Count="@GetTotalPages()" SelectedChanged="HandlePaging"  />
		</MudItem>
	</MudGrid>
</div>
  • (Line: 14-16) Configured the 'MudPagination' component. The 'Count' property is registered with 'GetTotalPages'. The 'Count' property is used to display the page numbers. The 'SelectedChanged' event raises on clicking page controls.
BlazorWasm_Project/Pages/SuperHeroes/AllSuperHeroes.razor:(c# Part) 
@code {
    private List<SuperHeroesVM> allHeroes = new List<SuperHeroesVM>();
    private string SortingKey { get; set; }
    private string SearchKey{ get; set; }
    private int TotalCount{ get; set; }
    private int PageNumber { get; set; } 
    private int PageSize{ get; set; }

    protected override async Task OnInitializedAsync()
    {
        PageNumber = 1;
        PageSize = 5;
        await GetAllSuperHeroesAsync();
    }

    private async Task GetAllSuperHeroesAsync()
    {
        var url = "/api/superheroes";

        var sortingParams = GetSoringValues();

        url = $"{url}?sort={sortingParams.Sort ?? string.Empty}&orderby={sortingParams.OrderBy ?? string.Empty}&search={SearchKey ?? string.Empty}&PageSize={PageSize}&PageNumber={PageNumber}";

        var result = await Http.GetFromJsonAsync<SuperHeroesContainerVM>(url);
        allHeroes = result.SuperHeroes;
        TotalCount = result.TotalCount;
    }

    private (string Sort, string OrderBy) GetSoringValues()
    {
        if (!string.IsNullOrEmpty(SortingKey))
        {
            if (SortingKey.ToLower() == "id-by-desc")
            {
                return ("id", "desc");
            }
            else if (SortingKey.ToLower() == "id-by-asc")
            {
                return ("id", "asc");
            }
            else if (SortingKey.ToLower() == "franchise-by-desc")
            {
                return ("franchise", "asc");
            }
            else if (SortingKey.ToLower() == "franchise-by-desc")
            {
                return ("franchise", "asc");
            }
        }
        return (string.Empty, string.Empty);
    }

    private async Task DoSorting(string sortKey)
    {
        PageNumber = 1;
        SortingKey = sortKey;
        await GetAllSuperHeroesAsync();
    }

    private async Task DoSearch()
    {
        PageNumber = 1;
        await GetAllSuperHeroesAsync();
    }

    protected int GetTotalPages()
    {
        var totalpages = ((double)TotalCount / (double)PageSize);
        return Convert.ToInt32(Math.Ceiling(totalpages));
    }


    private async Task DeleteSuperHeroesAsync(int id)
    {
        var parameters = new DialogParameters();
        parameters.Add("Id", id);
        var dialog = await _dialogService.ShowAsync<SuperHeroesDeletePopup>("Delete Confirmation", parameters, new DialogOptions { });

        var result = await dialog.Result;
        if (!result.Canceled)
        {
            allHeroes = allHeroes.Where(_ => _.Id != id).ToList();
            TotalCount = TotalCount - 1;
            StateHasChanged();
        }
    }

    private async Task HandlePaging(int page)
    {
        PageNumber = page;
        await GetAllSuperHeroesAsync();
    }
}
  • (Line: 5) The 'TotalCount' property to save the total number of records from the API.
  • (Line: 6) The 'PageNumber' property represents the current page.
  • (Line: 7) The 'PageSize' property represents number of items to display on the page
  • (Line: 55&62) Here we reset the 'PageNumber' to '1' while sorting and searching.
  • (Line: 66-70) The 'GetTotalPages' results a total number of page numbers to display
  • (Line: 88-90) The 'hadlePaging()' method gets invoked for every page control-click.

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Wrapping Up:

Hopefully, I think this article delivered some useful information on the.NET7 Blazor WebAssembly CRUD sample. using I love to have your feedback, suggestions, and better techniques in the comment section below.

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