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Part-3 | Blazor WebAssembly | .Net7 API | MudBlazor | CRUD - Implement Read Operation

The main objectives of this article are:
  • Create HTTP GET endpoint in API Project.
  • Consume The GET API In Blazor WebAssembly Application

Create A Service File And Implement Read Logic In API Project:

Let's create a folder like 'Services' in our API project.

Now add the 'ISuperHeroesService.cs' interface in the 'Services' folder.
API_Project/Services/ISuperHeroesService.cs:
using Dot7.Api.Data.Entities;
namespace Dot7.Api.Services
{
    public interface ISuperHeroesService
    {
        Task<List<SuperHeroes>> GetSuperHeroesAsync();
    }
}
  • In the 'ISuperHeroesService' interface defined method definition like 'GetSuperHeroesAsync()'.
Now add the 'SuperHeroesService.cs' class in the 'Services' folder.
API_Project/Services/SuperHeroesService.cs:
using Dot7.Api.Data.Entities;
using Microsoft.EntityFrameworkCore;
namespace Dot7.Api.Services
{
    public class SuperHeroesService: ISuperHeroesService
    {
        private readonly MyWorldDbContext _myWorldDbContext;
        public SuperHeroesService(MyWorldDbContext myWorldDbContext)
        {
            _myWorldDbContext = myWorldDbContext;
        }

        public async Task<List<SuperHeroes>> GetSuperHeroesAsync()
        {
            return await _myWorldDbContext.SuperHeroes.ToListAsync();
        }
    }
}
  • (Line: 7-11) Injected the 'MyWorldDbContext'.
  • (Line: 13-16) In 'GetSuperHeroesAsync' method we fetch the collection of records from the database.
Register our service files in 'Program.cs'
API_Project/Program.cs:
builder.Services.AddScoped<ISuperHeroesService, SuperHeroesService>();

Create A 'SuperHeroesController' And Create A HTTP GET Endpoint: 

Let's create a new controller like 'SuperHeroesController.cs'.
API_Project/Controllers/SuperHeroesController.cs:
using Dot7.Api.Services;
using Microsoft.AspNetCore.Mvc;

namespace Dot7.Api.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class SuperHeroesController : ControllerBase
    {
        private readonly ISuperHeroesService _superHeroesService;
        public SuperHeroesController(ISuperHeroesService superHeroesService)
        {
            _superHeroesService = superHeroesService;
        }

        [HttpGet]
        public async Task<IActionResult> GetAsync()
        {
            var results = await _superHeroesService.GetSuperHeroesAsync();
            return Ok(results);
        }
    }
}
  • (Line: 10-14) Injected the 'ISuperHeroesService'.
  • (Line: 16-21) The 'HttpGet' endpoint fetches the collection of data from the database.

Create 'SuperHeroesVm' In Blazor WebAssemply App:

First, let's create a folder like 'ViewModels' in Blazor App.

Now add the 'SuperHeroesVm.cs' in 'ViewModels' folder. Here 'SuperHeroesVm.cs' is our API response model.
BlazorWasm_Project/ViewModels/SuperHeroesVM.cs:
namespace Dot7.BlazorCrud.UI.ViewModels
{
    public class SuperHeroesVM
    {
        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; }
    }
}
Now add the namespace in '_Import.razor'
BlazorWasm_Project/_Import.razor:
@using Dot7.BlazorCrud.UI.ViewModels

Register API Domain In Blazor WebAssembly App:

Now register the API domain in 'Program.cs'.
BlazorWasm_Project/Program.cs:
builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri("https://localhost:7282") });

Create A 'AllSuperHeroes.razor' Component:

First,  let's create a new folder like 'SuperHeroes' in 'Pages' folder.

Now add a new component like 'AllSuperHeroes.razor' in the 'SuperHeroes' folder.
BlazorWasm_Projects/Pages/SuperHeroes/AllSuperHeroes.razor:(HTML Part)
@page "/superheroes/home"
@inject HttpClient Http

<MudContainer Class="ma-4 d-flex">
    @foreach (var item in allHeroes)
    {
        <MudCard Width="250px;" Class="mr-2">
            <MudCardHeader>
                <CardHeaderAvatar>
                    <MudAvatar Color="Color.Secondary">@item.Id</MudAvatar>
                </CardHeaderAvatar>
                <CardHeaderContent>
                    <MudText Typo="Typo.body1">@item.Name</MudText>
                </CardHeaderContent>
               
            </MudCardHeader>
            <MudCardMedia Image="@(item.ImageURL)" Height="250" />
            <MudCardContent>
                <MudText Typo="Typo.body2">Franchise - @item.Franchise</MudText>
                <MudText Typo="Typo.body2">Gender - @item.Gender</MudText>
            </MudCardContent>
           
        </MudCard>
    }
</MudContainer>
  • (Line: 2) The '@page' directive to configure route for blazor component.
  • (Line: 3) Injected the 'HttpClient' instance.
  • (Line: 5-26) Looping our API response to the MudBlazor card component.
BlazorWasm_Projects/Pages/SuperHeroes/AllSuperHeroes.razor:(C# Part) 
@code {
    private List<SuperHeroesVM> allHeroes = new List<SuperHeroesVM>();

    protected override async Task OnInitializedAsync()
    {
        await GetAllSuperHeroesAsync();
    }

    private async Task GetAllSuperHeroesAsync()
    {
        allHeroes = await Http.GetFromJsonAsync<List<SuperHeroesVM>>("/api/superheroes");
    }
}
  • (Line: 2) Here initialized the instance of 'SuperHeroesVm' collection.
  • (Line: 4-7) The 'OnInitializedAsync' method is the blazor life cycle method.
  • (Line: 9-12) The 'GetAllSuperHeroesAsync' method contains logic to invoke the HTTP GET endpoint.

Enable CORS In API Project:

Let's enable CORS in API project that allows our Blazor App to consume the API endpoint.
Program.cs:

Let's run both API and Blazor WebAssembly applications.
In the next article, we will implement the Create Operation.

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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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Comments

  1. AnonymousJuly 11, 2023 at 2:58 PM

    aspnetcore-browser-refresh.js:234 WebSocket connection to 'wss://localhost:44328/BlazorApp2/' failed: Error in connection establishment: net::ERR_CERT_AUTHORITY_INVALID
    (anonymous) @ aspnetcore-browser-refresh.js:234
    getWebSocket @ aspnetcore-browser-refresh.js:231
    (anonymous) @ aspnetcore-browser-refresh.js:15
    :7015/api/MoTSTeam:1 Failed to load resource: net::ERR_CONNECTION_REFUSED
    blazor.webassembly.js:1 crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
    Unhandled exception rendering component: TypeError: Failed to fetch
    System.Net.Http.HttpRequestException: TypeError: Failed to fetch
    ---> System.Runtime.InteropServices.JavaScript.JSException: TypeError: Failed to fetch
    at System.Net.Http.BrowserHttpHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    --- End of inner exception stack trace ---

    ReplyDelete
  2. AnonymousJuly 11, 2023 at 3:00 PM

    I am trying to call api end point in razor page, looks like some call is not going to API end point. Can you plz suggest me on this issue?.

    ReplyDelete

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