Showing Blog Articles in Blazor with GraphQL

In today’s world of decoupled architectures, headless CMS systems provide a flexible and scalable approach to content management.

This article demonstrates how to leverage Blazor, a .NET framework for building interactive web UIs with C#, to seamlessly integrate content from a headless CMS like Hashnode’s GraphQL API into your Blazor application.

I have my site in Blazor Server and I decided to show most recent articles from my blog on my site. I did it successfully and it was really a fun. I wanted to share fun with you.

Let’s begin…

Let’s assume you already have Blazor site and Hashnode blog available with you.

Prerequisites:

• Basic understanding of Blazor development

• A Hashnode blog with a few articles

• A Blazor project set up (use Visual Studio or the .NET CLI)

Activate Hashnode Headless feature

Lets Jump to our Blazor app.

Install Nuget Packages :

Begin by installing the System.Text.Json, Newtonsoft.Json library in your Blazor project. You can also use Apollo GraphQL Client NuGet package. In this example I have not used it and I achieved with httpclient

Bash

dotnet add package System.Text.Json
dotnet add package Newtonsoft.Json

Interface idea: We are going to display 9 most recent articles in 3 rows with 3 articles in each row.

Lets create a Article Model in Article.cs

 public class Article
 {
     public string Id { get; set; }
     public string Slug { get; set; }
     public string Title { get; set; }
     public string Url { get; set; }
     public string OgImage { get; set; }
 }

Create Service to Bring Articles from Hashnode Blog from GraphQL API

Create one Service Class into ArticleService.cs

    public class ArticleService {
      private readonly HttpClient _httpClient;

      public ArticleService(HttpClient httpClient) {
        _httpClient = httpClient;
      }

      public async Task < List < Article >> GetArticlesAsync() {
        string blogAccountName = "yourblogaccountname";
        string AuthenticationToken = "c85e054t-43c4-488b-9254-74c00b07c01e";
        var query = new {
          query = @ "
          query GetUserFeed {
            user(username: ""
              " + blogAccountName + @"
              "") {
              posts(pageSize: 9, page: 1) {
                edges {
                  node {
                    id,
                    slug,
                    title,
                    url,
                    ogMetaData {
                      image
                    },

                  }
                }
              }
            }
          }
          "
        };

        var content = new StringContent(JsonSerializer.Serialize(query), Encoding.UTF8, "application/json");
        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", AuthenticationToken);
        var response = await _httpClient.PostAsync("https://gql.hashnode.com/", content);

        response.EnsureSuccessStatusCode();
        var responseContent = await response.Content.ReadAsStringAsync();

        var articles = new List < Article > ();

        var json = JObject.Parse(responseContent);
        var edges = json["data"]["user"]["posts"]["edges"];

        foreach(var edge in edges) {
          var node = edge["node"];
          var article = new Article {
            Id = node["id"].ToString(),
              Slug = node["slug"].ToString(),
              Title = node["title"].ToString(),
              Url = node["url"].ToString(),
          };
          if (node["ogMetaData"] != null) {
            var og = node["ogMetaData"];

            article.OgImage = og["image"]?.ToString();
          }
          articles.Add(article);
        }
        return articles;

      }
    }

Above code prepares GraphQL query and sends request to Hashnode API service to return article’s Id, Slug, Title, URL and article’s OgImage. It returns the list of Articles.

Get Authentication Token

If you do not have the Authentication token. It is easy to get one in Hashnode. You can jump to Developer section in Settings and click on Generate New Token

Add Service to Dependency Injection

Now, Add service to the dependency injection container (in Program.cs). Specifically, it is registering an HTTP client for the ArticleService class.

builder.Services.AddHttpClient();

Create Component to Display Blog Articles

Create Component Articles.razor to articles loaded by service

@inject ArticleService ArticleService

Loading...

@if (articles != null)
{
  
class="row">
    @foreach (var article in articles)
    {
      
class="col-md-4 mb-4">
        
class="card">
          @if (!string.IsNullOrEmpty(article.OgImage))
          {
            "@article.OgImage" class="card-img-top" alt="@article.Title" />
          }
          else
          {
            "images/Default.png" class="card-img-top" alt="@article.Title" />
          }
          
        
      
    }
  
}

@code {
  private List
 articles;

  protected override async Task OnInitializedAsync()
  {
    articles = await ArticleService.GetArticlesAsync();
  }
}

Above component brings articles using ArticleService and display them in 3X3 using bootstrap css.

Make sure you have included latest bootstrap included in App.razor or Parent Layout of the page

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet" />

Finally place the Article.razor component wherever you want to display the articles from blog.

<div class="mt-12 text-center gap-5">
  <h2 class="text-3xl font-bold">Blog postsh2>
  <div id="articles" class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
    <Articles>Articles>
  div>
div>

For more details you can refer these