Connect to Yelp Data from Blazor Apps

Blazor is a framework for developing modern, client-side web UIs using .NET technology. Instead of coding in JavaScript, developers can use the familiar C# language and .NET libraries to build app UIs.

The CData API Driver for ADO.NET can be used with standard ADO.NET interfaces, such as LINQ and Entity Framework, to interact with live Yelp data. Since Blazor supports .NET Core, developers can use CData ADO.NET Providers in Blazor apps. In this article, we will guide you to build a simple Blazor app that talks to Yelp using standard SQL queries.

Install the CData API Driver for ADO.NET

CData ADO.NET Providers allow users to access Yelp just like they would access SQL Server, using simple SQL queries.

Install the Yelp ADO.NET Data Provider from the CData website or from NuGet. Search NuGet for "Yelp ADO.NET Data Provider."

Create a Yelp-Connected Blazor App

Start by creating a Blazor project that references the CData API Driver for ADO.NET

1. Create a Blazor project on Visual Studio.

2. From the Solution Explorer, right click Dependencies, then click Add Project Reference.
3. In the Reference Manager, click the Browse button, and choose the .dll file of the installed ADO.NET Provider (e.g. System.Data.CData.API.dll, typically located at C:\Program Files\CData\CData API Driver for ADO.NET\lib etstandard2.0).

SELECT Yelp Data from the Blazor App

1. Open the Index.razor file from the Project page.
2. In a APIConnection object, set the connection string:

   Start by setting the Profile connection property to the location of the Yelp Profile on disk (e.g. C:\profiles\Yelp.apip). Next, set the ProfileSettings connection property to the connection string for Yelp (see below).

   Yelp API Profile Settings

   Create an app at yelp.com/developers/v3/manage_app to automatically generate a private API token.

   For example: Profile=C:\profiles\Yelp.apip;ProfileSettings='APIKey=your_api_key';

3. The code below creates a simple Blazor app for displaying Yelp data, using standard SQL to query Yelp just like SQL Server.

         @page "/"
         @using System.Data;
         @using System.Data.CData.API;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (APIConnection connection = new APIConnection(
                   "Profile=C:\profiles\Yelp.apip;ProfileSettings='APIKey=your_api_key';"))
                 {
                     var sql = "SELECT Id, Name FROM AutocompleteBusinesses WHERE Name = 'Coffee'";
                     var results = new DataTable();
         
                     APIDataAdapter dataAdapter = new APIDataAdapter(sql, connection);
                     dataAdapter.Fill(results);
         
                     <table class="table table-bordered">
                         <thead class="thead-light">
                             <tr>
                                 @foreach (DataColumn item in results.Rows[0].Table.Columns)
                                 {
                                     <th scope="col">@item.ColumnName</th>
                                 }
                             </tr>
                         </thead>
                         <tbody>
                             @foreach (DataRow row in results.Rows)
                             {
                                 <tr>
                                     @foreach (var column in row.ItemArray)
                                     {
                                         <td>@column.ToString()</td>
                                     }
                                 </tr>
                             }
                         </tbody>
                     </table>
                 }
             </div>
         </div>
       

4. Rebuild and run the project. The ADO.NET Provider renders Yelp data as an HTML table in the Blazor app.

   At this point, you have a Yelp-connected Blazor app, capable of working with live Yelp data just like you would work with a SQL Server instance. Download a free, 30-day trial and start working with live Yelp data in your Blazor apps today.