Connect to Perigon 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 Perigon 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 Perigon using standard SQL queries.

Install the CData API Driver for ADO.NET

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

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

Create a Perigon-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.
👁 Create a Blazor app project.

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).
👁 Reference ADO.NET for Perigon .dll in the Blazor app.

SELECT Perigon Data from the Blazor App

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

   Using API Key Authentication

   To use the Perigon API, you need to obtain an API key from your Perigon account. Navigate to the Perigon dashboard and generate an API key from your account settings.

   After setting the following connection properties, you are ready to connect:

   • AuthScheme: Set this to APIKey.
   • APIKey: Set this to your Perigon API key.

   Example connection string:

   Profile=C:\profiles\Perigon.apip;AuthScheme=APIKey;ProfileSettings="APIKey=your_api_key"
   

   Available Tables

   The Perigon profile provides access to the following tables:

   • Articles - News articles retrieved from the Perigon news intelligence API
   • Headlines - Story clusters grouping related headline articles
   • Sources - News sources tracked by the Perigon news intelligence API
   • Journalists - Journalist profiles tracked by the Perigon news intelligence API

   For example: Profile=C:\profiles\Perigon.apip;AuthScheme=APIKey;ProfileSettings="APIKey=your_api_key"

3. The code below creates a simple Blazor app for displaying Perigon data, using standard SQL to query Perigon 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\Perigon.apip;AuthScheme=APIKey;ProfileSettings="APIKey=your_api_key""))
    {
    var sql = "SELECT , FROM Articles WHERE = ''";
    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 Perigon data as an HTML table in the Blazor app. 👁 Query Perigon from Blazor app.
   

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