Connect to Greenhouse 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 ADO.NET Provider for Greenhouse can be used with standard ADO.NET interfaces, such as LINQ and Entity Framework, to interact with live Greenhouse 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 Greenhouse using standard SQL queries.

Install the CData ADO.NET Provider for Greenhouse

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

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

Create a Greenhouse-Connected Blazor App

Start by creating a Blazor project that references the CData ADO.NET Provider for Greenhouse

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.Greenhouse.dll, typically located at C:\Program Files\CData\CData ADO.NET Provider for Greenhouse\lib etstandard2.0).

SELECT Greenhouse Data from the Blazor App

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

   You need an API key to connect to Greenhouse. To create an API key, follow the steps below:

   1. Click the Configure icon in the navigation bar and locate Dev Center on the left.
   2. Select API Credential Management.
   3. Click Create New API Key.
   • Set "API Type" to Harvest.
   • Set "Partner" to custom.
   • Optionally, provide a description.
   4. Proceed to Manage permissions and select the appropriate permissions based on the resources you want to access through the driver.
   5. Copy the created key and set APIKey to that value.

   For example: APIKey=YourAPIKey;

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

         @page "/"
         @using System.Data;
         @using System.Data.CData.Greenhouse;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (GreenhouseConnection connection = new GreenhouseConnection(
                   "APIKey=YourAPIKey;"))
                 {
                     var sql = "SELECT Id, CandidateId FROM Applications WHERE Status = 'Active'";
                     var results = new DataTable();
         
                     GreenhouseDataAdapter dataAdapter = new GreenhouseDataAdapter(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 Greenhouse data as an HTML table in the Blazor app.

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