Connect to Google Cloud Storage 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 Google Cloud Storage can be used with standard ADO.NET interfaces, such as LINQ and Entity Framework, to interact with live Google Cloud Storage 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 Google Cloud Storage using standard SQL queries.

Install the CData ADO.NET Provider for Google Cloud Storage

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

Install the Google Cloud Storage ADO.NET Data Provider from the CData website or from NuGet. Search NuGet for "Google Cloud Storage ADO.NET Data Provider."

Create a Google Cloud Storage-Connected Blazor App

Start by creating a Blazor project that references the CData ADO.NET Provider for Google Cloud Storage

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

SELECT Google Cloud Storage Data from the Blazor App

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

   Authenticate with a User Account

   You can connect without setting any connection properties for your user credentials. After setting InitiateOAuth to GETANDREFRESH, you are ready to connect.

   When you connect, the Google Cloud Storage OAuth endpoint opens in your default browser. Log in and grant permissions, then the OAuth process completes

   Authenticate with a Service Account

   Service accounts have silent authentication, without user authentication in the browser. You can also use a service account to delegate enterprise-wide access scopes.

   You need to create an OAuth application in this flow. See the Help documentation for more information. After setting the following connection properties, you are ready to connect:

   • InitiateOAuth: Set this to GETANDREFRESH.
   • OAuthJWTCertType: Set this to "PFXFILE".
   • OAuthJWTCert: Set this to the path to the .p12 file you generated.
   • OAuthJWTCertPassword: Set this to the password of the .p12 file.
   • OAuthJWTCertSubject: Set this to "*" to pick the first certificate in the certificate store.
   • OAuthJWTIssuer: In the service accounts section, click Manage Service Accounts and set this field to the email address displayed in the service account Id field.
   • OAuthJWTSubject: Set this to your enterprise Id if your subject type is set to "enterprise" or your app user Id if your subject type is set to "user".
   • ProjectId: Set this to the Id of the project you want to connect to.

   The OAuth flow for a service account then completes.

   For example: ProjectId='project1';

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

         @page "/"
         @using System.Data;
         @using System.Data.CData.GoogleCloudStorage;
         
         <h1>Hello, world!</h1>
         
         Welcome to your Data app.
         
         <div class="row">
             <div class="col-12">
         
                 @using (GoogleCloudStorageConnection connection = new GoogleCloudStorageConnection(
                   "ProjectId='project1';"))
                 {
                     var sql = "SELECT Name, OwnerId FROM Buckets WHERE Name = 'TestBucket'";
                     var results = new DataTable();
         
                     GoogleCloudStorageDataAdapter dataAdapter = new GoogleCloudStorageDataAdapter(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 Google Cloud Storage data as an HTML table in the Blazor app.

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