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

Install the CData ADO.NET Provider for OneNote

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

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

Create a OneNote-Connected Blazor App

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

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.OneNote.dll, typically located at C:\Program Files\CData\CData ADO.NET Provider for OneNote\lib etstandard2.0).
👁 Reference ADO.NET for OneNote .dll in the Blazor app.

SELECT OneNote Data from the Blazor App

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

   OneNote uses the OAuth authentication standard. To authenticate using OAuth, create an app to obtain the OAuthClientId, OAuthClientSecret, and CallbackURL connection properties. See the Help documentation for more information.

   For example: OAuthClientId=MyApplicationId; OAuthClientSecret=MySecretKey; CallbackURL=http://localhost:33333;InitiateOAuth=GETANDREFRESH;

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

    @page "/"
    @using System.Data;
    @using System.Data.CData.OneNote;
    
    <h1>Hello, world!</h1>
    
    Welcome to your Data app.
    
    <div class="row">
    <div class="col-12">
    
    @using (OneNoteConnection connection = new OneNoteConnection(
    "OAuthClientId=MyApplicationId; OAuthClientSecret=MySecretKey; CallbackURL=http://localhost:33333;InitiateOAuth=GETANDREFRESH;"))
    {
    var sql = "SELECT Id, notebook_displayName FROM Notebooks WHERE Id = 'Jq74mCczmFXk1tC10GB'";
    var results = new DataTable();
    
    OneNoteDataAdapter dataAdapter = new OneNoteDataAdapter(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 OneNote data as an HTML table in the Blazor app. 👁 Query OneNote from Blazor app.
   

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