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LINQ to QuickBooks Online Data

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Complete read-write access to QuickBooks Online enables developers to search (Customers, Transactions, Invoices, Sales Receipts, etc.), update items, edit customers, and more, from any .NET application.

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LINQ offers versatile querying capabilities within the .NET Framework (v3.0+), offering a straightforward method for programmatic data access through CData ADO.NET Data Providers. In this article, we demonstrate the use of LINQ to retrieve information from the QuickBooks Online Data Provider.

This article illustrates using LINQ to access tables within the QuickBooks Online via the CData ADO.NET Data Provider for QuickBooks Online. To achieve this, we will use LINQ to Entity Framework, which facilitates the generation of connections and can be seamlessly employed with any CData ADO.NET Data Providers to access data through LINQ.

See the help documentation for a guide to setting up an EF 6 project to use the provider.

  1. In a new project in Visual Studio, right-click on the project and choose to add a new item. Add an ADO.NET Entity Data Model.
  2. Choose EF Designer from Database and click Next.
  3. Add a new Data Connection, and change your data source type to "CData QuickBooks Online Data Source".

  4. Enter your data source connection information.

    QuickBooks Online uses the OAuth authentication standard. OAuth requires the authenticating user to log in through the browser. To authenticate using OAuth, you can use the embedded OAuthClientId, OAuthClientSecret, and CallbackURL or you can obtain your own by registering an app with Intuit. Additionally, if you want to connect to sandbox data, set UseSandbox to true.

    See the Getting Started chapter of the help documentation for a guide to using OAuth.

  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting QuickBooksOnlineEntities as our entity connection in App.Config.
  6. Enter a model name and select any tables or views you would like to include in the model.

Using the entity you created, you can now perform select , update, delete, and insert commands. For example:

QuickBooksOnlineEntities context = new QuickBooksOnlineEntities(); var customersQuery = from customers in context.Customers select customers; foreach (var result in customersQuery) { Console.WriteLine("{0} {1} ", result.Id, result.DisplayName); }

See "LINQ and Entity Framework" chapter in the help documentation for example queries of the supported LINQ.