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LINQ to QuickBooks Online Data

LINQ provides general-purpose query facilities in .NET Framework 3.0 and above and provides one easy way to programmatically access data through from CData ADO.NET Data Providers. This example uses LINQ to access information from the QuickBooks Online Data Provider.

This article demonstrates how to use LINQ to access QuickBooks Online tables through the CData ADO.NET Data Provider for QuickBooks Online. To do this you will LINQ to Entity Framework, which is used to generate the connection and can be used with any CData ADO.NET Data Providers to access data via 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.