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LINQ to FreshBooks 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 FreshBooks Data Provider.

This article demonstrates how to use LINQ to access FreshBooks tables through the CData ADO.NET Data Provider for FreshBooks. 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 FreshBooks Data Source".
  4. Enter your data source connection information.

    To connect to FreshBooks, you can set the CompanyName and Token connection properties. Alternatively, you can use the OAuth authentication standard.

    OAuth can be used to enable other users to access their own company data. To authenticate using OAuth, you will need to obtain the OAuthClientId and OAuthClientSecret by registering an app. See the "Getting Started" chapter of the help documentation for a guide to using OAuth.

    Below is a typical connection string:

    CompanyName=CData;Token=token;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting FreshBooksEntities 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:

FreshBooksEntities context = new FreshBooksEntities(); var clientsQuery = from clients in context.Clients select clients; foreach (var result in clientsQuery) { Console.WriteLine("{0} {1} ", result.Id, result.Username); }

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