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LINQ to Google Contacts 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 Google Contacts Data Provider.

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

    You can connect to Google APIs on behalf of individual users or on behalf of a domain. Google uses the OAuth authentication standard. See the "Getting Started" section of the help documentation for a guide.

  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting GoogleContactsEntities 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:

GoogleContactsEntities context = new GoogleContactsEntities(); var friendsQuery = from friends in context.Friends select friends; foreach (var result in friendsQuery) { Console.WriteLine("{0} {1} ", result.Id, result.Summary); }

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