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LINQ to OData Services

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 OData Data Provider.

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

    The User and Password properties, under the Authentication section, must be set to valid OData user credentials. In addition, you will need to specify a URL to a valid OData server organization root or OData services file.

    Below is a typical connection string:

    URL=http://services.odata.org/V4/Northwind/Northwind.svc;UseIdUrl=True;OData Version=4.0;Data Format=ATOM;
  5. If saving your entity connection to App.Config, set an entity name. In this example we are setting ODataEntities 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:

ODataEntities context = new ODataEntities(); var ordersQuery = from orders in context.Orders select orders; foreach (var result in ordersQuery) { Console.WriteLine("{0} {1} ", result.Id, result.OrderName); }

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