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Easy-to-use OData client (consumer) enables developers to build .NET applications that easily communicate with OData services.

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LINQ to OData Services


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 OData Data Provider.

This article illustrates using LINQ to access tables within the OData via the CData ADO.NET Data Provider for OData. 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 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.