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The following new Open Data Protocol (OData) version 2.0 functionality is supported in this release of WCF Data Services:

Counting entities in an entity set

A new $count path segment enables you to receive only the total number of resources returned by a URI. A new $inlinecount query option enables you to receive the same total resource count together with the resource data in a single response.

The .NET Framework client library has been updated to enable you to access this row count information in a query response in your application.

Query Projections

Query results can now be modified to include only a subset of properties by using the new $select query option.

The .NET Framework client library has been updated to support projection by using the select clause (Select in Visual Basic) in a LINQ query.

Partial Entity Sets

A data service can now return a partial list of the entities requested by a URI, together with a URI that is used to obtain the next set of entities in the result. The new $skiptoken query option is used to request the next page of results.

The following functionality is new in this release of WCF Data Services:

Server-driven paging

A data service can now be configured to return requested resources as a set of paged responses.

The .NET Framework client library has been updated to enable you to handle paged responses.

Data binding

A new DataServiceCollection class provides simplified binding of data service data to Windows Presentation Framework (WPF) controls. This class inherits from the ObservableCollection class to automatically update bound data when there are changes to data in bound controls.

Streaming of binary resources

An entity can be defined as media link entry, with a link to an associated media resource. This enables you to retrieve and save binary large object data independent of the entity to which it belongs. You can create a data service that returns binary property data as a stream instead of first loading the entire entity, including binary data, into memory. Do this by implementing the IDataServiceStreamProvider interface.

The .NET Framework client library has been updated to allow you to get and set binary properties as a data stream.

Custom data service providers

By implementing a set of new data service provider interfaces, you can use various types of data with a data service, even when the data model changes during execution.

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