NET Framework Version 3.5, Windows Communication Foundation,WCF and WF Integration—Workflow Services,Durable Services,WCF Web Programming Model,WCF and Partial Trust,WCF and ASP.NET AJAX Integration,Web Services Interoperability,

iV).Windows Communication Foundation

1).WCF and WF Integration—Workflow Services

The .NET Framework 3.5 unifies the Windows Workflow Foundation (WF) and Windows Communication Foundation (WCF) frameworks so that you can use WF as a way to author WCF services or expose your existing WF workflow as a service. This enables you to create services that can be persisted, can easily transfer data in and out of a workflow, and can enforce application-level protocols. For code samples, see Workflow Services Samples.

2).Durable Services

The .NET Framework 3.5 also introduces support for WCF services that use the WF persistence model to persist the state information of the service. These durable services persist their state information on the application layer, so that if a session is torn down and re-created later, the state information for that service can be reloaded from the persistence store.

3).WCF Web Programming Model

The WCF Web Programming Model enables developers to build Web-style services with WCF. The Web Programming Model includes rich URI processing capability, support for all HTTP verbs including GET, and a simple programming model for working with a wide variety of message formats (including XML, JSON, and opaque binary streams). For more information, see WCF Web Programming Model Overview.

4).WCF Syndication

WCF now includes a strongly typed object model for processing syndication feeds, including both the Atom 1.0 and RSS 2.0 formats. For more information, see WCF Syndication. For code samples, see Syndication Samples.

5).WCF and Partial Trust

In .NET Framework 3.5, applications running with reduced permissions can use a limited subset of WCF features. Server applications running with ASP.NET Medium Trust permissions can use the WCF Service Model to create basic HTTP services. Client applications running with Internet Zone permissions (such as XAML Browser Applications or unsigned applications deployed with ClickOnce) can use the WCF proxies to consume HTTP services. In addition, the WCF Web Programming Model features (including AJAX and Syndication) are available for use by partially trusted applications. For more information, see Partial Trust.

6).WCF and ASP.NET AJAX Integration

The integration of WCF with the Asynchronous JavaScript and XML (AJAX) capabilities in ASP.NET provides an end-to-end programming model for building Web applications that can use WCF services. In AJAX-style Web applications, the client (for example, the browser in a Web application) exchanges small amounts of data with the server by using asynchronous requests. Integration with AJAX features in ASP.NET provides an easy way to build WCF Web services that are accessible by using client JavaScript in the browser. For more information, see ASP.NET AJAX Integration and JSON Support. For code samples, see AJAX Samples.

7).Web Services Interoperability

In the .NET Framework 3.5, Microsoft maintains its commitment to interoperability and public standards and introduces support for the new secure, reliable, and transacted Web services standards:

·         Web Services Reliable Messaging v1.1

·         Web Services Reliable Messaging Policy Assertion v1.1

·         WS-SecureConversation v1.3

·         WS-Trust v1.3

·         WS-SecurityPolicy v1.2

·         Web Services Atomic Transaction (WS-AtomicTransaction) Version 1.1

·         Web Services Coordination (WS-Coordination) Version 1.1

·         Web Services Policy 1.5 - Framework

·         Web Services Policy 1.5 - Attachment

Implementation of these protocols is made available using the new standard bindings, ws2007HttpBinding and ws2007FederationHttpBinding, which are documented in the Web Services Protocols Interoperability Guide. For a code sample, see WS Binding Samples.