What's New in Orcas
The official list
is a little hard to find but here's the overview of the big new WCF features in
Orcas.
- 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 more information, see Creating Workflow Services and
Durable Services. For code samples, see Workflow Services Samples.
- 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. For more information, see Creating Workflow Services and
Durable Services. For a code sample, see Durable Service Sample.
- 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 Web Programming Model. For
code samples, see Web Programming Model Samples.
- 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.
- 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. For code
samples, see Partial Trust WCF Samples.
- 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 AJAX Integration and JSON
Support. For code samples, see AJAX Samples.
- 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,
and 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.
