WCF Essentials—What Is WCF?
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What Is WCF?
Windows Communication Foundation (WCF) is an SDK for developing and deploying
services on Windows. WCF provides a runtime environment for your services,
enabling you to expose CLR types as services, and to consume other services as CLR
types. Although in theory you could build services without WCF, in practice building
services is significantly easier with WCF. WCF is Microsoft’s implementation of
a set of industry standards defining service interactions, type conversion, marshaling,
and various protocols’ management. Because of that, WCF provides interoperability
between services. WCF provides developers with the essential off-the-shelf
plumbing required by almost any application, and as such, it greatly increases productivity.
The first release of WCF provides many useful facilities for developing services,
such as hosting, service instance management, asynchronous calls, reliability,
transaction management, disconnected queued calls, and security. WCF also has an
elegant extensibility model that you can use to enrich the basic offering. In fact,
WCF itself is written using this extensibility model. The rest of the chapters in this
book are dedicated to those aspects and features. Most all of the WCF functionality
is included in a single assembly called
System.ServiceModel.dll in the
WCF is part of .NET 3.0 and requires .NET 2.0, so it can only run on operation systems that support it. Presently this list consists of Windows Vista (client and server), Windows XP SP2, and Windows Server 2003 SP1 or their later versions.