What Improvements does WCF offers over its earlier counterparts?
A lot of communication approaches exist in the .NET Framework 2.0 such as ASP.NET Web Services, .NET Remoting, System.Messaging supporting queued messaging through MSMQ, Web Services Enhancements (WSE) - an extension to ASP.NET Web Services that supports WS-Security etc. However, instead of requiring developers to use a different technology with a different application programming interface for each kind of communication, WCF provides a common approach and API.
What are WCF features and what communication problems it solves?
WCF provides strong support for interoperable communication through SOAP. This includes support for several specifications, including WS-Security, WS-ReliableMessaging, and WS-AtomicTransaction. WCF doesn't itself require SOAP, so other approaches can also be used, including optimized binary protocol and queued messaging using MSMQ. WCF also takes an explicit service-oriented approach to communication, and loosens some of the tight couplings that can exist in distributed object systems, making interaction less error-prone and easier to change. Thus, WCF addresses a range of communication problems for applications. Three of its most important aspects that clearly stand out are:
Unification of Microsoft's communication technologies.
Support for cross-vendor interoperability, including reliability, security, and transactions.
Rich support for service orientation development.
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