Advanced WCF
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The document discusses several WCF concepts and techniques including streaming, message contracts, duplex contracts, creating WCF clients in code, and service discovery. Streaming allows transferring large data in chunks and is supported by some but not all bindings. Message contracts provide full control over SOAP messages. Duplex contracts enable two-way communication between client and server. Creating WCF clients in code provides more control over proxies. Service discovery features announce services and exchange metadata.
Advanced WCF
- 1. WCF Tips and Tricks
- 4. Streaming • When to use: – Data is too big and the transfer needs to be buffered – Data should be processed by chunks • Limitations: – Supported not in all bindings – Streaming methods can have only one parameter – Session is not supported when streaming data Streaming alternatives? DIY! (do it yourself) You can create several methods that will return data in chunks.
- 5. Message Contracts • When to use: – You need full control of SOAP messages – You want to pass additional information with response (like security, etc.) – You want to add additional information with request, but don’t want to mess the interface for compatibility purposes – Useful together with streaming option
- 6. Duplex Contracts sd Use Case Model WCF Client WCF Service GetData() getcallbackchannel() CallDuplexMethod()
- 7. • When to use: – You need to define two-way communication between client and server – You need to notify client about some event • Limitations: – Duplex behavior is working only within a client session
- 8. Create WCF client in code. • Why? – More control over client proxy – Want to track changes to the WCF client implementation • How? – Use of ClientBase – ChannelFactory
- 9. Service Discovery • Announcement endpoints – Useful to notify other clients about service start/stop • Metadata exchange (mex) – Defines endpoint which provides information about service interface • WS-Discovery – Enables service discovery on the network
- 10. Questions
- 11. Thanks
- 12. Useful links: • Service discovery: http://msdn.microsoft.com/en- us/library/dd456791%28v=vs.110%29.aspx • ClientBase: http://msdn.microsoft.com/ru- ru/library/ms576141%28v=vs.110%29.aspx • ChannelFactory: http://msdn.microsoft.com/ru- ru/library/ms734681%28v=vs.110%29.aspx • Duplex services: http://msdn.microsoft.com/ru- ru/library/ms731064%28v=vs.110%29.aspx • Message contract: http://msdn.microsoft.com/ru- ru/library/ms730255%28v=vs.110%29.aspx • Streaming: http://msdn.microsoft.com/en- us/library/ms733742%28v=vs.110%29.aspx