This document discusses Windows Communication Foundation (WCF) basics including message exchange patterns like duplex messaging. Duplex messaging allows both the client and server to exchange messages through the use of a callback contract and the wsDualHttpBinding binding. It provides advantages over alternatives by supporting protocols besides HTTP, hosting outside a web server, and enabling transactions and reliable sessions. The document also covers WCF runtime architecture, endpoints, address, binding and contract, and provides examples of one-way, request-reply, and duplex services.

1. Dinusha Kumarasiri

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WCF Basics
Message Exchange Patterns
Duplex Message Exchange
Advantages of Duplex Messaging

3. • WCF Provide runtime environment for
Services
Message
Client
Service
Message

4. • Advantages over other alternatives
– Support protocols other than http
– Host in other than web server
– Transactions and reliable sessions
– Message formats other than SOAP

5. • Endpoints
Service
Client 1
End point 1
End point 2
Message
End point 1
Client 2
Message
End point 2

6. • ABC of WCF
• Address – Where ?
• Binding – How?
• Contract – What?

7. • Channel

8. • WCF runtime architecture

9. • Request-Reply

10. WCF Hello Service

11. • One-Way

12. WCF Hello Service

13. • Duplex

14. • Both client and server can exchange messages
• Use callback contract to call to client
• Use “wsDualHttpBinding” binding

15. WCF Marks Service

16. • Alternative for client polling
• Enhanced performance
• Integration with Silverlight

17. WCF Chat

18. Q&A

19. Thank You !