1. WCF Tips and Tricks

3. Components
Contract
Behavior
Endpoint

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