Real Wcf Duplex Communication ,How?

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Hi I read some articles about duplex communication and using callbacks but the way i seen it, it was always like this: callBacks used in a OperationContract. so when a client calls a OperationContract, the service calls back for the client.
but i want the opposite situation. the server sends a request and client should answer it.
in the described wcf duplex communication client requests for a service, and server sends some notification to client using callback. but i want Server start this process and send a request to client,then client answer to server.
now my client checks for new requests every 5 sec.
please help me.
thanks

Posted 18-May-12 19:20pm

mahdi87_gh

Updated 19-May-12 21:10pm

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**Zoltán Zörgő** · Answer 1 · 2012-05-19T03:22:00

Solution 1

As you can read also here (http://msdn.microsoft.com/en-us/library/cc645026(v=vs.95).aspx[^]), this functionality depend on the transport protocol you use. Since http uses a tipical request-replay scenario and in most cases the port opened for listening on client side would be inaccessible to the server, you have only this polling mechanism. But if your environment enables you to use WCF over TCP, than you will have a real duplex communication.

Posted 19-May-12 3:22am

Zoltán Zörgő

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mahdi87_gh 19-May-12 10:36am

thanks i will read it and come back

mahdi87_gh 20-May-12 0:40am

the link you provide isn't what i mean and also it describe for a Silverlight client application.
in the described wcf duplex communication client requests for a service, and server sends some notification to client using callback. but i want Server start this process and send a request to client,then client answer to server

Zoltán Zörgő 20-May-12 7:07am

What kind of binding are you using? http, msmq, namedpipe, tcp..?

mahdi87_gh 20-May-12 23:29pm

it doesn't matter for me. I'll use it in a Local Lan

Zoltán Zörgő 2-Jun-12 12:08pm

Here is something really interesting for you: http://codesamples.codeplex.com/releases/view/88717