Duplex Communication with WCF in Silverlight 4 (Silverlight TV #34)

Posted By: John Papa | Jun 24th @ 10:01 AM | 48,604 Views | 16 Comments

In this episode, Tomasz Janczuk of the Silverlight Web Services team joins John to demonstrate how to implement duplex communication with WCF in Silverlight. Tomasz discusses a how to implement a chat application using WCF, the basics of the polling duplex protocol, when the Net.tcp protocol is ideal, and some performance and scalability considerations.

 

 

Relevant links:

Follow us on Twitter @SilverlightTV or on the web at http://silverlight.tv/

 
Rating:
2
0
#Jun 24th @ 2:12 PM
SDFusion
SDFusion

Hi Guys,

A question regarding the web services and Silverlight. Would you be able to shed some light on why there is no support for WSHttpBinding in Silverlight please?

 

Thank you,

Yosh

#Jun 24th @ 3:01 PM
tjanczuk
tjanczuk

Yosh, 

Silverlight supports a good subset of BasicHttpBinding functionality. The major value add of WSHttpBinding over BasicHttpBinding is supoport for WS-Security and WS-ReliableMessaging. Given substantial demand, we are looking into enabling a subset of WS-Security capabilities in the future release of Silverlight. 

Thanks,

Tomasz Janczuk

#Jun 24th @ 4:39 PM
SDFusion
SDFusion

Thank you for the quick reply Thomasz. I work for a law enforcement agency and we were looking at creating a Silverlight application for the patrol cars. The application will enhance the current capablities of the law enforcement officers. Security is paramount to us. I will keep up with the future releases and hope to see the WSHttpBinding support.

 

Thank you very much,

Yosh

#Jun 24th @ 5:41 PM
chanmm
chanmm

Where can we download the sample?

#Jun 24th @ 6:17 PM
tjanczuk
tjanczuk

Yosh,

 

I wonder which particular security features from WSHttpBinding you are interested in?

#Jun 24th @ 6:19 PM
tjanczuk
tjanczuk

A sample chat application similar to the one shown in the video can be downloaded from http://tomasz.janczuk.org/2009/07/pubsub-sample-using-http-polling-duplex.html. More resources related to polling duplex are at my blog at http://tomasz.janczuk.org. 

#Jun 25th @ 4:15 AM
Ben Hayat
Ben Hayat

John, I'm very happy to see you poking into this area of SL. And much thanks to Tomasz for his solid knowlege. I think [at least personally] the communication power of SL has not been explored fully and I hope to see more series of this type of materials.

..Ben

#Jun 25th @ 5:02 AM
Ben Hayat
Ben Hayat

Tomasz, although the sample on your blog was built with/for SL3, but I heard you pointed out many things that are new features in SL4, so it might be best to have a SL4 version of the sample.

 

Thanks!

..Ben

#Jun 25th @ 8:13 AM
JSkimming
JSkimming

Hi Tomasz,

 

Does the WCF duplex communication with Silverlight work in a web farm and on Azure?

 

Regards,

 

James.

 

Microsoft Communities