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https://stackoverflow.com/questions/2551366/wcf-silverlight-is-request-reply-possible-over-pollingduplexhttpbinding
We have methods that do not return results that allow clients to subscribe to some data feed then then the service pushes data back via CallBack contracts. Just now we have been adding some Request/Reply methods to our OperationContract. As the clients are Silverlight 3 these methods are called using the async Begin() End() pattern.
https://weblogs.asp.net/dwahlin/pushing-data-to-a-silverlight-client-with-wcf-duplex-service-part-i
Jun 16, 2008 · Pushing Data to a Silverlight Client with a WCF Duplex Service - Part I. Monday, June 16, 2008 ... Many of the WCF services out there follow the simple request-response mechanism to exchange data which works well for many applications. ... "The duplex support does use polling in the background to implement notifications – although the way it ...
https://petermcg.wordpress.com/2008/09/03/silverlight-polling-duplex-part-2-the-server/
Sep 03, 2008 · Edited on 20/October/2008 : Code download updated to support Silverlight 2 RTW (Code download)Introduction. This is the second in a series of posts on the support for duplex communication with a WCF service added to Silverlight 2 Beta 2.. I should point out that this technology in its current form has been deemed by Microsoft as not yet fit for production applications and is …
https://stackoverflow.com/questions/14225888/getting-an-error-contract-requires-duplex-but-binding-basichttpbinding-doesn
The service '/ServerService.svc' cannot be activated due to an exception during compilation. The exception message is: Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it.
https://answers.microsoft.com/en-us/windows/forum/windows_7-windows_programs/microsoft-silverlight/1430f141-2b58-42e3-bb67-a59a75af025b
Nov 26, 2012 · Microsoft Silverlight I am trying to open photos, etc or trying to reply to an email on Outlook and I get the message to let Microsoft to open Microsoft Silverlight . The request box does not respond plus it freezes the computer where I have to end the task in my Task Manager.
http://www.drdobbs.com/web-development/pushing-data-to-a-silverlight-client-wit/208700791
The Silverlight SDK states the following about how communication works between a Silverlight client and a duplex service: The Silverlight client periodically polls the service on the network layer, and checks for any new messages that the service wants to send on the callback channel.
https://www.codeproject.com/articles/262164/using-wcf-service-with-silverlight
Sep 30, 2011 · In one of our products, we had to use WCF service with Silverlight. While working on Silverlight and WCF, I found out some very interesting things and I feel that those are worth sharing. Whenever we want to work with Silverlight and need some kind of service communication, we would encounter those common problems.4.8/5(15)
https://www.dotnetcurry.com/wcf/721/push-data-wcf-callback-service
BasicHttpBinding and WSHttpBinding do not support callback. To support callback over HTTP transport, WCF provides WSDualHttpBinding. The WSDualHttpBinding sets up two channel - one for calls from client to service and other from service to client. Whenever you create a Service, it can have only one callback contract.
https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/how-to-create-a-duplex-contract
If the channel is not secured, then an untrusted client could send a malicious message with a target machine's ReplyTo, leading to a denial of service of the target machine. With regular request-reply messages, this is not an issue, because the ReplyTo is ignored and the response is sent on the channel the original message came in on. See also
https://tomasz.janczuk.org/2009/11/wcf-nettcp-protocol-in-silverlight-4.html
Net.tcp protocol in Silverlight does not support transport level security (i.e. it does not offer SSL protection). As such its use is limited to applications where security is not a requirement or the desired level of security is inherent in the environment the application is running in.
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