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If I have a WCF server app that need to inform WCF client that some action should be done (for example “redraw user interface”) what would be the best method to achieve this? Is there any “event” mechanism i can use to inform a client that it should perform some action?
Yes you could do callbacks – but not for all bindings. IMHO it’s better to either let the client poll or let the client itself decide if it should do anything.
If this is for games or whatever I would reconsider using WCF in the first place (performance).