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I have such usecase:
In my application some instances need to fire event, that they have been changes. But, I dont want to keep references to instances that need to be changed, so I would like to send event and somehow listen it in some places, but how to do it in C# in windows phone?
You’re looking for the EventAggregator. There are a few toolkits that you can build upon like GalaSoft’s MVVM Light and Caliburn Micro. You can find a good example of this at http://www.mindscapehq.com/blog/index.php/2012/02/01/caliburn-micro-part-4-the-event-aggregator/.
The basic gist of it is to inject an EventAggregator into your ViewModel. This ViewModel would Publish an event. Other ViewModels would subscribe to this event.