Does IEventAggregator subscribe multiple times?

If I have the following Microsoft.Practices.Prism.Events.IEventAggregator instan开发者_StackOverflow社区ce:

eventAggregator.GetEvent<MyEvent>.Subscribe(SomeMethod);

and the above line of code is hit multiple times, does EventAggregator check if there is already a subscribtion or will this keep subscribing and fire multiple times (everytime) for a single Publish()?

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It should subscribe multiple times. The Subscribe method returns a SubscriptionToken which should be distinct even if you use the call the Subscribe with the same method multiple times, allowing you to remove a distinct reference if you choose to do so.