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.NET Forum / .NET Framework / CLR / July 2003Events: Do they lead to memory leaks?
Hi all I have the following scenario in brief: There are two classes EventRaiser and EventConsumer. The EventRaiser raises an event and EventConsumer listens to it, by adding its handler to the event chain of the EventRaiser's event delegate. My question is: If the EventConsumer goes out of context, without removing itself from the event chain, does the EventRaiser still have its reference through the event chain? Will it not be garbage collected? Regards RK > Hi all > [quoted text clipped - 4 lines] > removing itself from the event chain, does the EventRaiser still have its > reference through the event chain? Yes >Will it not be garbage collected? It will not be garbage collected. David Hi David Thanks for the response. I have got few more questions for you: How to take care of the memory leaks in such cases? Are there in safeguards in .Net against it, except good programming practices? How about using WeakReferences to link the two Event objects? Regards Rahul > > Hi all > > [quoted text clipped - 14 lines] > > David > Hi David > [quoted text clipped - 4 lines] > practices? > How about using WeakReferences to link the two Event objects? Well that's not how events are implemented, but they could have been. If you used interfaces instead of events, you could use weak references to notitify the object without keeping it from being collected. But only good programming prevents this. You might make your objects Disposable, and remove the event handler in the Dispose method. David Weak references could have worked in this situation. Bear in mind that it's only really an issue when your object is hooking onto an event in another object which has a significantly longer life span. But it can be a really nasty situation, especially if it's not you hooking up the event, but something in the framework, and your object ends up being referenced through a static hashtable or similar. Niall > Hi David > [quoted text clipped - 30 lines] > > > > David Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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