Difference between registering delegate and registering named method for event?

Once you subscribed a delegate this way (you can unsubscribe using - operator if you cache the delegate variable somewhere) you can't remove it from subscribers list and it will be invoked every time event rises until publisher is alive. Moreover this subscription will prevent any subscriber class (class which contains the method you subscribed to event) from garbage collection until publisher is alive (unless you use a static method).

You can unsubscribe a delegate if you keep a reference to it.

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