c# -- event 가 null 인 경우



참고: https://bytes.com/topic/c-sharp/answers/564785-when-event-null

       https://codeblog.jonskeet.uk/2015/01/30/clean-event-handlers-invocation-with-c-6/




event 구독자가 없는 경우에는 null 이다. 


an event with no subscribers is usually represented as a null reference. 




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