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AnswerRe: What is the correct code to invoke subscribers for an event? Pin
BillWoodruff23-Jul-16 21:31
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BillWoodruff23-Jul-16 22:03
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Richard MacCutchan24-Jul-16 1:31
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BillWoodruff24-Jul-16 2:59
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Richard Deeming24-Jul-16 22:15
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AnswerRe: What is the correct code to invoke subscribers for an event? Pin
Pete O'Hanlon23-Jul-16 23:43
mvaPete O'Hanlon23-Jul-16 23:43 
Imagine your system has an event with one subscriber. This subscriber is on a background thread. Now, consider the case where the very last action before context switching over to the thread your subscriber is on is to check to see if you have any subscriptions. That's fine as the null check will tell you that you have a subscriber.

Okay, you're now processing on this other thread and the first thing it does is to remove the event subscription. You now have nothing hooked up to the event but when you context switch back, it's going to continue as though there are subscriptions. That's why you take the copy.
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