How does a C # eventhandler work internally?

Question

I assume that C # evenhandler has a list of listeners, and it iterates through the list when sending a message. My question is how it works internally. Does he make a copy of the list before his cycle, and if so, what happens if someone unregisters after the list has been copied, but he has not yet received the message.

Will I still receive a message, even if it unregisters?

Answer 1

The delegate is immutable, so when you call the delegate, the list of subscribers is known and fixed. Subscribing or unsubscribing replaces the delegate who backs up the event.

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2, ( -ref ):

var handler = SomeEvent;
// <===== another thread could unsubscribe at this point
if(handler != null) handler(sender, args); // <== or part way through this invoke
// (and it either case, have the event trigger even though they think they have
// unsubscribed)

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