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What is an event, and how does it differ from a plain public delegate field? What are multicast delegates, and in what order do their subscribed methods get invoked? How does variable capture (closures) work in a C# lambda expression, and what pitfall occurs when capturing a loop variable? What causes event-handler memory leaks and how do you prevent them? How do the built-in Func<>, Action<>, and Predicate<T> generic delegate types differ, and when would you use each? How would you implement the 'weak event pattern' to prevent event subscribers from causing a memory leak by keeping the publisher alive indefinitely? How does a lambda expression get compiled differently when it captures NO outer variables versus when it DOES capture outer state? How do delegate covariance and contravariance work with method group conversions in C#? How would you implement a custom EventHandler using async/await, avoiding the common 'async void' anti-pattern while still matching the standard EventHandler delegate signature?
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What is the difference between multicast delegate invocation and exception handling?

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Answer

A multicast delegate invokes subscribers in order; if one throws, later subscribers are skipped and the exception propagates. Invoke manually via GetInvocationList to isolate failures.
foreach (var d in handler.GetInvocationList().Cast<Action>())
    try { d(); } catch (Exception ex) { Log(ex); }
Real-world example Notifying many listeners where one failing listener must not block the rest.
All 17 Delegates, Events & Lambdas questions