What is the difference between an event and a delegate?
An event is just a wrapper for a multicast delegate. Adding a public event to a class is almost the same as adding a public multicast delegate field. In both cases, subscriber objects can register for notifications, and in both cases the publisher object can send notifications to the subscribers. However, a public multicast delegate has the undesirable property that external objects can invoke the delegate, something we’d normally want to restrict to the publisher. Hence events – an event adds public methods to the containing class to add and remove receivers, but does not make the invocation mechanism public. See this post by Julien Couvreur for more discussion.
An event is just a wrapper for a multicast delegate. Adding a public event to a class is almost the same as adding a public multicast delegate field. In both cases, subscriber objects can register for notifications, and in both cases the publisher object can send notifications to the subscribers. However, a public multicast delegate has the undesirable property that external objects can invoke the delegate, something we’d normally want to restrict to the publisher. Hence events – an event adds public methods to the containing class to add and remove receivers, but does not make the invocation mechanism public. See this post by Julien Couvreur for more discussion.
