Events in C#

Operators, Delegates, and Events - slide 13 : 20

Events in C#

From inside some class, an event is a variable of a delegate type.

From outside a class, it is only possible to add to or remove from an event.

Events are intended to provide notifications, typically in relation to graphical user interfaces.

Restrictions on events
- An event can only be activated from within the class to which the event belongs
- From outside the class it is only possible to add (with +=) or subtract (with -=) operations to an event.
  - It is not possible to 'reset' the event with an ordinary assignment

There exists a generic delegate EventHandler<TEVentArgs> which is intended to be used as the type of standard events in .NET