C# 6.0 Pocket Reference by Joseph Albahari
Author:Joseph Albahari
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2015-10-16T00:00:00+00:00
public delegate void EventHandler<TEventArgs> (object source, TEventArgs e) where TEventArgs : EventArgs;
Note
Before C# 2.0 (when generics were added to the language) the solution was to instead write a custom event handling delegate for each EventArgs type as follows:
delegate void PriceChangedHandler (object sender, PriceChangedEventArgs e);
For historical reasons, most events within the Framework use delegates defined in this way.
A protected virtual method, named On-event-name, centralizes firing of the event. This allows subclasses to fire the event (which is usually desirable) and also allows subclasses to insert code before and after the event is fired.
Hereâs how we could use our Stock class:
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