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Observer pattern

Created: 05.06.10 Modified: 05.06.10 Code Snippets - Design Patterns
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Goal

A subject object, maintains a list of its dependants, called observers, and notifies them automatically of any state changes.

UML

Observer pattern

C#

2 alternatives (More information here):

  1. Using interfaces like IObserver and IObervable and make interface calls
  2. Use an event in the subject and delegates. Observers register on this event.

The second option is completely integrated in the .NET CLR.


Last Updated on Sunday, 05 September 2010 16:50
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