And the second candidate is the observer(s), and an observer(s) will subscribe to get notification on the state change of the subject. The first candidate is a subject, which is the main object whose state change is what we want to observe. The observer pattern has two main candidates. And the second implementation is using a feature that is more recent. NET which is available since the inception of the. The first implementation is using the features of. The implementation of the observer patternįor this demonstration, I am going to do a couple of implementations of observer patterns for the. And if you ever work on user interface applications this is something you will definitely use. The observer pattern is supported out of the box by. In simple language, what the above statement means is creating a notification relationship between one object with other objects who are interested in knowing the state change of that particular object. The main intent of this pattern is to define a one-to-many dependency between objects so that when one object changes its state all the objects dependent on it are notified automatically. And the observer pattern is a behavioral design pattern. The observer pattern is a design pattern from the Gang Of Four design patterns.
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