Which design pattern does c# delegate and event belong to?

Delegates and events belong to the observer pattern in behavioral design patterns, where delegates act as observers and events act as subjects. This pattern defines a one-to-many dependency relationship. Observers will be notified when the topic status changes, and the observers can update their status accordingly.

Which design pattern do delegates and events belong to?

Delegates and events belong to the behavioral design patternObserver Pattern.

Observer Pattern

The Observer pattern defines a one-to-many dependency relationship, in which one object (called a subject or publisher) and multiple objects (called for observers or subscribers) are connected to each other. When a topic's status changes, it notifies all observers, and observers can update their status accordingly.

The role of delegates and events in the observer pattern

In C#, delegates play the role of observers. It is a type-safe reference to a method that can be passed as a parameter to other methods. By using delegates, multiple methods can subscribe to the same event.

Events act as themes. It represents the state changes that may occur in a class. When an event occurs, all subscribed delegates are called, thereby notifying observers of the change in state.

Benefits of the Observer Pattern

• Loose coupling: The observer and the subject are loosely coupled. The subject only needs to know the delegate of the observer, not the specific implementation of the observer.
• Extensibility: Observers can be easily added or removed without modifying the topic or other observers.
• Reusability: Delegates and events can be reused by multiple topics and observers.

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