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Delegate vs Event in C#


In this article we are going to discuss difference between delegates and events in C#. There are many blogs, articles are available on the internet regarding it but in this particular article I will try to explain to you with as much as simplest and realistic so you can get a clear idea of the delegates and events difference in C#.

Some Important Points

  1. The event is a notification mechanism that depends on delegate.
  2. An event is dependent on a delegate and cannot be created without delegates.
  3. Event is like a wrapper over the delegate to improve its security.

Differences Between Delegates and Events in C#

Feature Delegate Event
Definition A type that represents references to methods with a specific parameter list and return type. A special kind of delegate that is used to provide notifications or alerts when something happens.
Usage Defines a method signature and can reference methods with that signature. Used to signal state changes or actions to subscribers, typically in a publisher-subscriber model.
Declaration
public delegate void MyDelegate(int x);
public event MyDelegate MyEvent;
Invocation Can be invoked directly. Can only be invoked within the class that declares it.
Subscribers Can have multiple methods assigned using += or single method using direct assignment. Designed to have multiple subscribers using += to add event handlers.
Access Control Can be accessed and invoked from any part of the code where it is visible. Can be subscribed to by any external class, but can only be invoked from within the declaring class.
Usage Context More general-purpose, can be used anywhere a method reference is needed. Specifically designed for implementing the observer pattern (publish-subscribe model).
Purpose Encapsulates a method or a group of methods. Provides a way to notify multiple subscribers about changes or actions.
Example Usage Sorting algorithms, callback functions. GUI applications, event-driven programming.

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