Events:

  • An event is a mechanism that enables objects to notify other objects when something of interest happens.
  • Events are based on delegates and provide a way to handle and respond to specific occurrences or changes in the program.
  • Events follow the publisher-subscriber model, where the object raising the event is the publisher, and the object handling the event is the subscriber.
  • Events are declared using the event keyword.

Example:

public class Publisher

{

    public event EventHandler MyEvent;

    public void RaiseEvent()

    {

        OnMyEvent(EventArgs.Empty);

    }

    protected virtual void OnMyEvent(EventArgs e)

    {

        MyEvent?.Invoke(this, e);

    }

}

public class Subscriber

{

    public void HandleEvent(object sender, EventArgs e)

    {

        Console.WriteLine(“Event handled by the subscriber”);

    }

}

// Usage:

Publisher pub = new Publisher();

Subscriber sub = new Subscriber();

pub.MyEvent += sub.HandleEvent;

pub.RaiseEvent();

// Output:

// Event handled by the subscriber

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