What are delegates and events

Delegates and events are essential components of the C# programming language, allowing for a more event-driven programming style. A delegate is a type that represents references to methods with a specific parameter list and return type. Events are built on top of delegates, providing a way for a class to notify other classes or objects when something of interest occurs.

Delegates can be thought of as type-safe function pointers, enabling methods to be passed as parameters. Events use delegates to provide notification capabilities to subscribers when an event occurs.

Example of Delegate and Event


        // Define a delegate
        public delegate void Notify();  

        // Define a class that uses the delegate
        public class ProcessBusinessLogic
        {
            // Declare the event using the delegate
            public event Notify ProcessCompleted;

            public void StartProcess()
            {
                // Some process logic here
                Console.WriteLine("Process Started!");

                // Raise the event
                OnProcessCompleted();
            }

            protected virtual void OnProcessCompleted()
            {
                ProcessCompleted?.Invoke();
            }
        }

        // Subscriber class
        public class Subscriber
        {
            public void Subscribe(ProcessBusinessLogic process)
            {
                process.ProcessCompleted += ProcessCompletedHandler;
            }

            private void ProcessCompletedHandler()
            {
                Console.WriteLine("Process Completed!");
            }
        }

        // Main program
        public class Program
        {
            static void Main(string[] args)
            {
                ProcessBusinessLogic process = new ProcessBusinessLogic();
                Subscriber subscriber = new Subscriber();

                subscriber.Subscribe(process);
                process.StartProcess();
            }
        }

delegates events C# programming event-driven method references notifications

What are delegates and events

Example of Delegate and Event

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What are delegates and events

Example of Delegate and Event

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