What is delegates and events in C# with example?

Delegates in C# are similar to the function pointer in C/C++. It provides a way which tells which method is to be called when an event is triggered. For example, if you click on a Button on a form (Windows Form application), the program would call a specific method.

What is a delegate and event?

A delegate is a way of telling C# which method to call when an event is triggered. For example, if you click a Button on a form, the program would call a specific method. It is this pointer that is a delegate. Delegates are good, as you can notify several methods that an event has occurred, if you wish so.

What is an event in C# net?

C# – Events. An event is a notification sent by an object to signal the occurrence of an action. Events in . NET follow the observer design pattern. The class who raises events is called Publisher, and the class who receives the notification is called Subscriber.

What is an event in asp net?

An event is an action or occurrence such as a mouse click, a key press, mouse movements, or any system-generated notification. A process communicates through events. For example, interrupts are system-generated events. When events occur, the application should be able to respond to it and manage it.

Why do we use events in C#?

Events enable a class or object to notify other classes or objects when something of interest occurs. The class that sends (or raises) the event is called the publisher and the classes that receive (or handle) the event are called subscribers.

What is the relationship between events and delegates in C#?

Event is a notification raised by an object to signal the occurrence of an action. Delegate is associated with the event to hold a reference of a method to be called when the event is raised.

What is an event handler in C#?

Event handlers in C# An event handler in C# is a delegate with a special signature, given below. public delegate void MyEventHandler(object sender, MyEventArgs e); C# Copy. The first parameter (sender) in the above declaration specifies the object that fired the event.

What is the difference between delegate and event in C #?

The following table lists the difference between the delegate and the event in C#. A delegate is declared using the delegate keyword. An event is declared using the event keyword. Delegate is a function pointer. It holds the reference of one or more methods at runtime. Delegate is independent and not dependent on events.

How to add or remove methods to a delegate invocation list?

You don’t need to build custom methods to add or remove methods to a delegate invocation list. C# provides the event keyword. When the compiler processes the event keyword, you can subscribe and unsubscribe methods as well as any necessary member variables for your delegate types.

How do I assign a method to a delegate in C?

C#. public delegate int PerformCalculation(int x, int y); Any method from any accessible class or struct that matches the delegate type can be assigned to the delegate. The method can be either static or an instance method. This makes it possible to programmatically change method calls, and also plug new code into existing classes.

What are the properties of delegate in C++?

Delegates have the following properties: Delegates are similar to C++ function pointers, but delegates are fully object-oriented, and unlike C++ pointers to member functions, delegates encapsulate both an object instance and a method. Delegates allow methods to be passed as parameters.