What is delegate and events in C#?

What is delegate and events in C#?

A delegate is an object which refers to a method or you can say it is a reference type variable that can hold a reference to the methods. 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.

How are events and delegates associated in the .NET framework?

NET Framework is based on having an event delegate that connects an event with its handler. To raise an event, two elements are needed: A delegate that identifies the method that provides the response to the event. Optionally, a class that holds the event data, if the event provides data.

Why are delegates used?

Delegates allow methods to be passed as parameters. Delegates can be used to define callback methods. Delegates can be chained together; for example, multiple methods can be called on a single event. Methods don’t need to match the delegate signature exactly.

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.

What is difference between event and delegate?

A delegate specifies a TYPE (such as a class , or an interface does), whereas an event is just a kind of MEMBER (such as fields, properties, etc). And, just like any other kind of member an event also has a type. Yet, in the case of an event, the type of the event must be specified by a delegate.

What are events and delegates in C #?

Events and Delegates in C# are undoubtedly among the most confusing topics. Let us explore more about these. The code used in this article can be downloaded from GitHub. Delegates are function pointers. Let’s write some code using delegates to understand delegates.

What is the difference between event events and delegates?

Events are nothing but encapsulated delegates. (More on this later) Methods cannot be passed as parameters to other methods. But delegates can be passed as method parameters. Delegate help us reduce coupling.

What is the use of delegate in system delegate?

It holds the reference of a method. All delegates are derived from System.Delegate class. The SendMessage delegate shown above, can be used to point to any method that has same return type & parameters declared with SendMessage. What is Event?

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.