Why we need events for callback?

Question

We can call callback methods using delegates. For eg,

public delegate bool ContinueProcessing();

// later in code we can write ,

ContinueProcessing cp = new ContinueProcessing(IsDataAvailable);

cp += new ContinueProcessing(IsTransactionComplete);

//later in code defination of methods

bool IsDataAvailable() { return true; }

bool IsTransactionComplete() { return true; }

cp.Invoke() ;

The above call will call two boolean method one after the other. Why we need "Events" ? What is the purpose of "Events" ?

Answer 1

Events are callbacks where you can have multiple subscribers who don't interfere with each other and can't call each other.

Delegates provide the encapsulation of "this is the action I want to take" and events provide the encapsulation of the pub/sub model.

See my article on events for more information.