Some other class that accepts this event is called the subscriber class. Delegates and events are a fundamental concept yet complex in. A delegate declaration specifies a particular method signature. A delegate is a type that represents references to methods with a particular parameter list and return type. The events are declared and raised in a class and associated with the event handlers using delegates within the same class or some other class. Net framework event model uses delegates to bind notifications with methods known as event handlers. Delegates are especially used for implementing events and the callback methods. Delegates, events and gui lisa chair of software engineering. They are a construct for abstracting and creating objects that reference methods and can be used to call those methods. Net can be a singlecast delegate or a multicast delegate. The delegate object can then be passed to code which can call the referenced method, without having to know at compile time which method will be invoked. When an event is generated, the delegate calls the. Delegate is a class, which is used to create and invoke delegates at runtime. Lets write some code using delegates to understand delegates.
The class containing the event is used to publish the event. Now, how exactly does the compiler know how to define the invoke. A delegate is a class that encapsulates a method signature. A delegate is a typesafe object that points to another. Delegates provide a way to define and execute callbacks.
143 802 1435 842 1083 1328 579 1123 1041 1204 1128 1351 614 1378 528 747 1448 442 918 1252 1163 698 151 402 399 1033 488 440 883 1354 456 133 1298 99 422 1305 892 841 1258 809 454 789