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Part I:

1 4

static void Main() { MyEvent evt = new MyEvent(); // Add Handler() to the event list evtSomeEvent += Handler; // Raise the event evtOnSomeEvent(); } }

This program displays the following output:

Although simple, this program contains all the elements essential to proper event handling Let s look at it carefully The program begins by declaring a delegate type for the event handler, as shown here:

delegate void MyEventHandler();

4 We do (a), (b), (c), (d) (a)

All events are activated through a delegate Thus, the event delegate type defines the return type and signature for the event In this case, there are no parameters, but event parameters are allowed Next, an event class, called MyEvent, is created Inside the class, an event called SomeEvent is declared, using this line:

public event MyEventHandler SomeEvent;

Notice the syntax The keyword event tells the compiler that an event is being declared Also declared inside MyEvent is the method OnSomeEvent( ), which is the method a program will call to raise (or fire ) an event (That is, this is the method called when the event occurs) It calls an event handler through the SomeEvent delegate, as shown here:

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if(SomeEvent != null) SomeEvent();

Notice that a handler is called if and only if SomeEvent is not null Since other parts of your program must register an interest in an event in order to receive event notifications, it is possible that OnSomeEvent( ) could be called before any event handler has been registered To prevent calling on a null reference, the event delegate must be tested to ensure that it is not null Inside EventDemo, an event handler called Handler( ) is created In this simple example, the event handler simply displays a message, but other handlers could perform more meaningful actions In Main( ), a MyEvent object is created, and Handler( ) is registered as a handler for this event, by adding it as shown here:

MyEvent evt = new MyEvent(); // Add Handler() to the event list evtSomeEvent += Handler;

15:

(b) (c)

Notice that the handler is added using the += operator Events support only += and = In this case, Handler( ) is a static method, but event handlers can also be instance methods Finally, the event is raised as shown here:

// Raise the event evtOnSomeEvent();

Calling OnSomeEvent( ) causes all registered event handlers to be called In this case, there is only one registered handler, but there could be more, as the next section explains

1 3

Like delegates, events can be multicast This enables multiple objects to respond to an event notification Here is an event multicast example:

// An event multicast demonstration using System; // Declare a delegate type for an event delegate void MyEventHandler(); // Declare a class that contains an event class MyEvent { public event MyEventHandler SomeEvent; // This is called to raise the event public void OnSomeEvent() { if(SomeEvent != null) SomeEvent(); } } class X { public void Xhandler() { ConsoleWriteLine("Event received by X object"); } } class Y { public void Yhandler() { ConsoleWriteLine("Event received by Y object"); } } class EventDemo2 { static void Handler() { ConsoleWriteLine("Event received by EventDemo"); } static void Main() { MyEvent evt = new MyEvent(); X xOb = new X(); Y yOb = new Y();