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C# allows you to write any type of event you desire However, for component compatibility with the NET Framework, you will need to follow the guidelines Microsoft has established for this purpose At the core of these guidelines is the requirement that event handlers have two parameters The first is a reference to the object that generated the event The second is a parameter of type EventArgs that contains any other information required by the handler Thus, NET-compatible event handlers will have this general form: void handler(object sender, EventArgs e) { // } Typically, the sender parameter is passed this by the calling code The EventArgs parameter contains additional information and can be ignored if it is not needed The EventArgs class itself does not contain fields that you use to pass additional data to a handler Instead, EventArgs is used as a base class from which you will derive a class that contains the necessary fields EventArgs does include one static field called Empty, which is an EventArgs object that contains no data Here is an example that creates a NET-compatible event:

// A NET-compatible event using System; // Derive a class from EventArgs class MyEventArgs : EventArgs { public int EventNum;

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} // Declare a delegate type for an event delegate void MyEventHandler(object sender, MyEventArgs e); // Declare a class that contains an event class MyEvent { static int count = 0; public event MyEventHandler SomeEvent; // This raises SomeEvent public void OnSomeEvent() { MyEventArgs arg = new MyEventArgs(); if(SomeEvent != null) { argEventNum = count++; SomeEvent(this, arg); } } } class X { public void Handler(object sender, MyEventArgs e) { ConsoleWriteLine("Event " + eEventNum + " received by an X object"); ConsoleWriteLine("Source is " + sender); ConsoleWriteLine(); } } class Y { public void Handler(object sender, MyEventArgs e) { ConsoleWriteLine("Event " + eEventNum + " received by a Y object"); ConsoleWriteLine("Source is " + sender); ConsoleWriteLine(); } } class EventDemo6 { static void Main() { X ob1 = new X(); Y ob2 = new Y(); MyEvent evt = new MyEvent(); // Add Handler() to the event list evtSomeEvent += ob1Handler; evtSomeEvent += ob2Handler; // Raise the event evtOnSomeEvent(); evtOnSomeEvent(); } }

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Part I:

Here is the output:

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Event 0 received by an X object Source is MyEvent Event 0 received by a Y object Source is MyEvent Event 1 received by an X object Source is MyEvent Event 1 received by a Y object Source is MyEvent

In this example, MyEventArgs is derived from EventArgs MyEventArgs adds just one field of its own: EventNum The event handler delegate MyEventHandler now takes the two parameters required by the NET Framework As explained, the first is an object reference to the generator of the event The second is a reference to EventArgs or a class derived from EventArgs The event handler in the X and Y classes, Handler( ), also has the same types of parameters Inside MyEvent, a MyEventHandler called SomeEvent is declared In the OnSomeEvent( ) method, SomeEvent is called with the first argument being this, and the second argument being a MyEventArgs instance Thus, the proper arguments are passed to MyEventHandler to fulfill the requirements for NET compatibility

The previous program declared its own event delegate However, there is no need to do this because the NET Framework provides a built-in generic delegate called EventHandler<TEventArgs> (See 18 for a discussion of generic types) Here, the type of TEventArgs specifies the type of the argument passed to the EventArgs parameter of the event For example, in the preceding program, SomeEvent in MyEvent could have been declared like this:

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public event EventHandler<MyEventArgs> SomeEvent;

In general, it is better to use this approach rather than defining your own delegate For many events, the EventArgs parameter is unused To help facilitate the creation of code in these situations, the NET Framework includes a non-generic delegate called EventHandler, which can be used to declare event handlers in which no extra information is needed Here is an example that uses EventHandler:

// Use the built-in EventHandler delegate using System; // Declare a class that contains an event class MyEvent { public event EventHandler SomeEvent; // uses EventHandler delegate // This is called to raise SomeEvent public void OnSomeEvent() {