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With this, we would now update the CarEventHandler delegate as follows (the events would be unchanged): public class Car { public delegate void CarEventHandler(object sender, CarEventArgs e); ... } When firing our events from within the Accelerate() method, we would now need to supply a reference to the current Car (via the this keyword) and an instance of our CarEventArgs type: public void Accelerate(int delta) { // If the car is dead, fire Exploded event. if (carIsDead) { if (Exploded != null) Exploded(this, new CarEventArgs("Sorry, this car is dead...")); } else { ... AboutToBlow(this, new CarEventArgs("Careful buddy! Gonna blow!")); } ... } On the caller s side, all we would need to do is update our event handlers to receive the incoming parameters and obtain the message via our read-only field. For example: public static void CarAboutToBlow(object sender, CarEventArgs e) { Console.WriteLine("{0} says: {1}", sender, e.msg); } If the receiver wishes to interact with the object that sent the event, we can explicitly cast the System.Object. Thus, if we wish to power down the radio when the Car object is about to meet its maker, we could author an event handler looking something like the following: public { // // if { static void CarIsAlmostDoomed(object sender, CarEventArgs e) Just to be safe, perform a runtime check before casting. (sender is Car) Car c = (Car)sender; c.CrankTunes(false); } Console.WriteLine("Critical Message from {0}: {1}", sender, e.msg); }

Using these two pseudo-classes, you can easily change the display of an element only when these states are activated For example: a:hover { color: red; } tr:hover { background-color: #dfdfdf ; } input:focus { background-color: #dfdfdf ; }.

To wrap up this chapter, let s examine some final delegate-and-event-centric features of .NET 2.0 as seen through the eyes of C#. To begin, consider the fact that when a caller wishes to listen to incoming events, it must define a unique method that matches the signature of the associated delegate:

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class SomeCaller { static void Main(string[] args) { SomeType t = new SomeType(); t.SomeEvent += new SomeDelegate(MyEventHandler); } // Typically only called by the SomeDelegate object. public static void MyEventHandler() { ...} } When you think about it, however, methods such as MyEventHandler() are seldom intended to be called by any part of the program other than the invoking delegate. As far as productivity is concerned, it is a bit of a bother (though in no way a showstopper) to manually define a separate method to be called by the delegate object. To address this point, it is now possible to associate a delegate directly to a block of code statements at the time of event registration. Formally, such code is termed an anonymous method. To illustrate the basic syntax, check out the following Main() method, which handles the events sent from the Car type using anonymous methods, rather than specifically named event handlers: class Program { static void Main(string[] args) { Console.WriteLine("***** Anonymous Methods *****\n"); Car c1 = new Car("SlugBug", 100, 10); // Register event handlers as anonymous methods. c1.AboutToBlow += delegate { Console.WriteLine("Eek! Going too fast!"); }; c1.AboutToBlow += delegate(object sender, CarEventArgs e) { Console.WriteLine("Message from Car: {0}", e.msg); }; c1.Exploded += delegate(object sender, CarEventArgs e) { Console.WriteLine("Fatal Message from Car: {0}", e.msg); }; ... } }

The final curly bracket of an anonymous method must be terminated by a semicolon. If you fail to do so, you are issued a compilation error.

Note Microsoft Internet Explorer 6 and below supports pseudo-classes only on links (anchor elements

Page2 in Design view should look similar to Figure 4-24.

Again, notice that the Program type no longer defines specific static event handlers such as CarAboutToBlow() or CarExploded(). Rather, the unnamed (aka anonymous) methods are defined inline at the time the caller is handling the event using the += syntax. The basic syntax of an anonymous method matches the following pseudo-code:

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