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As a shortcut, so you don t have to build custom methods to add or remove methods to a delegate s invocation list, C# provides the event keyword. When the compiler processes the event keyword, you are automatically provided with registration and unregistration methods as well as any necessary member variables for your delegate types. These delegate member variables are always declared private, and therefore they are not directly exposed from the object firing the event. To be sure, the event keyword is little more than syntactic sugar in that it simply saves you some typing time.

You ll need to add using System;, using System.Net.Mail;, and using System.Text; too (e.g., by using the Ctrl+dot technique again). If you re prompted to choose between System.Net.Mail and System.Web.Mail, be sure to choose System.Net.Mail the other type is obsolete.

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Defining an event is a two-step process. First, you need to define a delegate type that will hold the list of methods to be called when the event is fired. Next, you declare an event (using the C# event keyword) in terms of the related delegate type. To illustrate the event keyword, create a new Console Application named CarEvents. In this iteration of the Car class, we will define two events named AboutToBlow and Exploded. These events are associated to a single delegate type named CarEngineHandler. Here are the initial updates to the Car class: public class Car { // This delegate works in conjunction with the // Car's events. public delegate void CarEngineHandler(string msg); // This car can send these events. public event CarEngineHandler Exploded; public event CarEngineHandler AboutToBlow; ... } Sending an event to the caller is as simple as specifying the event by name, along with any required parameters as defined by the associated delegate. To ensure that the caller has indeed registered with the event, you will want to check the event against a null value before invoking the delegate s method set. With these points in mind, here is the new iteration of the Car s Accelerate() method: public void Accelerate(int delta) { // If the car is dead, fire Exploded event. if (carIsDead) { if (Exploded != null) Exploded("Sorry, this car is dead..."); } else { CurrentSpeed += delta; // Almost dead if (10 == MaxSpeed - CurrentSpeed && AboutToBlow != null) { AboutToBlow("Careful buddy! Gonna blow!"); } // Still OK! if (CurrentSpeed >= MaxSpeed) carIsDead = true; else Console.WriteLine("CurrentSpeed = {0}", CurrentSpeed); } }

Figure 9-19. Constantia (serif)

With this, you have configured the car to send two custom events without having to define custom registration functions or declare delegate member variables. You will see the usage of this new automobile in just a moment, but first, let s check the event architecture in a bit more detail.

public ViewResult RsvpForm(GuestResponse guestResponse) { if (ModelState.IsValid) { guestResponse.Submit(); return View("Thanks", guestResponse); } else // Validation error, so redisplay data entry form return View(); }

A C# event actually expands into two hidden methods, one having an add_ prefix, the other having a remove_ prefix. Each prefix is followed by the name of the C# event. For example, the Exploded event results in two hidden methods named add_Exploded() and remove_Exploded(). If you were to check out the CIL instructions behind add_AboutToBlow(), you would find a call to Delegate.Combine() method. Consider the partial CIL code: .method public hidebysig specialname instance void add_AboutToBlow(class CarEvents.Car/CarEngineHandler 'value') cil managed { ... call class [mscorlib]System.Delegate [mscorlib]System.Delegate::Combine( class [mscorlib]System.Delegate, class [mscorlib]System.Delegate) ... } As you would expect, remove_AboutToBlow() will call Delegate.Remove() on your behalf: .method public hidebysig specialname instance void remove_AboutToBlow(class CarEvents.Car/CarEngineHandler 'value') cil managed synchronized { ... call class [mscorlib]System.Delegate [mscorlib]System.Delegate::Remove( class [mscorlib]System.Delegate, class [mscorlib]System.Delegate) ... } Finally, the CIL code representing the event itself makes use of the .addon and .removeon directives to map the names of the correct add_XXX() and remove_XXX() methods to invoke: .event CarEvents.Car/EngineHandler AboutToBlow { .addon void CarEvents.Car::add_AboutToBlow (class CarEvents.Car/CarEngineHandler) .removeon void CarEvents.Car::remove_AboutToBlow (class CarEvents.Car/CarEngineHandler) } Now that you understand how to build a class that can send C# events (and are aware that events are little more than a typing time-saver), the next big question is how to listen to the incoming events on the caller s side.

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