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In other words, the code shown in Listing 1333 is the C# shorthand that the compiler uses to trigger the code expansion shown in Listing 1334 The C# compiler first takes the original event definition and defines a private delegate variable in its place By doing this, the delegate becomes unavailable to any external class, even to classes derived from it Next, the C# compiler defines two methods, add_OnTemperatureChange() and remove_OnTemperatureChange() , where the OnTemperatureChange suffix is taken from the original name of the event These methods are responsible for implementing the += and -= assignment operators, respectively As Listing 1334 shows, these methods are implemented using the static SystemDelegateCombine() and System DelegateRemove() methods, discussed earlier in the chapter The first parameter passed to each of these methods is the private TemperatureChangeHandler delegate instance, OnTemperatureChange Perhaps the most curious part of the code generated from the event keyword is the last part The syntax is very similar to that of a property's getter and setter methods except that the methods are add and remove The add block takes care of handling the += operator on the event by passing the call to add_OnTemperatureChange() In a similar manner, the remove block operator handles the -= operator by passing the call onto remove_OnTemperatureChange It is important to notice the similarities between this code and the code generated for a property Readers will recall that the C# implementation of a property is to create get_<propertyname> and set_<propertyname> and then to pass calls to the get and set blocks on to these methods Clearly, the event syntax is very similar Another important characteristic to note about the generated CIL code is that the CIL equivalent of the event keyword remains in the CIL In other words, an event is something that the CIL code recognizes explicitly; it is not just a C# construct By keeping an equivalent event keyword in the CIL code, all languages and editors are able to provide special functionality because they can recognize the event as a special class member.

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public string LastName { get { return _PersonLastName; } set { _PersonLastName = value; } } // }

The code for += and -= that the compiler generates can be customized Consider, for example, changing the scope of the OnTemperatureChange delegate so that it is protected rather than private This, of course, would allow classes derived from Thermostat to access the delegate directly instead of being limited to the same restrictions as external classes To enable this, C# allows the same property as the syntax shown in Listing 1332 In other words, C# allows you to define custom add and remove blocks to provide implementation for each aspect of the event encapsulation Listing 1335 provides an example

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the same members duplicated onto Contact are consistent The implementation is still not synonymous with multiple inheritance, however, because new members added to Person will not be added to Contact One possible improvement that works if the implemented members are methods (not properties) is to define interface extension methods for the additional functionality derived from the second base class An extension method on IPerson could provide a method called VerifyCredentials(), for example, and all classes that implement IPerson, even an IPerson interface that had no members but just extension methods, would have a default implementation of VerifyCredentials() What makes this a viable approach is that polymorphism is still available, as is overriding Overriding is supported because any instance implementation of a method will take priority over an extension method with the equivalent static signature

BEGINNER TOPIC Interface Diagramming Interfaces in a UML-like1 figure take two possible forms First, you can show the interface as though it is an inheritance relationship similar to a class inheritance, as demonstrated in Figure 71 between IPerson and IContact Alternatively, you can show the interface using a small circle, often referred to as a lollipop, exemplified by IPerson and IContact in Figure 71

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public class Thermostat { public class TemperatureArgs: SystemEventArgs { } // Define the delegate data type public delegate void TemperatureChangeHandler( object sender, TemperatureArgs newTemperature); // Define the event publisher public event TemperatureChangeHandler OnTemperatureChange { add { SystemDelegateCombine(value, _OnTemperatureChange); } remove { SystemDelegateRemove(_OnTemperatureChange, value); } } protected TemperatureChangeHandler _OnTemperatureChange; public float CurrentTemperature { } private float _CurrentTemperature; }

1 Unified Modeling Language (UML), a standard specification for modeling object design using graphical notation

In Figure 71, Contact derives from PdaItem and implements IContact In addition, it aggregates the Person class, which implements IPerson Although the Visual Studio 2005 Class Designer does not support this, interfaces are sometimes shown as using a derivation-type arrow to a class For example, Person could have an arrow to IPerson instead of a lollipop

In this case, the delegate that stores each subscriber, _OnTemperatureChange, was changed to protected In addition, implementation of the add block switches around the delegate storage so that the last delegate added to the chain is the first delegate to receive a notification

When creating a new version of a component or application that other developers have programmed against, you should not change interfaces Because interfaces define a contract between the implementing class and the class using the interface, changing the interface is changing the contract, which will possibly break any code written against the interface

Summary

interface IPair<T> { T First { get; set; } T Second { get; set; } }

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