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The C# Language
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ga[0]: ga[1]: ga[2]: ga[3]: ga[4]: ga[5]: ga[6]: ga[7]: ga[8]: ga[9]: 0 1 2 15 2 25 Hello True X end
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As this program illustrates, because an object reference can hold a reference to any other type of data, it is possible to use an object reference to refer to any type of data Thus, an array of object as used by the program can store any type of data Expanding on this concept, it is easy to see how you could construct a stack class, for example, that stored object references This would enable the stack to store any type of data Although the universal-type feature of object is powerful and can be used quite effectively in some situations, it is a mistake to think that you should use object as a way around C# s otherwise strong type checking In general, when you need to store an int, use an int variable; when you need to store a string, use a string reference; and so on More importantly, since version 20, true generic types are available to the C# programmer (Generics are described in 18) The addition of generics enables you to easily define classes and algorithms that automatically work with different types of data in a type-safe manner Because of generics, you will normally not need to use object as a universal type when creating new code Today, it s best to reserve object s universal nature for specialized situations
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CHAPTER
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Interfaces, Structures, and Enumerations
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his chapter discusses one of C# s most important features: the interface An interface defines a set of methods that will be implemented by a class An interface does not, itself, implement any method Thus, an interface is a purely logical construct that describes functionality without specifying implementation Also discussed in this chapter are two more C# data types: structures and enumerations Structures are similar to classes except that they are handled as value types rather than reference types Enumerations are lists of named integer constants Structures and enumerations contribute to the richness of the C# programming environment
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Interfaces
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In object-oriented programming it is sometimes helpful to define what a class must do, but not how it will do it You have already seen an example of this: the abstract method An abstract method declares the return type and signature for a method, but provides no implementation A derived class must provide its own implementation of each abstract method defined by its base class Thus, an abstract method specifies the interface to the method, but not the implementation Although abstract classes and methods are useful, it is possible to take this concept a step further In C#, you can fully separate a class interface from its implementation by using the keyword interface Interfaces are syntactically similar to abstract classes However, in an interface, no method can include a body That is, an interface provides no implementation whatsoever It specifies what must be done, but not how Once an interface is defined, any number of classes can implement it Also, one class can implement any number of interfaces To implement an interface, a class must provide bodies (implementations) for the methods described by the interface Each class is free to determine the details of its own implementation Thus, two classes might implement the same interface in different ways, but each class still supports the same set of methods Therefore, code that has knowledge of the interface can use objects of either class since the interface to those objects is the same By providing the interface, C# allows you to fully utilize the one interface, multiple methods aspect of polymorphism
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Part I:
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The C# Language
Interfaces are declared by using the interface keyword Here is a simplified form of an interface declaration: interface name { ret-type method-name1(param-list); ret-type method-name2(param-list); // ret-type method-nameN(param-list); } The name of the interface is specified by name Methods are declared using only their return type and signature They are, essentially, abstract methods As explained, in an interface, no method can have an implementation Thus, each class that includes an interface must implement all of the methods In an interface, methods are implicitly public, and no explicit access specifier is allowed Here is an example of an interface It specifies the interface to a class that generates a series of numbers
public interface ISeries { int GetNext(); // return next number in series void Reset(); // restart void SetStart(int x); // set starting value }
The name of this interface is ISeries Although the prefix I is not necessary, many programmers prefix interfaces with I to differentiate them from classes ISeries is declared public so that it can be implemented by any class in any program In addition to methods, interfaces can specify properties, indexers, and events Events are described in 15, and we will be concerned with only methods, properties, and indexers here Interfaces cannot have data members They cannot define constructors, destructors, or operator methods Also, no member can be declared as static
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