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The C# Language
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Object-oriented programming took the best ideas of structured programming and combined them with several new concepts The result was a different and better way of organizing a program In the most general sense, a program can be organized in one of two ways: around its code (what is happening) or around its data (what is being affected) Using only structured programming techniques, programs are typically organized around code This approach can be thought of as code acting on data Object-oriented programs work the other way around They are organized around data, with the key principle being data controlling access to code In an object-oriented language, you define the data and the code that is permitted to act on that data Thus, a data type defines precisely the operations that can be applied to that data To support the principles of object-oriented programming, all OOP languages, including C#, have three traits in common: encapsulation, polymorphism, and inheritance Let s examine each
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Encapsulation
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Encapsulation is a programming mechanism that binds together code and the data it manipulates, and that keeps both safe from outside interference and misuse In an objectoriented language, code and data can be bound together in such a way that a self-contained black box is created Within the box are all necessary data and code When code and data are linked together in this fashion, an object is created In other words, an object is the device that supports encapsulation Within an object, the code, data, or both may be private to that object or public Private code or data is known to and accessible by only another part of the object That is, private code or data cannot be accessed by a piece of the program that exists outside the object When code or data is public, other parts of your program can access it even though it is defined within an object Typically, the public parts of an object are used to provide a controlled interface to the private elements C# s basic unit of encapsulation is the class A class defines the form of an object It specifies both the data and the code that will operate on that data C# uses a class specification to construct objects Objects are instances of a class Thus, a class is essentially a set of plans that specify how to build an object Collectively, the code and data that constitute a class are called its members The data defined by the class is referred to as fields The terms member variables and instance variables also are used The code that operates on that data is contained within function members, of which the most common is the method Method is C# s term for a subroutine (Other function members include properties, events, and constructors) Thus, the methods of a class contain code that acts on the fields defined by that class
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Polymorphism
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Polymorphism (from Greek, meaning many forms ) is the quality that allows one interface to access a general class of actions A simple example of polymorphism is found in the steering wheel of an automobile The steering wheel (the interface) is the same no matter what type of actual steering mechanism is used That is, the steering wheel works the same whether your car has manual steering, power steering, or rack-and-pinion steering Thus,
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2:
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An Overview of C#
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turning the steering wheel left causes the car to go left no matter what type of steering is used The benefit of the uniform interface is, of course, that once you know how to operate the steering wheel, you can drive any type of car The same principle can also apply to programming For example, consider a stack (which is a first-in, last-out list) You might have a program that requires three different types of stacks One stack is used for integer values, one for floating-point values, and one for characters In this case, the algorithm that implements each stack is the same, even though the data being stored differs In a non-object-oriented language, you would be required to create three different sets of stack routines, with each set using different names However, because of polymorphism, in C# you can create one general set of stack routines that works for all three specific situations This way, once you know how to use one stack, you can use them all More generally, the concept of polymorphism is often expressed by the phrase one interface, multiple methods This means that it is possible to design a generic interface to a group of related activities Polymorphism helps reduce complexity by allowing the same interface to be used to specify a general class of action It is the compiler s job to select the specific action (that is, method) as it applies to each situation You, the programmer, don t need to do this selection manually You need only remember and utilize the general interface
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