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Before you program anything, other than a trivial demonstration program, you need to take two steps: analysis and design. Analysis is the process of understanding and detailing the problem you are trying to solve. Design is the actual planning of your solution. With trivial problems (such as computing the Fibonacci series), you may not need an extensive analysis period, but with complex business problems the analysis process can take weeks, or even months. One powerful analysis technique is to create what are called use-case scenarios, in which you describe in some detail how the system will be used. Among the other considerations in the analysis period are determining your success factors (how do you know whether your program works ) and writing a specification of your program s requirements. Once you ve analyzed the problem, you design the solution. Imagining the classes you will use and their interrelationships is key to the design process. You might design a simple program on the fly, without this careful planning; but in any serious business application, you will want to take some time to think through the issues. There are many powerful design techniques you might use. How much time you put into design* before you begin coding will depend on the philosophy of the organization you work for; the size of your team; and your background, experience, and training.
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* See The Unified Modeling Language User Guide, Second Edition, by Grady Booch et al. (Addison-Wesley). See Agile Software Development Principles, Patterns, and Practices by Robert C. Martin (Prentice Hall).
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Jesse says: My approach to managing complexity is to keep team size very small. I have worked on large development teams, and over the years I ve come to agree with one of the best developers I ve ever met, Ed Belove, that the ideal size for a team of developers is three. Three highly skilled programmers can be incredibly productive, and with three, you don t need a manager. Three people can have only one conversation at a time. Three people can never be evenly split on a decision. One day I ll write a book on programming in teams of three, but this isn t it, so we ll stay focused on C# programming, rather than on design debates.
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Object-oriented programming helps programmers manage complexity by modeling essential aspects of the real-world problem. A class defines a new type in your program and is typically used as a representation for a type of thing in the problem domain. An object is an instance of a class. State is the current condition of an object. Many classes define member fields, which are typically private variables visible to every method of the class, but not outside the class. The behavior of the class is defined with methods, which contain code to perform an action. Methods can manipulate the state of the object and interact with other objects. The three pillars of object-oriented programming are encapsulation, specialization, and polymorphism. Encapsulation requires that each class should be discrete and self-contained. Each class should know or do one discrete thing or set of things. Specialization is implemented by deriving more specific classes from generalized (base) classes through inheritance. Polymorphism allows you to treat a collection of objects of types, all derived from a common base, as though each was an instance of that base type. Analysis is the process of detailing the problem you re trying to solve. Design is the planning of the solution to the problem. This chapter was a bit of a departure from what we ve been teaching you so far. We got away from the hands-on code to talk in broader terms about object-oriented programming and the theory behind it. That s an indication of how important these object-oriented concepts are to C# this is the only time in this book we ll devote a
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