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These tools do static code analysis against the code you re writing and tell you where you could do better. The testing methods we showed you in the previous two chapters are called dynamic analysis. That is, you run the code to determine its correctness. With static analysis, you don t run the code: you check it for other types of issues. Each tool checks for a different type of issue, something we ll explain as we look at each tool. Two of the tools, FxCop and StyleCop, are appropriately named because they enforce rules for good coding. They have your back when the psychopath comes lurking. In this chapter, we ll look at how to enforce obedience to good coding rules and how to define your own rules for these tools. You ll also integrate everything into your CI process. You ll do all this so you don t anger the psychopath who knows where you live. Let s get started by looking at FxCop.

Agans, David J. Debugging: The Nine Indispensable Rules for Finding Even the Most Elusive Software and Hardware Problems. Amacom, 2003. This book provides general debugging principles that can be applied in any language or environment. Myers, Glenford J. The Art of Software Testing. New York: John Wiley, 1979. 7 of this classic book is devoted to debugging. Allen, Eric. Bug Patterns In Java. Berkeley, Ca.: Apress, 2002. This book lays out an approach to debugging Java programs that is conceptually very similar to what is described in this chapter, including The Scientific Method of Debugging, distinguishing between debugging and testing, and identifying common bug patterns. The following two books are similar in that their titles suggest they are applicable only to Microsoft Windows and .NET programs, but they both contain discussions of debugging in general, use of assertions, and coding practices that help to avoid bugs in the first place.

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using System; public sealed class Point { private Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; }

Robbins, John. Debugging Applications for Microsoft .NET and Microsoft Windows. Redmond, Wa.: Microsoft Press, 2003. McKay, Everett N. and Mike Woodring, Debugging Windows Programs: Strategies, Tools, and Techniques for Visual C++ Programmers. Boston, Mass.: Addison Wesley, 2000.

public override String ToString() { return String.Format("({0}, {1})", m_x, m_y); } public static void Main() { Point p = new Point(3, 4); // The C# compiler emits the callvirt instruction here but the // JIT compiler will optimize this call and produce code that // calls ToString nonvirtually because p's type is Point, // which is a sealed class Console.WriteLine(p.ToString()); } } n

Debugging is a make-or-break aspect of software development. The best approach is to use other techniques described in this book to avoid defects in the first place. It s still worth your time to improve your debugging skills, however, because the difference between good and poor debugging performance is at least 10 to 1. A systematic approach to finding and fixing errors is critical to success. Focus your debugging so that each test moves you a step forward. Use the Scientific Method of Debugging. Understand the root problem before you fix the program. Random guesses about the sources of errors and random corrections will leave the program in worse condition than when you started. Set your compiler warning to the pickiest level possible, and fix the errors it reports. It s hard to fix subtle errors if you ignore the obvious ones. Debugging tools are powerful aids to software development. Find them and use them. Remember to use your brain at the same time.

Security and predictability A class must protect its own state and not allow itself to ever become corrupted . When a class is unsealed, a derived class can access and manipulate the base class s state if any data fields or methods that internally manipulate fields are accessible and not private . In addition, a virtual method can be overridden by a derived class, and the derived class can decide whether to call the base class s implementation . By making a method, property, or event virtual, the base class is giving up some control over its behavior and its state . Unless carefully thought out, this can cause the object to behave unpredictably, and it opens up potential security holes .

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