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using System; // Define the EventArgs-derived type for this event. public class FooEventArgs : EventArgs { } public class TypeWithLotsOfEvents { // Define a private instance field that references a collection. // The collection manages a set of Event/Delegate pairs. // NOTE: The EventSet type is not part of the FCL, it is my own type. private readonly EventSet m_eventSet = newEventSet(); // The protected property allows derived types access to the collection. protected EventSet EventSet { get { return m_eventSet; } } #region Code to support the Foo event (repeat this pattern for additional events) // Define the members necessary for the Foo event. // 2a. Construct a static, read-only object to identify this event. // Each object has its own hash code for looking up this // event's delegate linked list in the object's collection. protected static readonly EventKey s_fooEventKey = newEventKey(); // 2d. Define the event's accessor methods that add/remove the // delegate from the collection. public event EventHandler<FooEventArgs> Foo { add { m_eventSet.Add(s_fooEventKey, value); } remove { m_eventSet.Remove(s_fooEventKey, value); } }

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// 2e. Define the protected, virtual On method for this event. protected virtual void OnFoo(FooEventArgs e) { m_eventSet.Raise(s_fooEventKey, this, e); } // 2f. Define the method that translates input to this event. public void SimulateFoo() {OnFoo(newFooEventArgs());} #endregion }

Figure 24-1 Small changes tend to be more error prone than larger changes (Weinberg 1983).

Code that uses the TypeWithLotsOfEvents type can t tell whether the events have been implemented implicitly by the compiler or explicitly by the developer . They just register the events using normal syntax . Here is some code demonstrating this:

public sealed class Program { public static void Main() { TypeWithLotsOfEvents twle = newTypeWithLotsOfEvents(); // Add a callback here twle.Foo += HandleFooEvent; // Prove that it worked twle.SimulateFoo(); } private static void HandleFooEvent(object sender, FooEventArgs e) { Console.WriteLine("Handling Foo Event here..."); } }

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Programmers treat small changes casually. They don t desk-check them, they don t have others review them, and they sometimes don t even run the code to verify that the fix works properly.

The axsl parameter tells FxCopCmd to apply the XSL style sheet and produce HTML output. When that s finished, you re ready to add a new tab to the TeamCity website. Remember from earlier in the book that you have to define a new artifact FxCopReport.html and a new tab server configuration. You ll end up with this page being part of the TeamCity build report (see figure 8.8). If you re using TFS 2010 as your CI server, you re probably using the built-in codeanalysis tools. You can turn on Code Analysis even without the Visual Studio 2010 Premium Edition. It s just a matter of adding a line to the project file:

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The moral is simple. Treat simple changes as if they were complicated. One organization that introduced reviews for one-line changes found that its error rate went from 55 percent before reviews to 2 percent afterward (Freedman and Weinberg 1982).

In this chapter: Generics in the Framework Class Library Wintellect s Power Collections Library Generics Infrastructure Generic Interfaces Generic Delegates Delegate and Interface Contravariant and Covariant Generic Type Arguments Generic Methods Generics and Other Members Verifiability and Constraints 280 281 282 289 290 291 293 296 296.

Adjust your approach depending on the risk level of the refactoring Some refactorings are riskier than others. A refactoring like Replace a magic number with a named constant is relatively risk free. Refactorings that involve class or routine interface changes, database schema changes, changes to boolean tests, among others, tend to be more risky. For easier refactorings, you might streamline your refactoring process to do more than one refactoring at a time and to simply retest, without going through an official review.