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Save the code you start with Before you begin refactoring, make sure you can get back to the code you started with. Save a version in your revision control system, or copy the correct files to a backup directory. Keep refactorings small Some refactorings are larger than others, and exactly what constitutes one refactoring can be a little fuzzy. Keep the refactorings small so that you fully understand all the impacts of the changes you make. The detailed refactorings described in Refactoring (Fowler 1999) provide many good examples of how to do this. Do refactorings one at a time Some refactorings are more complicated than others. For all but the simplest refactorings, do the refactorings one at a time, recompile, and retest, then do the next refactoring. Make a list of steps you intend to take A natural extension of the Pseudocode Programming Process is to make a list of the refactorings that will get you from Point A to Point B. Making a list helps you keep each change in context. Make a parking lot When you re midway through one refactoring, you ll sometimes find that you need another refactoring. Midway through that refactoring, you find a third refactoring that would be beneficial. For changes that aren t needed immediately, make a parking lot a list of the changes that you d like to make at some point, but that don t need to be made right now. Make frequent checkpoints It s easy to suddenly find the code going sideways when refactoring. In addition to saving the code you started with, save checkpoints at various steps in a refactoring session so that you can get back to a working program if you code yourself into a dead end.

essentially the same thing as my EventSet class . The System.Windows.Forms.Control and System.Web.UI.Control types use the EventHandlerList type internally to maintain their sparse set of events . You re certainly welcome to use the FCL s EventHandlerList type if you d like . The difference between the EventHandlerList type and my EventSet type is that EventHandlerList uses a linked list instead of a hash table . This means that accessing elements managed by the EventHandlerList is slower than using my EventSet . In addition, the EventHandlerList doesn t offer any thread-safe way to access the events; you would have to implement your own thread-safe wrapper around the EventHandlerList collection if you need to do this .

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Now, I show a class that uses my EventSet class . This class has a field that refers to an EventSet object, and each of this class s events is explicitly implemented so that each event s add method stores the specified callback delegate in the EventSet object and each event s remove method eliminates the specified callback delegate (if found):

Use your compiler warnings It s easy to make small errors that slip past the compiler. Setting your compiler to the pickiest warning level possible will help catch many errors almost as soon as you type them. Retest Reviews of changed code should be complemented by retests. Regression testing is described in more detail in TBD, Developer Testing. Add test cases In addition to retesting with your old tests, add new unit tests to exercise the new code. Review the changes If reviews are important the first time through, they are even more important during subsequent modifications. Ed Yourdon reports that when programmers make changes to a program, they typically have more than a 50 percent chance of making an error the first time (Yourdon 1986b). Interestingly, if programmers work with a substantial portion of the code, rather than just a few lines, the chance of making a correct modification improves. Specifically, as the number of lines changed increases from one to five lines, the chance of making a bad change increases. After that, the chance of making a bad change decreases.

Integration with TeamCity requires an HTML file to merge with the TeamCity web page. FxCopCmd can produce an HTML file instead of the standard XML file. You only have to modify the call: