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An NAnt script is an ordinary XML document. First you declare the project, specifying the name (Hello NAnt), the default target (Build), and the working directory (dot [.] for the current directory). Next, NAnt gives you the ability to define properties. A property is a kind of named variable to which you can assign a value. The overwrite attribute lets you set the variable from the command line. The debug variable is used by the C# compiler task in a moment. The Clean target uses two delete tasks to erase unnecessary files. Setting the failonerror attribute tells NAnt to ignore possible errors for example, if there s nothing to delete. The second target, Build, first runs the Clean target because of the depends attribute, and then runs the csc target to compile the source file. One of the rules of CI that we keep mentioning is placing everything you need to fully build a project inside the project directory/repository. To use the script you just wrote, you need NAnt executables (available from http://nant.sourceforge.net). Place the NAnt executables in the tools/nant folder. NAnt is now ready to use. Open a command window, navigate to the project folder, and type tools/nant/ bin/nant.exe to launch NAnt (see figure 3.1). Run the script, and build your one-line program. Now that the script is working, you can extend it, declare more steps, and integrate more actions. At the time we started writing this book, the open source NAnt project seemed to be dead. But in mid-2010, just as we were finishing writing, a new version of NAnt emerged. We felt that delaying publication didn t merit reworking examples and text to include NAnt. From a technical point of view, it isn t a big deal. NAnt is a good

TABLE 21-1

Possibly 40%-60%

Automatic Memory Management (Garbage Collection)

Yes 45%-70%

The same as calling GC.Collect with no flag . Today, this is the same as passing Forced, but this may change in a future version of the CLR . Forces a collection to occur immediately for all generations up to and including the specified generation . The garbage collector will only perform a collection if the collection would be productive either by freeing a lot of memory or by reducing fragmentation . If the garbage collection would not be productive, then the call has no effect .

Yes 20-40%

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Under most circumstances, you should avoid calling any of the Collect methods; it s best just to let the garbage collector run on its own accord and fine-tune its generation budgets based on actual application behavior However, if you re writing a console user interface (CUI) or graphical user interface (GUI) application, your application code owns the process and the CLR in that process For these application types, you might want to suggest a garbage collection to occur at certain times using a GCCollectionMode of Optimized Normally, modes of Default and Forced are used for debugging and testing For example, you might consider calling the Collect method if some non-recurring event has just occurred that has likely caused a lot of old objects to die .

The reason that calling Collect in such a circumstance may not be so bad is that the garbage collector s predictions of the future based on the past are not likely to be accurate for non-recurring events For example, it might make sense for your application to force a full garbage collection of all generations after your application initializes or after the user saves a data file When a Windows Form control is hosted on a Web page, a full collection is performed each time a page is unloaded Don t explicitly call Collect to try to improve your application s response time; call it to reduce your process s working set The GC type also offers a WaitForPendingFinalizers method This method simply suspends the calling thread until the thread processing the freachable queue has emptied the queue, calling each object s Finalize method .

Pair programming doesn t have decades of data supporting its effectiveness like formal inspections does, but the initial data suggests it s on roughly equal footing with inspections, and anecdotal reports have also been positive. If pair programming and formal inspections produce similar results for quality, cost, and schedule, the choice between pair programming and formal inspections becomes a matter of personal style preference than of technical substance. Some people prefer to work solo, only occasionally breaking out of solo mode for inspection meetings. Others prefer to spend more of their time directly working with others. The choice between the two techniques can be driven by the workstyle preference of a team s specific developers, and subgroups within the team might even be allowed to choose which way they would like to do most of their work.

Figure 3.1 Starting a Hello World style NAnt script. The build performs a clean followed by a build task. As an artifact, you get a compiled executable.

In most applications, it s unlikely that you ll ever have to call this method Occasionally, though, I ve seen code like this:.

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GC.Collect(); GC.WaitForPendingFinalizers(); GC.Collect();

Williams, Laurie and Robert Kessler. Pair Programming Illuminated, Boston, Mass.: Addison Wesley, 2002. This book explains the detailed ins and outs of

This code forces a garbage collection . When the collection is complete, the memory for objects that don t require finalization is reclaimed . But the objects that do require finalization can t have their memory reclaimed yet . After the first call to Collect returns, the special, dedicated finalization thread is calling Finalize methods asynchronously . The call to WaitForPendingFinalizers puts the application s thread to sleep until all Finalize methods are called . When WaitForPendingFinalizers returns, all of the finalized objects are now