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There are hundreds of themes available for Drupal. If you are looking for a quick and easy way to get a site up and running, you might consider browsing through the themes at www.drupal.org/project/ themes. Be sure to select 7.x in the Filter by compatibility drop-down list to show only themes that have been ported to Drupal 7.

are typed using generic type parameters). In most cases, you will not need to specify any parameters to pass to the method pointed to by Func<>. Furthermore, to greatly simplify the use of the required Func<>, I d recommend using a lambda expression (see 11 for details regarding the delegate/lambda relationship). With this in mind, here is a final version of MediaPlayer that adds a bit of custom code when the wrapped AllTracks object is created. Remember, this method must return a new instance of the type wrapped by Lazy<> before exiting, and you can use any constructor you choose (here, we are still invoking the default constructor of AllTracks): class MediaPlayer { ... // Use a lambda expression to add additional code // when the AllTracks object is made. private Lazy<AllTracks> allSongs = new Lazy<AllTracks>( () => { Console.WriteLine("Creating AllTracks object!"); return new AllTracks(); } ); public AllTracks GetAllTracks() { // Return all of the songs. return allSongs.Value; } } Sweet! Hopefully you can see the usefulness of the Lazy<> class. Essentially, this new generic class allows you to ensure expensive objects are only allocated when the object user requires them. If you find this topic useful for your projects, you may also want to look up the System.Lazy<> class in the .NET Framework 4.0 SDK documentation for further examples of how to program for "lazy instantiation".

Summary

Note You must pick a theme that has a Drupal 7 version. Drupal 6 and prior themes will not work on a Drupal 7 site due to the changes in the structure of themes in Drupal 7.

The point of this chapter was to demystify the garbage collection process. As you have seen, the garbage collector will only run when it is unable to acquire the necessary memory from the managed heap (or when a given AppDomain unloads from memory). When a collection does occur, you can rest assured that Microsoft s collection algorithm has been optimized by the use of object generations, secondary threads for the purpose of object finalization, and a managed heap dedicated to hosting large objects. This chapter also illustrated how to programmatically interact with the garbage collector using the System.GC class type. As mentioned, the only time you will really need to do so is when you are building finalizable or disposable class types that operate on unmanaged resources.

Recall that finalizable types are classes that have overridden the virtual System.Object.Finalize() method to clean up unmanaged resources at the time of garbage collection. Disposable objects, on the other hand, are classes (or structures) that implement the IDisposable interface, which should be called by the object user when it is finished using said object. Finally, you learned about an official disposal pattern that blends both approaches. We wrapped up this chapter with a look at a new .NET 4.0 generic class named Lazy<>. As you have seen, you can use this class to delay the creation of an expensive (in terms of memory consumption) object until the caller actually requires it. By doing so, you can help reduce the number of objects stored on the managed heap, and therefore ease the stress on the runtime garbage collector.

As you browse through the themes, you ll often run across themes that are described as starter themes Starter themes are focused on providing a solid foundation on which to construct a new theme Starter themes typically have a wealth of inline documentation and helpful features and functionality The benefit of a starter theme is that it provides a solid structure on which to lay graphical elements and colors, without having to start with a blank piece of paper Themes that are not classified as starter themes already have graphical effects (eg, images, colors, fonts, etc) applied and may fit your needs with very little modification For demonstration purposes, we ll install the Pixture Reloaded theme There s nothing significant about this theme other than it has been converted to work with Drupal 7 Visit the theme s page on Drupalorg (http://drupal.