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If we re using the version of AddNumbers from Example 7-32 the one that uses yield return this will start printing out filenames (with added numbers) immediately. However, if you try it with the version from Example 7-31, you ll see something quite different. The program will sit there for as many minutes as it takes to find all the filenames on the hard disk it might print out some messages to indicate that you don t have permission to access certain folders, but it won t print out any filenames until it has all of them. And it ends up consuming quite a lot of memory on my system it uses more than 130 MB of memory, as it builds up a huge List<string> containing all of the filenames, whereas the lazy version makes do with a rather more frugal 7 MB. So in its eagerness to do all of the necessary work up front, Example 7-31 actually slowed us down. It didn t return any information until it had collected all of the information. Ironically, the lazy version in Example 7-32 enabled us to get to work much faster, and to work more efficiently.

The Main Server Section: This provides directives that are specific to Apache s main server process. This process creates and controls the subprocesses that communicate with the server s clients. In this section you can change the main server s name to match the one assigned by your DNS server, so that web clients can find your web server by using its hostname, or you can add more directories for web pages. If additional server-scripting language modules have been loaded, you can specify their file extensions so that Apache can interpret them properly. The Virtual Hosts Section: The options available in this section enable you to maintain multiple domains on your machine. This can be useful if you are in the web hosting business or if your company has subsidiaries that need web presence using your server. The configuration file s division into these parts is actually not required. The maintainers of Apache adopted this convention to help beginning web administrators understand how the configuration file works. When you gain more experience, you can create your own configuration file to use instead of this one. Because you are learning to use Apache, it is best to use the existing httpd.conf file at the moment. Be sure to make a backup, because in later sections you will make a lot of changes to observe how Apache reacts to them.

This style of enumeration, in which work is done no sooner than necessary, is sometimes called deferred execution. While that s more of a mouthful, it s probably more fitting in cases where the effect is the opposite of what lazy suggests.

Lazy enumeration also permits an interesting technique whereby infinite loops aren t necessarily a problem. A method can yield an infinite collection, leaving it up to the caller to decide when to stop. Example 7-36 returns an enumeration of numbers in the Fibonacci series. That s an infinite series, and since this example uses the BigInteger type introduced in .NET 4, the quantity of numbers it can return is limited only by space and time the amount of memory in the computer, and the impending heat death of the universe, respectively (or your computer s next reboot, whichever comes sooner).

using System.Numerics; // Required for BigInteger ... static IEnumerable<BigInteger> Fibonacci() { BigInteger current = 1; BigInteger previous = 1; yield return 1; while (true) { yield return current; BigInteger next = current + previous; previous = current; current = next; } }

Do not forget to specify the full path of the key for the HostKey to locate the new private key file. Making a new set of keys on a fixed interval will increase your SSH server s security and is important if the current private key is stolen.

Because consumers of enumerations are free to stop enumerating at any time, in practice this sort of enumeration will just keep going until the calling code decides to stop. We ll see some slightly more practical uses for this when we explore parallel execution and multithreading later in the book. The concept of chaining lazy enumerations together shown in Example 7-35 is a very useful technique it s the basis of the most powerful feature that was added in version 3 of C#: LINQ. LINQ is such an important topic that the next chapter is devoted to it. But before we move on, let s review what we ve seen so far.

Summary