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Problems occasionally arose in Windows 98 in which a diagnostic mode is needed to deal with the issue. For example, if some device driver locks up while the computer is booting up,1 the Windows 98 diagnostic mode can be used to help determine which device drivers may be causing the problem. The Windows 98 diagnostic mode does not load up all device drivers at boot time. You can access the diagnostic mode in Windows 98 by pressing the F8 key while the operating system is booting up. Even if a computer is password protected, anyone can hit the F8 key at boot time, and the computer will jump into its diagnostic mode, giving the user the ability to access the hard disk and any sensitive data on it without entering a username or password. In Windows 98, the security feature of entering a username and password was added into the operating system as an afterthought, as opposed to being part of the initial design of the operating system. If instead the operating system was designed with security in mind, then it might ask a user to enter a username and password to even enter the diagnostic mode. The design of the Windows 98 password mechanism is an example of how adding security as an afterthought does not work.

complex, monolithic chunks of code, but you can still tackle complex problems by combining smaller features. Since LINQ works by passing a sequence to a method that transforms its input into a new sequence, you can plug together as many LINQ operators as you like. The fact that these operators never modify their inputs simplifies things. If multiple pieces of code are all vying to modify some data, it can become difficult to ensure that your program behaves correctly. But with a functional style, once data is produced it never changes new calculations yield new data instead of modifying existing data. If you can be sure that some piece of data will never change, it becomes much easier to understand your code s behavior, and you ll have a better chance of making it work. This is especially important with multithreaded code.

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7 introduced the idea of lazy enumeration (or deferred execution, as it s also sometimes called). As we saw, iterating over an enumeration such as the one returned by GetAllFilesInDirectory does the necessary work one element at a time, rather than processing everything up front. The query in Example 8-2 preserves this characteristic if you run the code, you won t have to wait for GetAllFilesInDirec tory to finish before you see any results; it will start printing filenames immediately. (Well, almost immediately it depends on how far it has to look before finding a file large enough to get through the where clause.) And in general, LINQ queries will defer work as much as possible merely having executed the code that defines the query doesn t actually do anything. So in our example, this code:

var bigFiles = from file in GetAllFilesInDirectory(@"c:\") where new FileInfo(file).Length > 10000000 select file;

does nothing more than describe the query. No work is done until we start to enumerate the bigFiles result with a foreach loop. And at each iteration of that loop, it does the minimum work required to get the next item this might involve retrieving multiple results from the underlying collection, because the where clause will keep fetching items until it either runs out or finds one that matches the condition. But even so, it does no more work than necessary. The picture may change a little as you use some of the more advanced features described later in this chapter for example, you can tell a LINQ query to sort your data, in which case it will probably have to look at all the results before it can work out the correct order. (Although even that s not a given it s possible to write a source that knows all about ordering, and if you have special knowledge about your data source, it may be possible to write a source that delivers data in order while still fetching items lazily. We ll see providers that do this when we look at how to use LINQ with databases in a later chapter.)

Although deferred execution is almost always a good thing, there s one gotcha to bear in mind. Because the query doesn t run up front, it will run every time you evaluate it. LINQ doesn t keep a copy of the results when you execute the query, and there are good reasons you wouldn t want it to it could consume a lot of memory, and would prevent you from using the technique in Example 8-9. But it does mean that relatively innocuous-looking code can turn out to be quite expensive, particularly if you re using a LINQ provider for a database. Inadvertently evaluating the query multiple times could cause multiple trips to the database server.

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