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This will have the potentially surprising result that the query could return different files every time it runs, even if the underlying data has not changed. Remember, the expression in the where clause gets converted into an anonymous method, which will be invoked once for every item in the query s source. The first time this runs, the local x variable will be incremented once for every file on the disk. If the query is executed again, that ll happen again nothing will reset x to its original state. Moreover, queries are often executed sometime after the point at which they are created, which can make code with side effects very hard to follow looking at the code in Example 8-8 it s not possible to say exactly when x will be modified. We d need more context to know that when exactly is the bigFiles query evaluated How many times In practice, it is important to avoid side effects in queries. This extends beyond simple things such as the ++ operator you also need to be careful about invoking methods from within a query expression. You ll want to avoid methods that change the state of your application. It s usually OK for expressions in a query to read variables from the surrounding scope, though. A small modification to Example 8-8 illustrates one way you could exploit this (see Example 8-9).

int minSize = 10000; var bigFiles = from file in GetAllFilesInDirectory(@"c:\") where new FileInfo(file).Length > minSize select file; var filesOver10k = bigFiles.ToArray(); minSize = 100000; var filesOver100k = bigFiles.ToArray(); minSize = 1000000;

var filesOver1MB = bigFiles.ToArray(); minSize = 10000000; var filesOver10MB = bigFiles.ToArray();

At the highest level, designing security into a software application means that one should keep security in mind while building it, starting with its requirements and design. It is not advisable to write your code first, and then worry about making it secure afterward. Experience has shown that it is very hard to add on security later. The following subsections provide two common examples that illustrate the importance of designing-in security from the start. We then discuss problems inherent in trying to protect such vulnerable systems by creating yet more systems to act as gatekeepers.

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This query makes use of a local variable as before, but this query simply reads the value rather than modifying it. By changing the value of that variable, we can modify how the query behaves the next time it is evaluated. (The call to ToArray() executes the query and puts the results into an array. This is one way of forcing an immediate execution of the query.)

LINQ operators all share a common characteristic: they do not modify the data they work on. For example, you can get LINQ to sort the results of a query, but unlike Array.Sort or List<T>.Sort, which both modify the order of an existing collection, sorting in LINQ works by producing a new IEnumerable<T> which returns objects in the specified order. The original collection is not modified. This is similar in style to .NET s string type. The string class provides various methods that look like they will modify the string, such as Trim, ToUpper, and Replace. But strings are immutable, so all of these methods work by building a new string you get a modified copy, leaving the original intact. LINQ never tries to modify sources, so it s able to work with immutable sources. LINQ to Objects relies on IEnumerable<T>, which does not provide any mechanism for modifying the contents or order of the underlying collection.

Listing 9-3. Technorati Block Definition XML File < xml version="1.0" encoding="utf-8" > <block class="TechnoratiClass"> <providerName>Technorati</providerName> <providerUrl>http://www.technorati.com/</providerUrl> <providerLogoUrl>/content/components/icons/block.png</providerLogoUrl> <blockIconUrl>/content/components/icons/block.png</blockIconUrl> <keys> <description/> <signUpUrl>http://technorati.com/developers/apikey.html</signUpUrl> <key id="key" whenRequired="save"> <name>API Key</name> <notes/> </key> </keys> <operations> <operation name="getSearchResults" callMode="auto"> <description>Blog posts featuring a given keyword or phrase(Items Only) Returned in RSS format.</description> <inputs> <input name="query" required="true" type="string"> <description>Set this to the words you are searching for.</description> <defaultValue>Popfly</defaultValue> <constraints/> </input> </inputs> <outputs> <output isArray="true" type="custom" object="RSSItem"/> </outputs> </operation> </operations> <objects> <object name="RSSItem"> <field name="title" type="title" isArray="false"/> <field name="link" type="url" isArray="false"/> <field name="description" type="description" isArray="false"/> <field name="source" type="string" isArray="false"/> <field name="sourceLink" type="url" isArray="false"/> <field name="author" type="name" isArray="false"/> <field name="tags" type="string" isArray="false"/> <field name="comments" type="string" isArray="false"/>

Of course, LINQ does not require sources to be immutable. IEnumera ble<T> can be implemented by modifiable and immutable classes alike. The point is that LINQ will never attempt to modify its source collections.

This approach is sometimes described as a functional style. Functional programming languages such as F# tend to have this characteristic just as mathematical functions such as addition, multiplication, and trigonometric functions do not modify their inputs, neither does purely functional code. Instead, it generates new information based on its inputs new enumerations layered on top of input enumerations in the case of LINQ. C# is not a purely functional language it s possible and indeed common to write code that modifies things but that doesn t stop you from using a functional style, as LINQ shows. Functional code is often highly composable it tends to lead to APIs whose features can easily be combined in all sorts of different ways. This in turn can lead to more maintainable code small, simple features are easier to design, develop, and test than

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