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This is an optional, although very common, LINQ query feature. It acts as a filter only items for which the expression is true will be present in the results of the query. This clause constructs a FileInfo object for the file, and then looks at its Length property so that the query only returns files that are larger than the specified size. The final part of the query describes what information we want to come out of the query, and it must be either a select or a group clause. Example 8-2 uses a select clause:

select file;

This is a trivial select clause it just selects the range variable, which contains the filename. That s why this particular query ends up producing an IEnumera ble<string>. But we can put other expressions in here for example, we could write:

select File.ReadAllLines(file).Length;

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For instance, a web server may have an option that, when turned on, allows it to serve content from a database; or when turned off, only allows it to serve files from its local file system Administrators must ensure that their web servers are configured correctly, so as to minimize the possible methods of attack By restricting a web server to only serve files from its local file system, you prevent an attacker from taking advantage of vulnerabilities in how a web server uses a back-end database It is possible for a malicious user to trick a web server into sending user-submitted data to the database as a command, and thereby take control of the database (One example of such an attack is a SQL injection attack we cover such attacks in 8.

This uses the File class (defined in System.IO) to read the file s text into an array with one element per line, and then retrieves that array s Length. This would make the query return an IEnumerable<int>, containing the number of lines in each file. You may be wondering exactly how this works. The code in a LINQ query expression looks quite different from most other C# code it is, by design, somewhat reminiscent of database queries. But it turns out that all that syntax turns into straightforward method calls.

The C# language specification defines a process by which all LINQ query expressions are converted into method invocations. Example 8-3 shows what the query expression in Example 8-2 turns into. Incidentally, C# ignores whitespace on either side of the . syntax for member access, so the fact that this example has been split across multiple lines to fit on the page doesn t stop it from compiling.

var bigFiles = GetAllFilesInDirectory(@"c:\"). Where(file => new FileInfo(file).Length > 10000000);

Let s compare this with the components of the original query:

Press Tab after selecting block, and the element code is automatically completed for you. Notice that it provides the correct opening and closing tags for the element (see Figure 9-27).

) However, even if a web server is not configured to connect to a database, other configuration options might, for instance, make available files on the local file system that a web server administrator did not intend to make accessible For instance, if a web server is configured to make all types of files stored on its file system available for download, then any sensitive spreadsheets stored on the local file system, for example, could be downloaded just as easily as web documents and images An attacker may not even need to probe web servers individually to find such documents A search engine can inadvertently crawl and index sensitive documents, and the attacker can simply enter the right keywords into the search engine to discover such sensitive documents (Long 2004)..

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

The source, which follows the in keyword in the query expression, becomes the starting point that s the enumeration returned by GetAllFilesInDirectory in this case. The next step is determined by the presence of the where clause this turns into a call to the Where method on the source enumeration. As you can see, the condition in the where clause has turned into a lambda expression, passed as an argument to the Where method. The final select clause has turned into...nothing! That s because it s a trivial select it just selects the range variable and nothing else, in which case there s no need to do any further processing of the information that comes out of the Where method. If we d had a slightly more interesting expression in the select clause, for example:

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

we would have seen a corresponding Select method in the equivalent function calls, as Example 8-4 shows.

var bigFiles = GetAllFilesInDirectory(@"c:\"). Where(file => new FileInfo(file).Length > 10000000). Select(file => "File: " + file);

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