ASP.NET PDF Viewer using C#, VB/NET

C# will follow the rules for translating query expressions into method calls, just as it would for any query, so it will turn Example 8-7 into this:

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In my humble opinion, one of the most important aspects of maintaining a production site is ensuring it s up-to-date and haxxor-proof. Provided a site is well-built, the only real tasks you ll be responsible for are checking server logs, creating site reports, and updating Drupal core or contributed modules. Make sure the Update Manager is enabled! The Update Manager sends you e-mails whenever there s an update available on a site you ve built. It s normally enabled when a site is installed using the standard install profile (see 2), but simply navigate to Reports Status report and check the status of Update notifications to ensure it s enabled; Drupal will give a warning if it isn t, as shown in Figure 11-1. To enable it, navigate to the Modules section, scroll to Update Manager, select the enable check box, and save.

Foo source = new Foo { Name = "Fred" }; var result = source.Where(f => f.Name == "Fred").Select(f => f.Name);

framework 199, 202 tools provide factories automatically 343 Ionic 91 IOrderRepository 124 125 IPrincipal 154 IRepository 206 208 IResultFilter 377 IRouteConstraint 240 IRouteHandler 8, 349 350, 352, 355 ISAPI 84 86, 88, 91 93 developing custom filters requires C/C++ 84 filters 84 handlers 84 ISAPI Rewrite 91 93 IsapiRewrite4.dll 92 IsMatch 204 206 IsValid 56, 217 218 It works on my machine 252 IUserSession 377 379 IValueProvider 209 212 IView 32 IViewEngine 32 IVisitorRepository 326 328, 333, 339 341, 343 IWindsorContainer 200 201

Since the Foo class provides the Where and Select operators that C# expects, this will compile and run. It won t be particularly useful, because our Where implementation completely ignores the predicate. And it s also a slightly bizarre thing to do our Foo class doesn t appear to represent any kind of collection, so it s rather misleading to use syntax that s intended to be used with collections. In fact, Example 8-7 has the same effect as:

var result = source.Name;

LabelFor 39 lambda expression 27 28, 68, 245 aid in refactoring 28 large applications 301 large files 69 71, 77 late binding 69 launch 251 Law of Demeter 171 layer supertype 272 273 layouts 137, 139, 147, 149 level, value indicates difficulty of session 122 Lightweight Test Automation Framework 284 lineSeparator 385 links 136, 138, 148, 301, 305 307, 310 LINQ 53 LINQ to SQL 125 ListBoxFor 39 loadingClass 385 LoadingElementId 187 local build 252 Local Data Mode 382 localization 95, 109 110, 114 adding an additional culture 112 adding global resources 111 configuring Firefox to prefer a different language 113 enabling autoculture selection from the browser 113 getting localized strings 111

So you d never write code like Example 8-6 and Example 8-7 for a type as simple as Foo in practice the purpose of these examples is to illustrate that the C# compiler blindly translates query expressions into method calls, and has no understanding or expectation of what those calls might do. The real functionality of LINQ lives entirely in the class library. Query expressions are just a convenient syntax.

Figure 11-1. Navigate to Reports Status report, and check the status of Update notifications to ensure you receive e-mails when a module has an available update.

Query expressions can contain let clauses. This is an interesting kind of clause in that unlike most of the rest of a query, it doesn t correspond directly to any particular LINQ operator. It s just a way of making it easier to structure your query. You would use a let clause when you need to use the same information in more than one place in a query. For example, suppose we want to modify the query in Example 8-2 to return a FileInfo object, rather than a filename. We could do this:

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

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But this code repeats itself it creates a FileInfo object in the where clause and then creates another one in the select clause. We can avoid this repetition with a let clause:

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

392 log4net 108 Log4Net.config 330, 333 logging 285 logging in 312, 320