Simple .NET/ASP.NET PDF document editor web control SDK

The C# compiler jumps through some significant hoops to make this work. There s no need to know the details to make use of a let clause, but if you re curious to know how it works, here s what happens. Under the covers it generates a class containing two properties called file and info, and ends up generating two queries:

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Once the module is enabled, you can navigate to Reports Available update and click the SETTINGS tab, as shown in Figure 11-2. I recommend checking for updates daily, mostly to help with planning purposes; although it s always nice to update a site immediately, sometimes it may take a day or three before there s time. I usually reserve Check for update of disabled modules and themes for testing when I m working on a site. You can also choose to receive updates when a newer version of a module is available or when the version available is a security update. I always check for all newer versions; sometimes a version update includes new features and bug fixes I might be interested in for a future site.

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

The purpose of the first query is to produce a sequence in which the range variable is wrapped in the compiler-generated type, alongside any variables declared with a let clause. (It s not actually called CompilerGeneratedType, of course the compiler generates a unique, meaningless name.) This allows all these variables to be available in all the clauses of the query.

magic string 69, 307, 309 310 magic strings 308 maintainability 56, 269 malicious 155 156, 159 map 258 260, 264 265 mapping 258 260, 262 266, 322, 328, 330, 332, 335 manual 261 262 wildcard 88 mapping files 330, 333 mappings 330, 333 334 MapRoute 7, 237, 239 241, 303, 349 Marinescu, Floyd 121 Martin, Bob 269 master pages 10, 136 138, 140, 142, 147, 151, 301, 304, 306, 313 MbUnit 59, 362 unit testing framework 285 membership 109 menu control 97 renders in Firefox and IE 98 message handler 320 321 metadata 50, 56 micromessaging 233 MIME type 229 minChars 385 mocks 62 64 model 22 32, 34, 39 44, 46 47, 49, 51, 53 56, 58, 65, 204, 209 binder 202 206, 208 210, 283 284, 373 376, 379 custom, testing 364, 373 having confidence in 376 testing 376 binding 17, 21, 28, 30, 203, 208, 213 214 state 372 templates 217 Model-View-Controller pattern 4 controller is focus 50 ModelBindingContext 205 207, 374 376 ModelMetadata 43 44, 46 48, 219 220

Before we look in detail at the services LINQ offers, there are some features that apply across all of LINQ that you should be aware of.

LINQ query syntax makes implicit use of lambdas. The expressions that appear in where, select, or most other clauses are written as ordinary expressions, but as you ve seen, the C# compiler turns queries into a series of method calls, and the expressions become lambda expressions.

Most of the time, you can just write the expressions you need and they work. But you need to be wary of code that has side effects. For example, it would be a bad idea to write the sort of query shown in Example 8-8.

ModelMetadata.DataTypeName 44 ModelMetadata.Properties 43, 47 48 ModelMetadata.TemplateHint 44 ModelMetadataProvider 215, 218 220 ModelMetadataProviders. Current 220 ModelState 55 56, 58, 372 373 ModelState.IsValid 55 56, 58 ModelType 205 207 MonoRail 145 Mozilla Firefox 113 MSBuild 80 MSDeploy 256 MSI 80 MSTest 59 .mvc extension 86 87, 92 93 MVC Futures 151 MVC pattern 4, 99 MVC website, files needed 79 MvcContrib 8, 66 69, 77, 244 247, 250, 279 280, 308, 312 313, 315 316, 320 321, 356, 362, 367 368, 372, 378 379 fluent route testing 245 makes testing routes easier 367 test helpers 369 MvcContrib.TestHelper 367, 372 MvcFutures 221 222 MvcHandler 350, 352 mvcHost 359 360 MvcRouteHandler 8, 350, 355 MvcTextTemplateHost 359 360

Figure 11-2. Navigate to Reports Available updates, and click the SETTINGS tab to configure update notifications.

int x = 10000; var bigFiles = from file in GetAllFilesInDirectory(@"c:\") where new FileInfo(file).Length > x++ select file;

This is allowed (although it s a bad idea) in LINQ to Objects. Some LINQ providers, such as the ones you would use with databases, will reject such a query at runtime.

NHibernate 106, 321 322, 324 338, 341 345 initialization 343 library, not a framework 327 needs configuration 329 Nhibernateconfiguration.xsd 330 Nhibernate-mapping.xsd 330 NHibernateModule.cs 341 NHibernateSample 329, 334 Nilsson, Jimmy 121, 332 Ninject 190 191, 196 199, 201 202 NinjectBootstrapper 198 199 NinjectMessageProvider 197 198 NLog 108 NoScript 159 NUnit 59, 252, 257, 334 335, 362 testing a route 244