.NET/Java PDF, Tiff, Barcode SDK Library

HTML replacement 167, 189 Html.Action 138, 141 Html.AntiForgeryToken() 163 Html.BeginForm 16, 18 Html.CheckBoxFor 27 Html.DisplayForModel 20 Html.Encode 158 159 Html.LabelFor 27, 37 38 Html.RenderAction 104 Html.TextBoxFor 27, 37 38 HtmlHelper 35 38, 40, 43, 137 138, 141, 151, 217, 222, 243, 310, 318 319 extensions 137, 141, 151 HtmlHelperExtensions 316, 319 HTTP 203 GET 228 header 228 response 228 229 status code 242 HttpContext 54 55, 101 102, 105 107, 110 111 HttpContextBase 55, 245, 350, 352 HttpCookies 106 adding to the response 106 HttpFileCollectionValueProviderFactory 210 HttpGetAttribute 132 HttpMethod 187 188 httpModules 248 HttpPost 17, 19, 130, 178 HttpPostAttribute 132 HttpRequestBase 55, 244 245 HttpResponse 106, 241 HttpResponseBase 55, 106, 241 HttpRuntime 101 HttpSessionState 105 HttpSessionStateBase 105 HttpUnauthorizedResult 154 Hu, Ying 121

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The Where and Select methods used in Example 8-4 are extension methods. The System.Linq namespace defines a static class called Enumerable which defines these and numerous other extension methods for IEnumerable<T>. Here s the signature for one of the Where overloads:

public static IEnumerable<TSource> Where<TSource>( this IEnumerable<TSource> source, Func<TSource, bool> predicate)

IActionFilter 129, 273, 275, 377 IActionInvoker 130, 191, 202 IAuthenticationFilter 154 IAuthorizationFilter 130, 154, 377 ICache 101 103 Icarus 285 IController 9, 52, 128, 135, 192, 196, 199, 201 implemented by a controller 50

Notice that this is a generic method the method itself takes a type argument, called TSource here, and passes that through as the type argument T for the first parameter s IEnumerable<T>. The result is that this method extends IEnumerable<T>, whatever T may be. In other words, as long as the System.Linq namespace is in scope, all IEnumera ble<T> implementations appear to offer a Where method.

Select and Where are examples of LINQ operators standard methods that are available wherever LINQ is supported. The Enumerable class in System.Linq provides all the LINQ operators for IEnumerable<T>, but is not the only LINQ provider it just provides query support for collections in memory, and is sometimes referred to as LINQ to Objects. In later chapters, we ll see sources that support LINQ queries against databases and XML documents. Anyone can write a new provider, because C# neither knows nor cares what the source is or how it works it just mechanically translates query expressions into method calls, and as long as the relevant LINQ operators are available, it will use them. This leaves different data sources free to implement the various operators in whatever way they see fit. Example 8-6 shows how you could exploit this to provide custom implementations of the Select and Where operators.

In this chapter, I show how to lay a basic foundation for maintaining and updating a Drupal site. I start by discussing e-mail alerts, server logs, and site reports everything you need to ensure your Drupal site is updated and haxxor free. I then delve into the science of updating your site and how Drupal is becoming extremely easy to update compared to previous versions. I close with a number of modules to help with managing multiple Drupal sites.

public class Foo { public string Name { get; set; } public Foo Where(Func<Foo, bool> predicate) { return this; } public TResult Select<TResult>(Func<Foo, TResult> selector) { return selector(this); }

391 JSON 86, 152 153, 163 167, 172, 179, 181 185, 189, 222 better solution 172 consuming an action from the view 184 hijacking 152 153, 163 166 Json() 183 JsonRequestBehavior 165 JsonRequestBehavior.AllowGet 183 JsonResult 164 166, 183

}

These are normal methods rather than extension methods we re writing a custom type, so we can add LINQ operators directly to that type. Since C# just converts LINQ queries into method calls, it doesn t matter whether LINQ operators are normal methods or extension methods. So with these methods in place, we could write the code shown in Example 8-7.

IControllerFactory 192, 196 identifier, unique 230, 234 IEnumerable 67 IExceptionFilter 377 IFilteredModelBinder 204 206 IgnoreRoute 7, 236 237 IHttpHandler 71 72, 84, 171, 349 IHttpModule 70 72, 84, 91 92 IIRF.dll 92 IIS 78 80, 82 89, 91 93, 253 254 mapping new extension 86 IIS 6.0 configuring routes for 88 deploying to 84 URL rewriting 91 using a custom extension 86 with .aspx extension 85 IIS 7.0 79 application pool configuration 82 deploying to 80 URL generation in 83 IIS6 83 IIS7 72 image files 313 IMessageProvider 194 199, 201 202 IModelBinder 374 imperative programming 262 Index 53 54, 56 Infrastructure project 325, 328, 330, 337, 341, 343 344 inheritance 272 input 25 30 data 54 element 37 40, 43 validation 159 InputBuilder.BootStrap 315 316 inputClass 384 InsertionMode 187 188 instant messenger 233 Integrated mode 82 integration machine 252 integration, continuous 252 IntelliSense 24, 330 Internet Explorer 98, 229, 242 HTTP error messages 242 Internet Information Services. See IIS Inversion of Control. See IoC IoC 191, 274, 325 containers 191, 194, 325

Foo source = new Foo { Name = "Fred" }; var result = from f in source where f.Name == "Fred" select f.Name;