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4 Inside Controllers
Note that FileContentResult, FilePathResult, and FileStreamResult derive from the same base class, FileResult. You use any of these action result objects if you want to reply to a request with the download of some file content or even some plain binary content expressed as a byte array. PartialViewResult and ViewResult inherit from ViewResultBase and return HTML content. ViewResult is by far the most frequently used action result object in an ASP.NET MVC application. A view result object is also significantly more complex than any other action result. A view result object, in fact, deals with the currently registered view engine a replaceable component and accesses the view-model. As we ll see in more detail in 5, a view engine gets an input template and the view-model and produces HTML. The input template, however, doesn t have to be an ASPX file. Whether it is ASPX markup, XAML, or plain XML depends exclusively on the capabilities of the selected view engine. Note What if your controller action method doesn t return ActionResult First and foremost, no exceptions are raised. Quite simply, ASP.NET MVC encapsulates any return value from the action method (numbers, strings, or custom objects) into a ContentResult object. The execution of a ContentResult object causes the plain serialization of the value to the browser. For example, an action that returns an integer or a string will get you a browser page that displays data as is. On the other hand, returning a custom object displays any string resulting from the implementation of the object s ToString method. If the method returns an HTML string, any markup will not be automatically encoded and the browser will likely not properly parse it. Finally, a void return value is actually mapped to an EmptyResult object whose execution just causes a no-op. More often than not, an action method doesn t directly create and return an ActionResult object. As shown in Table 4-2, the base Controller class features a bunch of helper methods that you internally create and that return an appropriate ActionResult object. The most popular of these helper methods is View. Here s the list of overloads for the method:
ViewResult View(); ViewResult View(object model); ViewResult View(string viewName); ViewResult View(IView view); ViewResult View(string viewName, object model); ViewResult View(string viewName, string masterName); virtual ViewResult View(IView view, object model); virtual ViewResult View(string viewName, string masterName, object model);
The method can accept the view name, the master page name, and the view-model. All parameters are optional and, if not specified, are resolved in some way internally. In some cases, the View method might also accept an IView object that points it directly to an internal object ready for rendering. (I ll say more about the rendering mechanism in 5.)
Part II The Core of ASP.NET MVC
Attributes of Controllers and Action Methods
In .NET, attributes are a declarative way of attaching some specific behavior to a class or a method. The behavior of both the controller class and its methods can be further specialized using a number of attributes. There are three categories of attributes that affect a controller class and its methods: filters, invocation attributes, and action selectors.
Filter Attributes
A filter is a piece of code that can be attached to a few predefined stages during the execution of an action method. Table 4-7 lists the built-in filters available in ASP.NET MVC.
TABLE 4-7
Predefined filters in ASP.NET MVC
Description
Marks an action method as one that will execute asynchronously and terminate in the specified number of seconds. A companion attribute also exists for asynchronous methods that do not set a timeout. This companion attribute is NoAsyncTimeout. This is available only in ASP.NET MVC 2. Marks an action method as one that can be accessed only by specified users, roles, or both. Marks an action method as one that can be executed only as a child action during a render-action operation. This is available only in ASP.NET MVC 2. Marks an action method as one that requires automatic handling of any exceptions thrown during its execution. Marks an action method as one whose output needs to be cached. Marks an action method as one that requires a secure request. If the method is invoked over HTTP, the attribute forces a redirect to the same URL but over a HTTPS connection, if that s ever possible. This is available only in ASP.NET MVC 2. Marks an action method as one that requires validation against the antiforgery token in the page for each POST request. Marks an action method as one whose posted input data might (or might not) need validation.
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