The Controller Class in VB.NET

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The Controller Class
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The Controller class inherits from ControllerBase and adds a bunch of new methods and properties. All public and protected members of this class should interest you because your application s controllers ultimately inherit from Controller. In addition, the Controller class provides an override for the sole method on ControllerBase that remained abstract ExecuteCore. Here s the signature of the Controller class:
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public abstract class Controller : ControllerBase, IActionFilter, IAuthorizationFilter, IDisposable, IExceptionFilter, IResultFilter { ... }
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We ll take a look at implemented interfaces in the next section. Table 4-2, instead, describes the behavior of prominent Controller methods. All methods in the table are protected, and most of them are internal. Only a few are virtual and can be overridden in your controller classes.
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Part II The Core of ASP.NET MVC
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TABLE 4-2
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Methods of the Controller class
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Internal and overloaded method. It gets some raw data (primitive data, custom objects) and returns a ContentResult object to render it to the browser. Virtual method. It creates an action invoker to be used to govern the execution of action requests. Virtual method. It creates the actual container for data accessible through the TempData dictionary. By default, the temp data provider is an instance of the SessionStateTempDataProvider class. Virtual method. It performs application-specific tasks associated with freeing, releasing, or resetting unmanaged resources used by the controller. Takes care of executing the action method as specified in the route data associated with the current request. Internal and overloaded method. It returns a FileResult object used to render the content of a file. Content to render can be expressed in a variety of formats: file name, byte array, or stream. Virtual method. It is called whenever a request matches the controller, but not an action method of the controller. The default implementation just throws an exception. Performs another step of initialization on the controller class. It first calls the base Initialize method (described earlier) and then instantiates a helper object for URL manipulation. Internal and overloaded method. It returns a JavaScriptResult object that encapsulates a piece of script code to be written to the response stream. Internal and overloaded method. It returns a JsonResult object that encapsulates a JSON string resulting from the serialization of a given object. Internal and overloaded method. It gets a view name and returns a PartialViewResult object that renders a partial (that is, incomplete) view to the response stream. A partial view is much like a user control in Web Forms. Virtual method. It returns a RedirectResult object that contains information about the URL to redirect to. Internal and overloaded method. It gets the controller name, action name, and route values. The method returns a RedirectToRouteResult object to redirect to the URL identified by the specified controller, action, and route parameters. Internal and overloaded method. It gets route name and route values. The method returns a RedirectToRouteResult object to redirect to the URL identified by the specified route and related parameters.
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Method
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Content
CreateActionInvoker CreateTempDataProvider
Dispose
ExecuteCore File
HandleUnknownAction
Initialize
JavaScript
Json
PartialView
Redirect RedirectToAction
RedirectToRoute
4 Inside Controllers
Method
TryUpdateModel
Description
Internal and overloaded method. It updates the specified model instance using values currently stored in the parameters dictionary exposed via the ValueProvider property. The method returns a Boolean value to indicate success or failure of the update. Internal and overloaded method. It works like TryUpdateModel except that it throws an exception if the update fails. Internal and overloaded method. It returns a ViewResult object that renders a view (that is, a new page) to the response stream.
UpdateModel View
I ll cover the return values of controller methods later in the chapter. I ll take care of model updates in great detail in 6. Views, on the other hand, will be the main topic of 5, Inside Views. Before we go any further, it s worth spending a few more words to explain the differences between three apparently similar methods: Redirect, RedirectToAction, and RedirectToRoute. All three methods actually move the control to another view. In raw MVC terms, we would say that all redirect methods move to another MVC triad. The way in which you specify the next triad is different for each considered method. The Redirect method is the simplest it just redirects to the view represented by the specified URL. The RedirectToAction method, on the other hand, requires that you indicate the next view through the action (and, optionally, the controller and parameters) that renders it. You can also use RedirectToAction to switch from one controller to another. The method RedirectToAction assumes that you intend to redirect to the same route, perhaps changing the controller, action, and parameters. The RedirectToRoute method works in much the same way as RedirectToAction, but it offers a bit more flexibility. RedirectToRoute explicitly requires that you specify the route name and, optionally, all of its parameters. In doing so, you can switch from one route to another. In light of their similarity, it s not coincidental that RedirectToAction and RedirectToRoute return an object of the same type RedirectToRouteResult. In spite of the surface difference, essentially all redirect methods work the same way they collect parameters, build a URL, and then invoke the method Redirect on the HttpResponse object. Tip If no method match is found, an override of HandleUnknownAction gives you the last chance to decide what to do. At a minimum, you can also use an override of HandleUnknownAction as a custom exception handler for unknown actions.
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