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11 Customizing ASP.NET MVC
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TABLE 11-1
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Types of action filters in ASP.NET MVC
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Defines two methods that execute before and after the controller action Defines a method that executes early in the action pipeline, giving you a chance to verify whether the user is authorized to perform the action Defines a method that runs whenever an exception is thrown during the execution of the controller action Defines two methods that execute before and after the processing of the action result
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Filter Interfaces
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IActionFilter IAuthorizationFilter IExceptionFilter IResultFilter
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When it comes to writing an action filter, you typically inherit from FilterAttribute and then implement one or more of the interfaces defined in Table 11-1. The FilterAttribute class is an abstract class that defines only one property, as shown here:
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public abstract class FilterAttribute : Attribute { // Fields private int _order; // Methods protected FilterAttribute(); // Properties public int Order { get; set; } }
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The Order property refers to the order in which the filter will be executed. No order is defined by default on action filters. Unless explicitly set, the Order property is assumed to be 1, which means the filter will be run in no particular order. Note that if you explicitly set the same order on two or more action filters on a method, an exception will be thrown. The ActionFilterAttribute class is another, richer, base class for creating your custom action filters. It inherits from FilterAttribute and provides a default implementation for all the interfaces listed in Table 11-1. Let s take a closer look at some sample action filters.
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Browser-Specific Views
Offering the same view and user experience across different browsers is an old problem of Web developers. ASP.NET Web Forms supports browser-specific master pages and also allows you to assign browser-specific values to control properties. By creating an HTTP module, you can also redirect the original request made to a given URL to another URL that offers the same content but that is optimized for the current browser.
Part III Programming Features
In ASP.NET MVC, a similar solution is perhaps too much of a hack, because a simpler and neater approach exists that is based on action filters. The idea is to write a custom action filter that kicks in just before the action invoker begins processing the action result. According to the classification introduced earlier in the chapter, this technically is a result filter. Let s have a look at the source code:
public class BrowserSpecificAttribute : ActionFilterAttribute { public override void OnResultExecuting(ResultExecutingContext filterContext) { ... } }
The filter inherits from ActionFilterAttribute and overrides the method OnResultExecuting. The method is invoked after the execution of the action method but before the result of the action is processed to generate the response for the browser:
public override void OnResultExecuting(ResultExecutingContext filterContext) { // Get the action result based on which the view will be generated var viewResult = filterContext.Result as ViewResult; if (viewResult == null) return; // You never reach this point if the method returned anything different // from ViewResult such as JsonResult or FileResult. // Get the name of the view as requested by the action method string viewName = viewResult.ViewName; // Retrieve the name of the browser that placed the request var controllerContext = filterContext.Controller.ControllerContext; string browserName = controllerContext.HttpContext.Request.Browser.Browser; // Based on the browser name, sets the name of the new view to use. string newViewName = GetViewNameForBrowser(viewName, browserName); // Check whether the current view engine supports such a view ViewEngineResult result = ViewEngines.Engines.FindView( controllerContext, newViewName, viewResult.MasterName); // If the view is supported, then set it as the view to use for rendering if (result.View != null) viewResult.ViewName = newViewName; }
The algorithm employed is simple. Using the ControllerContext object, the filter retrieves the Request object from the request context; from there, it gets to know the capabilities of the
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