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8 The ASP.NET MVC Infrastructure
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protected override IController GetControllerInstance(Type controllerType) { if (controllerType == null) return null; var controller = container.Resolve(controllerType) as Controller; if (controller == null) return controller; // Set the action invoker that fully supports localization controller.ActionInvoker = new MyActionInvoker(); return controller; } }
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With this code in the project, when the user switches to a different language, all views and controllers are aware of it because the invoker ensures that the proper culture is set on the thread. As long as you have code and resource-aware markup, it just works. Having a customer controller factory doesn t necessarily mean you have an IoC container around. If you don t have one, however, you can further improve the previous solution by resolving the action invoker type, as shown here:
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controller.ActionInvoker = container.Resolve<IActionInvoker>();
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In this case, you also need to add some configuration settings either in the web.config file or programmatically to let Unity know about the mapping between IActionInvoker and the actual type you intend to use. Here it is with the fluent API of Unity:
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container.RegisterType<IActionInvoker, MyActionInvoker>();
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The customization of the action invoker component is an important aspect of the extensibility model of ASP.NET MVC. I ll return to the topic of action invokers in 11.
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An application built with ASP.NET MVC is primarily a Web application. Modern Web applications have more numerous requirements than only a few years ago. For example, a Web application today has to be SEO-friendly and must likely support full localization to be able to drive the user s actions using the user s specific language and culture. Finally, serving a notorious yellow-screen-of-death (namely, one of those default error pages of ASP.NET) is hardly acceptable; it still happens, but it is really a bad statement about the site. (An unhandled error has always been a bad thing, but the level of default forgiveness that users were according only a few years ago today is definitely a thing of the past.)
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For all these reasons, the infrastructure of any Web applications (and, in this context, the infrastructure of ASP.NET MVC applications) need to be stronger and richer. In particular, you need to pay more attention to the URLs you recognize and design both for SEO and error handling. You need to design views and controllers to check the current locale and adjust graphics and messages automatically. You also need to detect the culture and let users switch among the languages you support. To achieve many of these goals, you need to design your site for extensibility and separation of concerns. In practical terms this means applying the principle of Dependency Inversion extensively and systematically. In summary, a realistic site can hardly do without an IoC container today. This chapter missed another key change that has characterized Web applications in the past five years AJAX. How would you do AJAX in an ASP.NET MVC application That s just what I m going to cover in the next chapter.
9
AJAX Capabilities
It matters not what someone is born, but what they grow to be. J. K. Rowling As disappointing as it might sound, the term AJAX (Asynchronous JavaScript and XML) was coined around 2005 primarily as a concise and cool way to sell a set of technologies, and a new approach to Web development, to a customer. What initially was simply a clever approach to craft nice features inside a Web page eventually became the incarnation of a new paradigm for writing a new generation of Web applications. The AJAX approach is destined to last for the foreseeable future or until conditions exist to rebuild the Web from scratch. AJAX is no longer a plus for the Web; AJAX is a native part of the Web. When you discuss use-cases and requirements with a customer, as long as a Web front end is involved, AJAX capabilities are an obvious part of the deal. I foresee in the near future a scenario where we have two approaches to Web development: an evolved ASP.NET-based platform for server-side development using a classic programming language, and an ad hoc platform for JavaScript-intensive applications. In both cases, the client has to be rich and capable of placing requests asynchronously. While waiting for such an exciting future, let s focus on what we have today for building a rich user interface for the Web. If AJAX is possible in Web Forms, it has to be possible in ASP.NET MVC too and in a similar way. All solutions for AJAX that work in an ASP.NET Web Forms application can be successfully employed in an ASP.NET MVC application. In addition, ASP.NET MVC offers a bunch of HTML helpers optimized for offering certain AJAX functions at a very low cost for the developer. Overall, the best service that ASP.NET MVC offers in an AJAX context is the total control over HTML (and subsequently, JavaScript) that it provides regardless of the view engine of choice. In this chapter, I ll first review the theme of AJAX programming in ASP.NET as a platform. Then I ll focus on the specific AJAX capabilities of the ASP.NET MVC framework.
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