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So far in this book, we ve stuck with the default routing configuration that comes with any new ASP.NET MVC project. In this chapter, we ll cover the routing system in depth and learn how to create custom routes for our applications. Routing is all about the URL and how we use it as an external input to the applications we build. The URL has led a short but troubled life, and the HTTP URL is currently being tragically misused by current web technologies. As the web began to change from being a collection of hyperlinked static documents into dynamically created pages and applications, the URL has been kidnapped by web technologies and undergone terrible changes, so that we now see file extensions like .aspx and .php mapping to physical files in public URLs. The URL is in trouble, and as the web becomes more dynamic, we, as software developers, can rescue it and bring back the simple, logical, readable, and beautiful resource locator that it was meant to be.

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Xaml is an XML-based markup language that can be used to construct a user interface Xaml is a former acronym it used to be short for eXtensible Application Markup Language, but as so often happens, for obscure marketing reasons it officially no longer stands for anything And to be fair, most acronyms are reverse-engineered the usual process is to look through the list of unused and pronounceable (it s pronounced Zammel, by the way) three- and four-letter combinations, trying to think of things that the available letters might plausibly stand for Since etymology can t tell us anything useful about what Xaml is, let s look at an example As always, following the examples yourself in Visual Studio is highly encouraged To do that, you ll need to create a new Silverlight project.

There s a separate section under Visual C# in the New Project dialog for Silverlight projects, and you should choose the Silverlight Application template (Or if you prefer, you can find the WPF Application template in the Windows section underneath Visual C#, although if you choose that, the details will look slightly different from the examples in this chapter) When you create a new Silverlight project, Visual Studio will ask you if you d like it to create a new web project to host the Silverlight application (If you add a Silverlight project to a solution that already contains a web project, it will also offer to associate the Silverlight application with that web project) Silverlight applications run from the web browser (initially, at least), so you ll need a web page simply to run your code.

It s not strictly necessary to create a whole web application, because if you choose not to, Visual Studio will just generate a web page automatically when you debug or run the project, but in general, Silverlight projects are an element of a web application, so you d normally want both kinds of projects in your solution Let it create one for now..

Rescuing the URL means changing the way we write web applications. Although routing isn t core to all implementations of the MVC pattern, it s often treated as a convenient way to add an extra level of separation between external inputs and the controllers and actions that make up an application. The code required to implement routing using the ASP.NET MVC Framework is reasonably trivial, but the thought behind designing a schema of URLs for an application can raise many issues. In this chapter, we ll go over the concept of routes and their relationships with MVC applications. We ll also briefly cover how they apply to Web Forms projects. We ll examine how to design a URL schema for an application, and then apply the concepts to create routes for a sample application. We ll look at how to test routes to ensure they re working as intended. Now that you have an idea of how important routing is, we can start with the basics.

If you were building a WPF application, you wouldn t have an associated web project, because WPF is for standalone Windows desktop applications.

This allows you to view the site as an anonymous or authenticated user and can often help when configuring modules If you can see a page, block, or feature while logged in as the superadmin but not as other users, there s a significant chance the problem lies with module permissions..