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A multitude of rulers is not a good thing. Let there be one ruler, one king. Homer ASP.NET MVC works and thrives on top of the classic ASP.NET infrastructure. Typically, the infrastructure of ASP.NET includes a few built-in HTTP handlers and HTTP modules, such as those for authentication, output caching, session state, and a bunch of container or service classes such as HttpContext and HttpRuntime. To a large extent, ASP.NET MVC can be considered as a specialization of the classic ASP.NET runtime environment that just supports a different application and programming model. ASP.NET MVC applications have full access to any built-in components that populate the ecosystem of ASP.NET, including Cache, Session, OutputCache, and the authentication layer. Nothing is different in ASP.NET MVC in the way in which these components can be used. So what s really the purpose of this chapter Because ASP.NET MVC is essentially an extension of the ASP.NET runtime, it comes with its own runtime shell inside of which, you ll find that your perception of things is a bit different and features are more coarse-grained. Where traditional ASP.NET controls abstract much of the underlying markup, ASP.NET MVC encourages you to work with the markup nuts and bolts directly. From this perspective, the infrastructure of an ASP.NET MVC application is made of aspects that can be considered to be system oriented, such as authentication and routing as well as aspects that were originally catalogued as programming features, such as error handling and localization. Among other things, error handling is related to forms of Search Engine Optimization (SEO), and localization is a feature that is becoming so important and widely used as to justify a full discussion about the options and the tools you have available to make it happen. Finally, the .NET developer of the next decade whether that person is a Web, Windows, or WPF developer can t avoid getting at least a working knowledge of dependency injection and related Inversion of Control (IoC) container frameworks. From the perspective of ASP.NET MVC applications, therefore, exposing a global object factory that can traverse an offline catalog of dependencies and resolve them to a graph of objects is a definite plus, if not a must-have capability. In a nutshell, this chapter is a collection of distinct and, to some extent, self-contained topics each touching on a feature that many ASP.NET MVC applications out there already have or are likely to have in the future.
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In 2, The Runtime Environment, I covered the basics of URL routing and ASP.NET MVC routes. In this chapter, I delve deeper into some specific aspects of using and defining routes, such as ordering, constraints, SEO, testing, and more importantly design of URLs.
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Ultimately, a route is a pattern that the URL-routing HTTP module attempts to recognize in the URL of the request being processed. If the URL-routing HTTP module finds a match, the selected route is picked up and processed in some way. At a minimum, a route comes with a schema for the URL and a route handler that decides which HTTP handler for the associated action is required. Let s start by reviewing how a route is formally defined in the system.web.routing namespace, which is now part of the ASP.NET framework and no longer a feature specific to ASP.NET MVC.
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A route is defined as an instance of the type Route, defined as follows. Note that the base class RouteBase simply provides an abstract definition of the two overridden methods you find in the following code:
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public class Route : RouteBase { // Constructors public Route(string url, IRouteHandler routeHandler); public Route(string url, RouteValueDictionary defaults, IRouteHandler routeHandler); ... // Methods public override RouteData GetRouteData( HttpContextBase httpContext); public override VirtualPathData GetVirtualPath( RequestContext requestContext, RouteValueDictionary values); protected virtual bool ProcessConstraint( HttpContextBase httpContext, object constraint, string parameterName, RouteValueDictionary values, RouteDirection routeDirection);
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