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22.1 Understanding the portable area
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The portable area is a concept that comes from the MvcContrib project. As the name suggests, it s a native MVC 2 area packaged up in a way that s easier to distribute and consume than an area built with the out-of-the-box MVC 2 support. That s a pretty broad statement, so let s first look at what s in an area and then cover which pieces may need to be made portable. Areas are a subset of an MVC application that are separated in a way that gives them some physical distance from other groups of functionality in the application. This means that an area will have one or more routes, controllers, actions, views, partial views, master pages, and content files, such as CSS, JavaScript, and image files. These are all the pieces that may be used in an area. Of those individual elements, many aren t part of the binary distribution of an MVC application. Only the routes, controllers, and actions get compiled into an assembly. The rest of the elements are individual files that need to be copied and managed with the other assets that are part of the application. This is reasonably trivial to manage if we build an area for our application and just use it as a way of managing smaller modules of the application. But if we want to use an area as a way of packaging up and sharing or distributing a piece of multipage UI functionality, managing all of the individual files make this option a bad choice when integrating someone else s component with our application. This is where the MvcContrib project developed the idea of portable areas. By building on top of the existing area functionality, it only takes some minor changes to an area project to make it portable. A portable area is simply an area that can be deployed as a single DLL. The process of making an area portable is trivial. As area developers, instead of leaving the file assets as content items in your project, we make them embedded resources. An embedded resource is a content file that s compiled into the assembly of a project. The file still exists, and it can be programmatically extracted from the assembly at runtime. This means that a portable area only contains a single file, the assembly of the project, rather than all the individual content files.
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22.2 A simple portable area
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A portable area is a class library project with controllers and views. It has all the trappings of an ASP.NET MVC 2 project: controllers, folders for views, and the views themselves. To extract the AccountController, we ll move those related files from the default template
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Portable areas
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to a new class library project. The overall structure of the project is the same, but it s not a web project, as shown in figure 22.1. Developers familiar with the ASP.NET MVC 2 default template will recognize most of the files in the portable area shown in figure 22.1. For the most part, the content is exactly the same, and it s in the same structure. But the views aren t content files like in ASP.NET MVC 2 projects; they re embedded resources. To make a view an embedded resource, select it in Solution Explorer and press the F4 key, or right-click it and select Properties from the context menu. The Properties window (shown in figure 22.2) will appear. For the Build Action, select Embedded Resource to instruct Visual Studio to include the file as an embedded resource of the project.
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A portable area class library project
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Embedded resources
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Embedded resources are project artifacts that are compiled into the assembly, and they can be programmatically retrieved. Normally, views are set with a Build Action of Content, which means they ll be stored and accessed like regular files in the filesystem. Class files have a Build Action of Compile, which compiles them into the assembly regularly. For more information on embedded resources, visit the MSDN reference page: http://mng.bz/Uz67.
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Like regular areas, portable areas must be registered. This is done by inheriting from a base class provided by MvcContrib, PortableAreaRegistration, as shown in listing 22.1.
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