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To make those Add to cart buttons work, you ll need to create a new controller class, CartController, which features action methods for adding items to the cart and later removing them. But hang on a moment what cart You ve defined the Cart class, but so far that s all. There aren t yet any instances of it available to your application, and in fact you haven t even decided how that will work. Where are the Cart objects stored in the database or in web server memory Is there one universal Cart shared by everyone, does each visitor have a separate Cart instance, or is a brand new instance created for every HTTP request

RegularHeight = @RegularHeight, ThumbnailUrl = @ThumbnailUrl, ThumbnailWidth = @ThumbnailWidth, ThumbnailHeight = @ThumbnailHeight, IsActive = @IsActive, IsShared = @IsShared, Modified = GETDATE() WHERE ID = @PhotoID GO GRANT EXEC ON pap_UpdatePhoto TO PUBLIC GO

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Obviously, you ll need a Cart to survive for longer than a single HTTP request, because visitors will add CartLines to it one by one in a series of requests. And of course each visitor needs a separate cart, not shared with other visitors who happen to be shopping at the same time; otherwise, there will be chaos. The natural way to achieve these characteristics is to store Cart objects in the Session collection. If you have any prior ASP.NET experience (or even classic ASP experience), you ll know that the Session collection holds objects for the duration of a visitor s browsing session (i.e., across multiple requests), and each visitor has their own separate Session collection. By default, its data is stored in the web server s memory, but you can configure different storage strategies (in process, out of process, in a SQL database, etc.) using Web.config.

So far, this discussion of shopping carts and Session is obvious But wait! You need to understand that even though ASPNET MVC shares many infrastructural components (such as the Session collection) with older technologies such as classic ASP and ASPNET Web Forms, there s a different philosophy regarding how that infrastructure is supposed to be used If you let your controllers manipulate the Session collection directly, pushing objects in and pulling them out on an ad hoc basis, as if Session were a big, fun, free-for-all global variable, then you ll hit some maintainability issues.

The components of the client object model consist of a WCF web service and several primary .dll libraries. When you are doing development against the client object model, if your development environment does not have SharePoint 2010 installed, you will need to copy the .dlls found in the following locations to your development environment.

Listing A-24. FlickrHelper.cs using using using using using using using using using System; System.Collections.Generic; System.Configuration; System.IO; System.Net; System.Web.Configuration; System.Xml; 05.CustomSiteMapProvider; 05.PhotoAlbumProvider;

What if controllers get out of sync, one of them looking for Session["Cart"] and another looking for Session["_cart"] What if a controller assumes that Session["_cart"] will already have been populated by another controller, but it hasn t What about the awkwardness of writing unit tests for anything that accesses Session, considering that you d need a mock or fake Session collection In ASPNET MVC, it s often desirable for an action method to act only on its incoming parameters, and not read or write values on HttpContext, Session, or any other state external to the controller If you can achieve that (which you can do usually, but not necessarily always), then you have placed a limit on how complex your controllers and actions can get It leads to a semantic clarity that makes the code easy to comprehend at a glance.

By definition, such stand-alone methods are also easy to unit test, because there is no external state that needs to be simulated Ideally, then, our action methods should be given a Cart instance as a parameter, so they don t have to know or care about where those instances come from That will make unit testing easy: tests will be able to supply a Cart to the action, let the action run, and then check what changes were made to the Cart This sounds like a good plan!.

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