asp.net code 128 barcode An action that uses Session in .NET

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Listing 7.6 An action that uses Session
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public ActionResult ViewCart() { const string key = "shopping_cart"; if(Session[key] == null) Session.Add(key, new Cart()); var cart = (Cart) Session[key]; return View(cart); }
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Accesses session via property
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Just like in previous versions of Active Server Pages (ASP), you can access the session directly via a property reference B. This programming experience goes all the way back to ASP 1.0 and has been carried through ASP.NET and ASP.NET MVC.
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Listing 7.7 Testing controllers that use Session
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[Test] public void SessionTest() { var controller = new HomeController(); var httpContext = MockRepository.GenerateStub<HttpContextBase>(); var mockSession = MockRepository.GenerateMock<HttpSessionStateBase>(); httpContext.Stub(x => x.Session) Sets up fake session .Return(mockSession).Repeat.Any(); const string key = "shopping_cart"; mockSession.Expect(x => x[key]).Return(null); mockSession.Expect(x => x.Add(null, null)).IgnoreArguments(); mockSession.Expect(x => x[key]).Return(new Cart()); controller.ControllerContext = new ControllerContext(httpContext, new RouteData(), controller); controller.ViewCart(); mockSession.VerifyAllExpectations(); }
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Invokes action
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Verifies expected methods were called
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In listing 7.7, session is retrieved through the controller s HttpContext property (which in turn comes from ControllerContext.HttpContext), so we must create a stub for it to return our mocked session object. Sadly, the only way you d know this is by viewing the source or by using Reflector. Once we have the test double in place, we can set it up with canned data that the action method will use. The setting-up-the-fake-session code could be placed inside a test helper class so that you have a cleaner test. Something like this would be much nicer:
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var controllerContext = new FakeControllerContext(); var mockSession = controllercontext.HttpContext.Session; mockSession.Stub(...);
The other form of user-specific data storage lies in HTTP cookies, which we ll examine next.
Cookies
Cookies store tiny bits of information in the client s browser. They can be useful to track information, such as where a user has been. By default, the user s session ID is stored in a cookie. It s important to not entirely rely on the contents of a cookie. Cookies can be disabled by the user, and malicious users may even attempt to tamper with the data. In ASP.NET, you re used to adding cookies like this:
Response.Cookies.Add( new HttpCookie("locale", "en-US") );
That API works going forward in ASP.NET MVC. The only difference is that the Response property of the controller is HttpResponseBase, rather than the sealed HttpResponse class in Web Forms. You can test actions that use cookies much as we tested against the Cache or Session in previous sections.
Request storage
Sometimes you need data to be stored for a single web request only. Because individual requests are served by threads, it might be tempting to put a [ThreadStatic] attribute on a piece of data and expect it to work. But ASP.NET occasionally reuses threads for other requests, so this is a poor choice for ASP.NET if you want to avoid mixing data in requests from two separate users.
NHibernate Session-per-Request pattern
If you re familiar with NHibernate (http://nhibernate.org), you may be familiar with the Session-per-Request pattern. It refers to the lifecycle of the NHibernate Session object in web environments it s common to open the session at the beginning of the request and close it at the end. Throughout the request, the current session is available in HttpContext.Items. There s an example of this in chapter 23.
Tracing and debugging
As has been the case since the advent of ASP.NET 1.0, you access request storage through HttpContext.Items, and it s guaranteed to be isolated from other concurrent requests. This works in ASP.NET MVC, but the actual HttpContext property of the Controller class is of type HttpContextBase. This ensures that your controllers remain testable because you can mock HttpContextBase easily. We ve examined the ways of storing and retrieving data in ASP.NET and how they work with MVC. Next, we ll investigate the tracing and debugging experience.
Tracing and debugging
Tracing and debugging work much as they have since ASP.NET 2.0. The same techniques for placing breakpoints and stepping through code with Visual Studio apply. With tracing, though, there s a slightly different story. Tracing is configured with the Web.config file. The configuration shown in listing 7.8 will enable tracing for an ASP.NET application.
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