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One of the great things about methods is that we can use them to keep breaking things into smaller and smaller pieces. Suppose we have some method called PlaceOrder, which has a well-defined responsibility, but which is getting a bit complicated. We can just split its implementation into smaller methods say, CheckCustomerCredit, AllocateStock, and IssueRequestToWarehouse. These smaller methods do different bits of the work for us. This general technique, sometimes called functional decomposition, has a long history in mathematics. It was explored academically in computing applications as early as the 1930s. Bearing in mind that the first working programmable computers didn t appear until the 1940s, that s quite a pedigree. In fact, it has been around for so long that it now seems obvious to most people who have had anything to do with computer programming. That s not the end of the story, though. Methods are great for describing the dynamics of a system how things change in response to particular input data (the method arguments), and the results of those changes (a function s return value, or a method s side effects). What they re not so good at is describing the current state of the system. If we examine a set of functions and a load of variables, how can we work out which pieces of information are supposed to be operated on by which functions If methods were the only tool available for abstraction, we d have a hard time telling the difference between the double that describes my blood pressure, and can be operated on by this method:

Each gadget has configuration options available in the upper left corner of its window. Click the gadget s wrench icon to display an About dialog box for your mashup, shown in Figure 6-17, that has two links: Customize this: This link takes you to Popfly, and if you have an account and are logged in, opens the blocks used to create the gadget in the mashup editor. I want this: This link opens the creator s Popfly page and shows the mashup information for it. Click OK or Cancel to close the window.

void LowerMyBloodPressure(double pressureDelta)

and the double that describes my weight and can be affected by this method:

void EatSomeDonuts(int quantityOfDonuts)

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Second, we believe that to date no comprehensive treatment of cross-domain security is available, and we fill that gap The security issues discussed in this chapter can manifest themselves when a user views a page on a malicious web site,2 and is interacting (or has interacted at an earlier time) with our web application in the same browser, possibly in a different window For example, our user might have browsed to our application(the good one), hosted at wwwmywwwservicecom, and then opened a new browser window to browse to wwwhackerhomeorg (We will ignore for the moment the question of what might have compelled the user to visit this site; perhaps he received an e-mail with a link to the site and a promise of things free and desirable.

As programs get ever larger, the number of system state variables floating around increases, and the number of methods can explode exponentially. But the problems aren t

just about the sheer number of functions and variables you end up with. As you try to model a more complex system, it becomes harder to work out which functions and variables you actually need what is a good decomposition of the system Which methods relate to one another, and to which variables

Not all objects behave in the same way when you use them through the dynamic keyword. C# distinguishes between three kinds of objects for dynamic purposes: COM objects, objects that choose to customize their dynamic behavior, and ordinary .NET objects. We ll see several examples of that second category, but we ll start by looking at the most important dynamic scenario: interop with COM objects.

COM objects such as those offered by Microsoft Word or Excel get special handling from dynamic. It looks for COM automation support (i.e., an implementation of the IDispatch COM interface) and uses this to access methods and properties. Automation is designed to support runtime discovery of members, and it provides mechanisms for dealing with optional arguments, coercing argument types where necessary. The dynamic keyword defers to these services for all member access. Example 18-6 relies on this.

static void Main(string[] args) { Type appType = Type.GetTypeFromProgID("Word.Application"); dynamic wordApp = Activator.CreateInstance(appType); dynamic doc = wordApp.Documents.Open("WordDoc.docx", ReadOnly:true); dynamic docProperties = doc.BuiltInDocumentProperties; string authorName = docProperties["Author"].Value; doc.Close(SaveChanges:false); Console.WriteLine(authorName);

) If we have not taken specific precautions when designing and implementing our web application, code embedded in the malicious web page from wwwhackerhomeorg might be able to gain access to this user s session with our application, learn sensitive data associated with this user within the context of our application, or maliciously make requests to our application that appear to originate from this user Since these types of security issues relate to (undesired) interactions between the application hosted in our domain (wwwmywwwservicecom) and pages hosted in another domain (wwwhackerhomeorg), we refer to them as cross-domain security issues..

}

You can also see your gadget along with other installed gadgets by right-clicking the Windows Sidebar and selecting the Add Gadget menu item to display a gallery of installed gadgets on your computer (see Figure 6-18).

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