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Given that you have a choice between Xaml and C#, which should you use Xaml is often easier because you can use tools such as Visual Studio s Xaml designer (or even Expression Blend) to edit the appearance and layout this can take much less effort than tweaking code repeatedly until the outcome looks the way you want. Obviously, if developers and designers are involved, Xaml is preferable by far, because it enables designers to tweak and refine the appearance without needing to involve developers for every change. But even for a UI being created entirely by developers, an interactive design surface is a much more efficient way to create a layout than code. This doesn t mean you should go out of your way to avoid creating elements in code, however, particularly if code looks like the most straightforward solution to a problem. Use whichever approach is more convenient for the task at hand. Now that we ve seen that Xaml is really just a way of creating objects, what types of objects do Silverlight and WPF offer

Suppose our application provides a URL (e.g., as part of a search this site functionality), http://www.mywwwservice.com/query question=cookies, which returns HTML documents containing the following fragment: ... <p>Your query for 'cookies' returned the following results:</p> ... That is, the value of the query parameter question is inserted into the page returned by mywwwservice.com. We assume further that the data is not validated, filtered, or escaped. Now suppose that an attacker manages to cause our user Alice to load the following URL into her browser for example, by tricking her into clicking a link, or by luring her into viewing a harmless-looking page that sources this URL in an invisible <iframe>: http://www.mywwwservice.com/query question=cookies+%3Cscript%3Emalicious-script%3C/script%3E The document loaded into the browser in response to this request will contain the following HTML fragment: <p>Your query for 'cookies <script>malicious-script</script>' returned the following results:</p> The string included into the HTML fragment is the URL-decoded version of the question query parameter, whose value was chosen by the attacker. However, this string represents an HTML <script> tag, the contents of which are executed as JavaScript in the context of the page the <script> tag appeared in. We thus have a situation in which script chosen by an attacker (which we have denoted with the placeholder malicious-script in the example) executes in the context of a page loaded from a URL in our domain. Since this situation involves script controlled by one entity (often a malicious web site) to be evaluated in the context of a page loaded from another site, it is commonly referred to as cross-site scripting (XSS).7

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Some of the types used to construct a user interface are interactive elements with a distinctive behavior of their own, such as buttons, checkboxes, and listboxes. Although you need code to connect these elements to your application, they have some built-in interactive behavior: buttons light up when the mouse cursor moves over them and look pushed in when clicked; listboxes allow items to be selected; and so on. Other elements are more primitive. There are graphical shape elements and text elements, which are visible to the user but which don t have an intrinsic behavior if you want them to do more than simply be visible you need to write code to make that happen. And some elements don t even appear directly; for example, there are layout elements that are often not visible themselves, as their job is to decide where other elements go. You can tell what type of element you re dealing with by looking at the corresponding .NET type s base class. Most UI elements ultimately derive from FrameworkEle ment, but this class has some more specialized subtypes. Panel is the base class of layout elements. Shape is the base class of elements involving 2D graphical shapes. Control is the base class of elements that have some intrinsic interactive behavior of their own.

This means that not all UI elements are controls. In fact, the majority of UI elements are not controls. Having said that, the term control is often used loosely many authors, and even some parts of Microsoft s documentation, use the term control to describe any UI element, including ones that don t in fact derive from Control. To further confuse the issue there s a System.Windows.Controls namespace, in which not all of the types derive from Control. We believe this is confusing, so in this book, we will use the term control only when talking about types that derive from Control. When we re discussing features that apply to all UI objects that derive from FrameworkElement (which includes all controls) we will use the more general term element. But be aware that you will come across other, more confusing conventions on the Web and in other books.

Before we get to the controls, we ll look at how elements are positioned and sized interactive elements are not much use if you can t choose where they appear.

elements. You choose a particular concrete derived type to determine which layout mechanism to use. Silverlight version 3 offers three panel types: Grid, StackPanel, and Canvas. WPF provides these and a few more, as we ll see shortly.

default in a new UI. As the name suggests, it carves up the available space into rows and columns, and then positions child elements into the resultant grid cells. By default, a Grid has a single row and a single column, making just one big cell, but you can add more. Example 20-4 shows how to do this.

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