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The exception handler must have two parameters: an object and an int. The first is the sender object, a reference to the thread that raised the exception. This will always be the thread that added the thread exception handler. If some other thread causes an unhandled thread exception to be raised, the Application thread exception handler will not catch the exception. The thread exception handler will only catch thread exceptions that are raised TIP on the main thread of the application. If an unhandled thread exception is raised on some other thread, the thread will terminate. This underscores the importance of using try/catch statements. The following code example creates a thread that attempts to call Resume on myThread. If the thread is in any other state than suspended, this will cause an exception to be generated.

Instead of using primary colors in certain combinations to identify a color, other attributes can be used. Some color spaces identify a color by its hue, which is basically the position on the rainbow, its saturation or pureness of the color, and its brightness (or value, or lightness). The two most common ones are HSV (for Hue, Saturation and Value) and HLS (Hue, Lightness and Saturation). Many people feel that a color is most naturally identified with these color spaces, because they closely reflect the way we perceive colors. When we see a color, typically we first observe its hue, i.e., whether it is green or purple or red. The next thing we notice is its saturation whether it s a pastel tint or a pure color. And finally we take note of the brightness of the color. Conversion from HSV or HLS to RGB is, unfortunately, not a linear process. Appendix B contains the algorithms for conversion to and from these color spaces. Before looking at those, it is probably important to understand how the HSV coordinates can be seen in terms of the RGB color cube. Hue is normally expressed as a value from 0 to 360, which indicates a position on the color circle. The colors on the circle are arranged in the same order as they are on the rainbow, but in a circle, with pure red at an angle of 0 (and, of course, 360), green at 120 and blue at 240 degrees. All the colors with the same hue form a plane in the RGB color cube, as can be seen in figure 1.3.

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You can t just shove a FlowDocument directly into XAML. Instead, you have to put it into one of several container controls provided by WPF. In the example, we use a FlowDocumentReader b, which is a fairly rich document container it provides the search, paging, and zoom controls. You may remember the discussion on whitespace from chapter 3. The FlowDocument doesn t quite behave like regular XAML. By default, it does not use normalized spacing but automatically removes spacing around tags. Setting space to be preserved c gives us a much better result but also means that we can t wrap lines. If you take the version of the listing as wrapped for the book, it gets seriously ugly. All the content we put into a FlowDocument has to be inside of some sort of a container, such as a Paragraph d or a List. Paragraph is a lot like a TextBlock, and we can add items in a similar way. FlowDocument also has support for tables, sections, and other word-processy things. As with a TextBlock, we can add controls e. In this example, we add a button and some radio buttons. Later on, we add some shapes as well. To the layout manager, it s all the same. One of the really, really cool things about WPF something that we can t emphasize enough4 is that the whole system is based on composition. In the past, you might have bought a third-party control that let you deal with rich text, or, if desperate, made use of the built-in RTF control in Windows. That control did its own thing. Here, you have a control that lets you arbitrarily embed any type of control within it and handles it appropriately. More than that, the FlowDocument is held in a container

using using using using System; System.Collections.Generic; System.Linq; System.Text;

To keep things simple and to focus on TVPs, I didn t make this code robust enough to handle concurrency issues. For example, the method of getting the next OrderID number will likely result in duplicate IDs in a multiuser environment. So don t use this code in a production environment without beefing it up to handle your environment!

How you deal with an optimistic concurrency failure is up to your application you might simply be able to retry the work, or you may have to get the user involved. It will depend on the nature of the data you re trying to update.

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