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In this section, we ll take a closer look at bubbling routed events by looking at an example program. This program creates a window with an area on the left and an area on the right. In the area on the left, we ll raise and handle events and see how they bubble through the elements. The output will go to the area on the right, allowing you to see which events are being raised, and in which order. There s also a button on the right side, to clear the results between different tries. The area on the left consists of a StackPanel that contains a Border, which contains a Label, which contains an Image. The Image, the Label, and the Border have event handlers for the MouseUp event. Figure 9-4 shows the element tree.

Microsoft has aimed to address these issues and also to integrate WCF and WF closer than ever before.

End-of-line comments are allowed. Delimited comments are not allowed in a preprocessor directive line.

Space before #define BudgetVersion // OK # define MediumVersion // OK Space between Delimited comments are not allowed. #define PremiumVersion /* all bells & whistles */ End-of-line comments are fine. #define BudgetVersion // Stripped-down version The preprocessor directives are listed in Table 23-1. Table 23-1. Preprocessor Directives

Silverlight is a new web presentation technology that is created to run on a variety of platforms. It enables the creation of rich, visually stunning and interactive experiences that can run everywhere: within browsers and on multiple devices and desktop operating systems (such as the Apple Mac).

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Figure 9-4. When a bubbling event is raised at an element, it is passed up the tree, and any element with an event handler for the event will execute it. Figure 9-5 shows the output of the program when you click various parts of the left part of the window. You can see on the right side of each window that the event is handled first by the element clicked and then by the successive elements above it that have a handler.

#define identifier #undef identifier #if expression #elif expression #else #endif #region name #endregion name #warning message #error message #line indicator #pragma text

http://silverlight.net/content/GetStarted.aspx Some might say that Silverlight is Microsoft s version of Adobe s Flash and Flex products. This doesn t really do it justice, though. Silverlight has a number of compelling features that make it an ideal choice for creating web applications with the functionality traditionally only found in desktop applications. These applications are known as Rich Internet Applications (or RIA to its friends). Silverlight offers the following: Ability to use the .NET development tools you know and love Utilize many of the .NET framework libraries in your applications (for security reasons, not everything is available) An easy-ish path to convert web applications to desktop (WPF) applications if required in the future (also check out Silverlight 3 s offline capabilities in 15) Great media-streaming capabilities Support for designers (more prevalent in Blend)

The following is the markup for the program. Notice that the Border, the Label, and the Image all set event handlers. <StackPanel Orientation="Horizontal" > <Border Name="myBorder" BorderThickness="10" BorderBrush="BurlyWood" MouseUp="myBorder_MouseUp"> <Label Name="myLabel" Padding="10" MouseUp="myLabel_MouseUp"> <Image Name="cat" Source="DarwinFace.jpg" Stretch="None" MouseUp="cat_MouseUp"/> </Label> </Border> <StackPanel> <Button Name="Clear" Padding="10,3" Click="Clear_Click">Clear</Button> <TextBlock Name="tb" Margin="5,5,0,0"></TextBlock> </StackPanel> </StackPanel> The following are the event handlers that are added to the Window1 class. The three MouseUp handlers just add text to the output window showing which event is being handled. The button Click handler clears the output. Notice that for the first three handlers, the second parameter is MouseButtonEventArgs. This is a subclass of RoutedEventArgs that can carry addition information such as the states of the various mouse buttons when the event occurred. private void cat_MouseUp( object sender, MouseButtonEventArgs e ) { tb.Text += "Image sees it.\r\n"; } private void myLabel_MouseUp( object sender, MouseButtonEventArgs e ) { tb.Text += "Label sees it.\r\n"; } private void myBorder_MouseUp( object sender, MouseButtonEventArgs e ) { tb.Text += "Border sees it.\r\n"; } private void Clear_Click( object sender, RoutedEventArgs e ) { tb.Text = ""; }

Defines a compilation symbol Undefines a compilation symbol If the expression is true, compiles the following section If the expression is true, compiles the following section If the previous #if or #elif expression is false, compiles the following section Marks the end of an #if construct Marks the beginning of a region of code; has no compilation effect Marks the end of a region of code; has no compilation effect Displays a compile-time warning message Displays a compile-time error message Changes the line numbers displayed in compiler messages Specifies information about the program context

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