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Now assume the Point class contains a reference type member variable of type PointDescription. This class maintains a point s friendly name as well as an identification number expressed as a System.Guid (if you don t come from a COM background, know that a globally unique identifier [GUID] is a statistically unique 128-bit number). Here is the implementation: // This class describes a point. public class PointDescription { public string PetName {get; set;} public Guid PointID {get; set;} public PointDescription() { PetName = "No-name"; PointID = Guid.NewGuid(); } } The initial updates to the Point class itself included modifying ToString() to account for these new bits of state data, as well as defining and creating the PointDescription reference type. To allow the outside world to establish a pet name for the Point, you also update the arguments passed into the overloaded constructor:

public partial class MainWindow : Window { string mouseActivity = string.Empty; public MainWindow() { InitializeComponent(); } public void btnClickMe_Clicked(object sender, RoutedEventArgs e) { AddEventInfo(sender, e); MessageBox.Show(mouseActivity, "Your Event Info"); // Clear string for next round. mouseActivity = ""; } private void AddEventInfo(object sender, RoutedEventArgs e) { mouseActivity += string.Format( "{0} sent a {1} event named {2}.\n", sender, e.RoutedEvent.RoutingStrategy, e.RoutedEvent.Name); } private void outerEllipse_MouseDown(object sender, MouseButtonEventArgs e) { AddEventInfo(sender, e); } private void outerEllipse_PreviewMouseDown(object sender, MouseButtonEventArgs e) { AddEventInfo(sender, e); } } Notice that you are not halting the bubbling of an event for any event handler. If you run this application, you will see a unique message box display based on where you click the button. Figure 31-6 shows the result of clicking on the outer Ellipse object:

Retrieving Cached Data with cache_get() and cache_get_multiple()

So, why do WPF events typically tend to come in pairs (one tunneling and one bubbling) The answer is that by previewing events, you have the power to perform any special logic (data validation, disable bubbling action, etc.) before the bubbling counterpart fires. By way of an example, assume you have a TextBox that should only contain numerical data. You could handle the PreviewKeyDown event, and if you see the user has entered non-numerical data, you could cancel the bubbling event by setting the Handled property to true. As you would guess, when you are building a custom control that contains custom events, you could author the event in such a way that it can bubble (or tunnel) through a tree of XAML. For the purpose of this chapter, I will not be examining how to build custom routed events (however, the process is not that different from building a custom dependency property). If you are interested, check out the topic Routed Events Overview within the .NET Framework 4.0 SDK documentation. Here, you will find a number of tutorials which will help you on your way.

There are a few more preparatory topics to investigate before you begin learning how to build custom controls Specifically, you need to learn the distinction between a logical tree, a visual tree and a default template When you are typing XAML into Visual Studio 2010, Expression Blend, or a tool such as kaxamlexe, your markup is the logical view of the XAML document As well, if you author C# code that adds new items to a StackPanel control, you are inserting new items into the logical tree Essentially, a logical view represents how your content will be positioned within the various layout managers for a main Window (or another root element, such as Page or NavigationWindow) However, behind every logical tree, there is a much more verbose representation termed a visual tree, which is used internally by WPF to correctly render out elements onto the screen.