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So far, you ve focused on adding bindings that link two elements. But in data-driven applications, it s more common to create binding expressions that draw their data from a nonvisual object. The only requirement is that the information you want to display must be stored in public properties. The WPF data binding infrastructure won t pick up private information or public fields. When binding to an object that isn t an element, you need to give up the Binding.ElementName property and use one of the following properties instead: x x

Source. This is a reference that points to the source object in other words, the object that s supplying the data. RelativeSource. This points to the source object using a RelativeSource object, which allows you to base your reference on the current element. This is a specialized tool that s handy when writing control templates and data templates.

DataContext. If you don t specify a source using the Source or RelativeSource property, WPF searches up the element tree, starting at the current element. It examines the DataContext property of each element and uses the first one that isn t null. The DataContext property is extremely useful if you need to bind several properties of the same object to different elements, because you can set the DataContext property of a higher-level container object, rather than setting it directly on the target element.

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The difference between the three options is quite simple. With bubbling, the event is dispatched and starts from the event owner. If the owner does not handle the event (and it very well may not), the event continues upward to the owner s parent control. This control could then handle the event, but the event could be passed upward once more. This pattern continues until a control handles the event or the event reaches the root node and has not been handled. Tunneling is the opposite approach in that the event starts with the root node and, if not handled there, is passed down to the next descendent that is the ancestor of the event owner. The ending condition in this scenario is when the event is unhandled and arrives at the event owner. The direct method circumvents event routing for instances in which the direction of an event is irrelevant. However, when using the direct method, you can still use other RoutedEvent functionality in your code.

Everything you ve done thus far all works fine if your client has CardSpace installed. Not everyone will have Internet Explorer 7 or a third-party browser with CardSpace support. This section focuses on JavaScript, which can be used to help you determine whether Internet Explorer 7 or a supported browser is installed. Follow these steps: 1. Begin by opening Visual Studio 2005. 2. From the menu, select File New Web Site.

The Source property is quite straightforward. The only catch is that you need to have your data object handy in order to bind it. As you ll see, you can use several approaches for getting the data object: pull it out of a resource, generate it programmatically, or get it with the help of a data provider. The simplest option is to point the Source to some static object that s readily available. For example, you could create a static object in your code and use that. Or, you could use an ingredient from the .NET class library, as shown here: <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily}, Path=Source}"></TextBlock> This binding expression gets the FontFamily object that s provided by the static SystemFonts.IconFontFamily property. (Notice that you need the help of the static markup extension to set the Binding.Source property.) It then sets the Binding.Path property to the FontFamily.Source property, which gives the name of the font family. The result is a single line of text. In Windows Vista or Windows 7, the font name Segoe UI appears. Another option is to bind to an object that you ve previously created as a resource. For example, this markup creates a FontFamily object that points to the Calibri font: <Window.Resources> <FontFamily x:Key="CustomFont">Calibri</FontFamily> </Window.Resources> And here s a TextBlock that binds to this resource: <TextBlock Text="{Binding Source={StaticResource CustomFont}, Path=Source}"></TextBlock> Now the text you ll see is Calibri.

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