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To make matters more interesting, in almost every case you will be blissfully unaware that you have actually set (or accessed) a dependency property as opposed to a CLR property! For example, the Height and Width properties that WPF controls inherit from FrameworkElement, as well as the Content member inherited from ControlContent, are all, in fact, dependency properties: <!-- Set three dependency properties! --> <Button x:Name = "btnMyButton" Height = "50" Width = "100" Content = "OK"/> Given all of these similarities, why does WPF defines a new term for such a familiar concept The answer lies in how a dependency property is implemented within the class. You l see a coding example in just a little bit; however, from a high level, all dependency properties are created in the following manner: First, the class that defined a dependency property must have DependencyObject in its inheritance chain. A single dependency property is represented as a public, static, read-only field in the class of type DependencyProperty. By convention, this field is named by suffixing the word Property to the name of the CLR wrapper (see final bullet point). The DependencyProperty variable is registered via a static call to DependencyProperty.Register(), which typically occurs in a static constructor or inline when the variable is declared. Finally, the class will define a XAML-friendly CLR property, which makes calls to methods provided by DependencyObject to get and set the value.

Ideally, as a developer you shouldn t need to worry about the specifics of WS-Interoperability. Instead, .NET should respect its rules implicitly. The way .NET 2.0 handles this is with a new WebServiceBinding attribute that is automatically added to your web service class when you create it in Visual Studio: <WebServiceBinding(ConformsTo := WsiProfiles.BasicProfile1_1)> _ Public Class MyService Inherits WebService Private ... End Class The WebServiceBinding attribute indicates the level of compatibility you re targeting. Currently, the only option is WsiProfiles.BasicProfile1_1, which represents the WS-Interoperability Basic Profile 1.1. However, as standards evolve there will be newer versions of SOAP and WSDL, as well as newer versions of the WS-Interoperability profile that go along with them. Once you have the WebServiceBinding attribute in place, .NET will warn you with a compile error if your web service strays outside the bounds of allowed behavior. By default, all .NET web services are compliant, but you can inadvertently create a noncompliant service by adding certain attributes. For example, it s possible to create two web methods with the same name, as long as their signatures differ and you give them different message names using the MessageName property of the WebMethod attribute. However, this behavior isn t allowed according to the WS-Interoperability profile; it generates the error page shown in Figure 32-1 when you try to run the web service.

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Once implemented, dependency properties provide a number of powerful features that are used by various WPF technologies including data binding, animation services, styles, and so forth. In a nutshell, the motivation of dependency properties is to provide a way to compute the value of a property based on the value of other inputs. Here is a list of some of these key benefits, which go well beyond those of the simple data encapsulation found with a CLR property: Dependency properties can inherit their values from a parent element s XAML definition. For example, if you defined a value for the FontSize attribute in the opening tag of a <Window>, all controls in that Window would have the same font size by default. Dependency properties support the ability to have values set by elements contained within their XAML scope, such as a Button setting the Dock property of a DockPanel parent. (Recall from 28 that attached properties do this very thing, as attached properties are a form of dependency properties.) Dependency properties allow WPF to compute a value based on multiple external values, which can be very important for animation and data binding services. Dependency properties provide infrastructure support for WPF triggers (also used quite often when working with animation and data binding).

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