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public static readonly DependencyProperty HeightProperty; // The DependencyProperty field is often registered // in the static constructor of the class. static FrameworkElement() { ... HeightProperty = DependencyProperty.Register( "Height", typeof(double), typeof(FrameworkElement), new FrameworkPropertyMetadata((double) 1.0 / (double) 0.0, FrameworkPropertyMetadataOptions.AffectsMeasure, new PropertyChangedCallback(FrameworkElement.OnTransformDirty)), new ValidateValueCallback(FrameworkElement.IsWidthHeightValid)); } // The CLR wrapper, which is implemented using // the inherited GetValue()/SetValue() methods. public double Height { get { return (double) base.GetValue(HeightProperty); } set { base.SetValue(HeightProperty, value); } } } As you can see, dependency properties require quite a bit of additional code from a normal CLR property! And in reality, a dependency can be even more complex than what you see here (thankfully, many implementations are simpler than Height). First and foremost, remember that if a class wants to define a dependency property, it must have DependencyObject in the inheritance chain, as this is the class which defines the GetValue() and SetValue() methods used in the CLR wrapper. Since FrameworkElement is-a DependencyObject, this requirement is satisfied. Next, recall that the entity which will hold the actual value of the property (a double in the case of Height) is represented as a public, static read-only field of type DependencyProperty. The name of this field should, by convention, always be named by suffixing the word Property to the name of the related CLR wrapper, like so: public static readonly DependencyProperty HeightProperty; Given that dependency properties are declared as static fields, they are typically created (and registered) within the static constructor of the class. The DependencyProperty object is created via a call to the static DependencyProperty.Register() method. This method has been overloaded many times; however, in the case of Height, DependencyProperty.Register() is invoked as follows: HeightProperty = DependencyProperty.Register( "Height", typeof(double), typeof(FrameworkElement), new FrameworkPropertyMetadata((double)0.0, FrameworkPropertyMetadataOptions.AffectsMeasure,

SOAP was originally considered an acronym (Simple Object Access Protocol). However, in the current versions of the SOAP standard, this is no longer the case. For the detailed SOAP specifications, surf to http:// www.w3.org/TR/soap.

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new PropertyChangedCallback(FrameworkElementOnTransformDirty)), new ValidateValueCallback(FrameworkElementIsWidthHeightValid)); The first argument to DependencyPropertyRegister() is the name of the normal CLR property on the class (Height in this case), while the second argument is the type information of the underlying data type it is encapsulating (a double) The third argument specifies the type information of the class that this property belongs to (FrameworkElement in this case) While this might seem redundant (after all, the HeightProperty field is already defined within the FrameworkElement class), this is a very clever aspect of WPF in that it allows one class to register properties on another (even if the class definition has been sealed!) The fourth argument passed to DependencyPropertyRegister() in this example is what really gives dependency properties their own unique flavor.

Essentially, .NET web services use two types of SOAP messages. The client sends a request message to a web service to trigger a web method. When processing is complete, the web service sends back a response message. Both of these messages have the same format, which is shown in Figure 32-2.

Here a FrameworkPropertyMetadata object is passed that describes various details regarding how WPF should handle this property with respect to callback notifications (if the property needs to notify others when the value changes) and various options (represented by the FrameworkPropertyMetadataOptions enum) that control what is effected by the property in question (Does it work with data binding , Can it be inherited , etc) In this case, the constructor arguments of FrameworkPropertyMetadata break down as so: new FrameworkPropertyMetadata( // Default value of property (double)00, // Metadata options FrameworkPropertyMetadataOptionsAffectsMeasure, // Delegate pointing to method called when property changes new PropertyChangedCallback(FrameworkElementOnTransformDirty) ) Because the final argument to the FrameworkPropertyMetadata constructor is a delegate, note that its constructor parameter is pointing to a static method on the FrameworkElement class named OnTransformDirty().

[Bindable] private var message : String; public function init() : void { var myButton : ButtonJoker = new ButtonJoker(); myButton.label = "Click Me!"; myButton.addEventListener (ButtonMoveEvent.BUTTON_MOVE_EVENT,buttonMoveHandler); this.addChild(myButton); } public function buttonMoveHandler(event : ButtonMoveEvent) : void { message = "The button has moved to "+ event.direction; } ]]> </mx:Script> </mx:Application>

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