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and when the Color property is set, the Red, Green, and Blue values are also updated: private static void OnColorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { Color newColor = (Color)e.NewValue; Color oldColor = (Color)e.OldValue; ColorPicker colorPicker = (ColorPicker)sender; colorPicker.Red = newColor.R; colorPicker.Green = newColor.G; colorPicker.Blue = newColor.B; } Despite its appearances, this code won t cause an infinite series of calls as each property tries to change the other. That s because WPF doesn t allow reentrancy in the property change callbacks. For example, if you change the Color property, the OnColorChanged() method will be triggered. The OnColorChanged() method will modify the Red, Green, and Blue properties, triggering the OnColorRGBChanged() callback three times (once for each property). However, the OnColorRBGChanged() will not trigger the OnColorChanged() method again.

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Tip It might occur to you to use the coercion callbacks discussed in 4 to deal with the color properties.

However, this approach isn t appropriate. Property coercion callbacks are designed for properties that are interrelated and may override or influence one another. They don t make sense for properties that expose the same data in different ways. If you used property coercion in this example, it would be possible to set different values in the Red, Green, and Blue properties and have that color information override the Color property. The behavior you really want is to set the Red, Green, and Blue properties and use that color information to permanently change the value of the Color property.

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As you can see, the two implementations serve very different purposes. There would be no need to include this behavior if it was not necessary to solve part of the domain problem. Conversely, both of these implementations may be required and could be aggregated into one class. It is critical that only classes or methods that are directly addressing the problem at hand are implemented.

You might also want to add routed events that can be used to notify the control consumer when something happens. In the color picker example, it s useful to have an event that fires when the color is changed. Although you could define this event as an ordinary .NET event, using a routed event allows you to provide event bubbling and tunneling, so the event can be handled in a higher-level parent, such as the containing window. As with the dependency properties, the first step to defining a routed event is to create a static property for it, with the word Event added to the end of the event name: public static readonly RoutedEvent ColorChangedEvent; You can then register the event in the static constructor. At this point you specify the event name, the routing strategy, the signature, and the owning class: ColorChangedEvent = EventManager.RegisterRoutedEvent( "ColorChanged", RoutingStrategy.Bubble, typeof(RoutedPropertyChangedEventHandler<Color>), typeof(ColorPicker));

Rather than going to the work of creating a new delegate for your event signature, you can sometimes reuse existing delegates. The two useful delegates are RoutedEventHandler (for a routed event that doesn t pass along any extra information) and RoutedPropertyChangedEventHandler (for a routed event that provides the old and new values after a property has been changed). The RoutedPropertyChangedEventHandler, which is used in the previous example, is a generic delegate that s parameterized by type. As a result, you can use it with any property data type without sacrificing type safety. Once you ve defined and registered the event, you need to create a standard .NET event wrapper that exposes your event. This event wrapper can be used to attach (and remove) event listeners: public event RoutedPropertyChangedEventHandler<Color> ColorChanged { add { AddHandler(ColorChangedEvent, value); } remove { RemoveHandler(ColorChangedEvent, value); } } The final detail is the code that raises the event at the appropriate time. This code must call the RaiseEvent() method that s inherited from the base DependencyObject class. In the color picker example, you simply need to add these lines of code to the end of the OnColorChanged() method: Color oldColor = (Color)e.OldValue; RoutedPropertyChangedEventArgs<Color> args = new RoutedPropertyChangedEventArgs<Color>(oldColor, newColor); args.RoutedEvent = ColorPicker.ColorChangedEvent; colorPicker.RaiseEvent(args); Remember, the OnColorChanged() callback is triggered whenever the Color property is modified, either directly or by modifying the Red, Green, and Blue color components.

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