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The goal of user controls is to provide a design surface that supplements the control template, giving you a quicker way to define the control at the price of future flexibility. This causes a problem if you re happy with the functionality of a user control, but you need to tailor its visual appearance. For example, imagine you want to use the same color picker but give it a different skin that blends better into an existing application window. You may be able to change some aspects of the user control through styles, but parts of it are locked away inside, hard-coded into the markup. For example, there s no way to move the preview rectangle to the left side of the sliders. The solution is to create a lookless control a control that derives from one of the control base classes but doesn t have a design surface. Instead, this control places its markup into a default template that can be replaced at will without disturbing the control logic.

Without a unit test, developers do not know that the code that they have written works. Sure, they might know that it compiles, which is certainly a start. But, they cannot be sure that the code that they have written works unless it is tested. With a unit test in place, you can verify that the code does exactly what was intended. The corollary to this is that code is only as good its unit tests if you have a bug in your unit test, and the test passes, there is likely to be a bug in the production code.

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Changing the color picker into a lookless control isn t too difficult. The first step is easy you simply need to change the class declaration, as shown here: public class ColorPicker : System.Windows.Controls.Control { ... } In this example, the ColorPicker class derives from Control. FrameworkElement isn t suitable, because the color picker does allow user interaction and the other higher-level classes don t accurately describe the color picker s behavior. For example, the color picker doesn t allow you to nest other content inside, so the ContentControl class isn t appropriate. The code inside the ColorPicker class is the same as the code for the user control (aside from the fact that you must remove the call to InitializeComponent() in the constructor). You follow the same approach to define dependency properties and routed events. The only difference is that you need to tell WPF that you will be providing a new style for your control class. This style will provide the new control template. (If you don t take this step, you ll continue whatever template is defined in the base class.) To tell WPF that you re providing a new style, you need to call the OverrideMetadata() method in the static constructor of your class. You call this method on the DefaultStyleKeyProperty, which is a dependency property that defines the default style for your control. The code you need is as follows: DefaultStyleKeyProperty.OverrideMetadata(typeof(ColorPicker), new FrameworkPropertyMetadata(typeof(ColorPicker))); You could supply a different type if you want to use the template of another control class, but you ll almost always create a specific style for each one of your custom controls.

Once you ve added the added the call to OverrideMetadata, you simply need to plug in the right style. This style needs to be placed in a resource dictionary named generic.xaml, which must be placed in a Themes subfolder in your project. That way, your style will be recognized as the default style for your control. Here s how to add the generic.xaml file: 1. 2. 3. 4. Right-click the class library project in the Solution Explorer, and choose Add New Folder. Name the new folder Themes. Right-click the Themes folder, and choose Add New Item. In the Add New Item dialog box, pick the XML file template, enter the name generic.xaml, and click Add.

Often, a custom control library has several controls. To keep their styles separate for easier editing, the generic.xaml file often uses resource dictionary merging. The following markup shows a generic.xaml file that pulls in the resources from the ColorPicker.xaml resource dictionary in the same Themes subfolder of a control library named CustomControls: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" > <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/CustomControls;component/themes/ColorPicker.xaml"> </ResourceDictionary> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> Your custom control style must use the TargetType attribute to attach itself to the color picker automatically. Here s the basic structure of the markup that appears in the ColorPicker.xaml file: <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:CustomControls"> <Style TargetType="{x:Type local:ColorPicker}"> ... </Style> </ResourceDictionary>

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