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Although a custom control should be as general purpose as possible, there are custom controls in which control logic involves execution of code that relies on other aspects of the consuming application. An example of this could be parts of the control code calling out to a web service or being reliant on the presence of another application object in memory. Keep in mind that when your control is loaded by Expression Blend, it is not running within the context of an application. In fact, application-dependent logic may actually cause exceptions that will result in Expression Blend failing to loading your control at design time. If you cannot avoid having that kind of logic in your control, you need to guard it so that it does not execute when the control is loaded in a designer. The best way to protect your application-dependent logic is to use the System.ComponentModel.DesignerProperties static class. The DesignerProperties.IsInDesignTool property returns true when the control is in design mode, and false otherwise. So when you want to execute control logic only if the control is being used outside the designer environment, you can conditionally execute that code only when DesignerProperties.IsInDesignTool is false.

Figure 5-5. There s Ardi. People who visit my profile can see a few of the pages I m a fan of and click the page titles to explore them. They can click the See All link to see the other pages I m a fan of as well.

Tip A common rule for choosing an advice type is to use the least powerful one that can satisfy your requirements.

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When Expression Blend loads your custom control to the design surface, it will execute the control constructor and your override for the OnApplyTemplate() method, if you have one. It will also execute any DependencyProperty change handlers that you may have associated with your DependencyProperty definitions when these properties are set for the first time (the default settings applied through the PropertyMetadata) or as they are set at design time through the property editor. These areas in your control code are where you should be especially careful to guard any code that might not execute successfully outside the context of an application.

Controls often get the data they display from runtime data bindings. ContentControl and ItemsControl types (and their derivatives) are great examples of this. However, at design time, for a user to visualize the changes that some of their property settings might make on the control s look and feel, it is beneficial to have the control show some sample data within the designer. You can easily supply this data in your code, but you need to make sure that this code executes only when the control is being used within a designer in effect, exactly the opposite behavior from that discussed in the previous section. The DesignerProperties.IsInDesignTool property can help here as well. With it, you can execute the code that adds sample data to your control at design time, only when the IsInDesignTool property is set to True. The following code shows the Content property of a custom ProgressBar control being set to some mock content at design time in both the OnApplyTemplate() override as the initial value and the DependencyProperty change handler for the CurrentValue property. In both cases, you guard the code to ensure that this code only executes within the designer like so: public override void OnApplyTemplate() { base.OnApplyTemplate(); //other code if (DesignerProperties.IsInDesignTool) { this.Content = string.Format("Progress {0}%", this.CurrentValue); } } internal static void OnCurrentValueChanged(DependencyObject Target, DependencyPropertyChangedEventArgs e) { ProgressBar pBar = Target as ProgressBar; //other code if (DesignerProperties.IsInDesignTool) { pBar.Content = string.Format("Progress {0}%", (double)e.NewValue); } } Figure 5-35 shows the state of the ProgressBar control with the sample data in the designer when the CurrentValue property is changed to 30.

The Creating Facebook Pages section later in this chapter provides an introduction to how to create a Facebook page as well as some options for promoting the page.

When writing AspectJ aspects, you can directly embed a pointcut expression in an advice annotation. However, the same pointcut expression may be repeated in multiple advices.

To illustrate these ideas, we show the application of the attributes and practices discussed on the sample ProgressBar control built in Recipe 5-10. Listing 5-42 shows the code for the control. Since there are no changes to the control template, the XAML is not listed here. To see the effects of this code, place this control on a XAML page within Expression Blend and play with the various custom properties in the property editor.

When you see ads on Facebook, they re usually pretty simple. They most often advertise a product or web site, but they may also advertise a Facebook page or group (see Figure 5-6).

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