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<StackPanel DataContext="{x:Static SystemFonts.IconFontFamily}"> <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily}, Path=Source}"></TextBlock> <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily}, Path=LineSpacing}"></TextBlock> <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily}, Path=FamilyTypefaces[0].Style}"></TextBlock> <TextBlock Text="{Binding Source={x:Static SystemFonts.IconFontFamily}, Path=FamilyTypefaces[0].Weight}"></TextBlock> </StackPanel> In this situation, it s cleaner and more flexible to define the binding source once using the FrameworkElement.DataContext property. In this example, it makes sense to set the DataContext property of the StackPanel that contains all the TextBlock elements. (You could also set the DataContext property at an even higher level for example, the entire window but it makes sense to define it as narrowly as possible to make your intentions clear.) You can set the DataContext property of an element in the same way that you set the Binding.Source property. In other words, you can supply your object inline, pull it out of a static property, or pull it out of a resource, as shown here: <StackPanel DataContext="{x:Static SystemFonts.IconFontFamily}"> Now you can streamline your binding expressions by leaving out the source information: <TextBlock Margin="5" Text="{Binding Path=Source}"></TextBlock> When the source information is missing from a binding expression, WPF checks the DataContext property of that element. If it s a null reference (Nothing), WPF searches up the element tree looking for the first data context that isn t null. (Initially, the DataContext property of all elements is null.) If it finds a data context, it uses that for the binding. If it doesn t, the binding expression doesn t apply any value to the target property.

s You can click in any window and the blue arrow will jump to that window. Then you can navigate the Tip

Not having an interface, though, does not make an application a service. Console applications can be written without an interface as well. Typically, services provide system-level support, including a system event log, performance counters, and a task scheduler, but again that does not make an application a service either.

s Note If you create a binding that explicitly specifies a source using the Source property, your element

This example shows you how you can create a basic binding to an object that isn t an element. However, to use this technique in a realistic application, you need to pick up a few more skills. In the next section, you ll learn how to display information drawn from a database by building on these data binding techniques.

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As mentioned previously, a Windows service is installed into the registry as an executable object. As you will see, the main() method does not actually run the service; instead, it is used to install the service into the registry. To actually start a Windows service, you will need to use either the Services application, which is part of the Administrative Tools on the Control Panel (see Figure 14-1), or create your own service control application. (You can also configure your Windows service to automatically start at startup as well.)

changes in each window (using the Next Change and the Previous Change buttons in the lower right).

When developers hear the term data binding, they often think of one specific application pulling information out of a database and showing it onscreen with little or no code. As you ve already seen, data binding in WPF is a much more general tool. Even if your application never comes into contact with a database, it s still likely to use data binding to

Figure 14-1. The Administrative Tools Services application In case you are interested, all Windows services installed on a computer can be found in the registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services There are several different types of Windows services that can be created, but only two managed code types can be created with the .NET Framework. A Windows service made up of only a single service in a process is of type Win32OwnProcess, while a Windows service made up of multiple services in a single shared process is of type Win32ShareProcess.

automate the way elements interact or translate an object model into a suitable display. However, you can learn a lot about the details of object binding by considering a traditional example that queries and updates a table in a database. But before you get there, you need to consider the custom data access component and data object that this example uses.

The exclamation mark tells you there is an unresolved conflict. Checking the Navigate conflicts only check box in the lower left corner of the dialog allows you to move between items that VSTS cannot figure out on its own. The only actual conflict that exists in the file is the boxed area (in the lower window) on line 10. The changes made in one file or another, but not both, are resolved automatically.

You can find out the type of Windows service you are accessing by querying the property ServiceController.ServiceType. If the service was not created by .NET, then it is possible for this property to have other values as listed in Table 14-1.

In professional applications, database code is not embedded in the code-behind class for a window but encapsulated in a dedicated class. For even better componentization, these data access classes can be pulled out of your application altogether and compiled in a separate DLL component. This is particularly true when writing code that accesses a database (because this code tends to be extremely performance-sensitive), but it s a good design no matter where your data lives.

s Note If Auto Merge was selected, this dialog box would still have been displayed because VSTS cannot

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