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WPF doesn t provide a native solution for single-instance applications, but you can use several workarounds. The basic technique is to check whether another instance of your application is already running when the Application.Startup event fires. The simplest way to do this is to use a systemwide mutex (a synchronization object provided by the operating system that allows for interprocess communication). This approach is simple but limited most significantly, there s no way for the new instance of an application to communicate with the existing instance. This is a problem in a document-based application, because the new instance may need to tell the existing instance to open a specific document, if it s passed on the command line. (For example, when you double-click a .doc file in Windows Explorer and Word is already running, you expect Word to load the requested file.) This communication is more complex, and it s usually performed through remoting or Windows Communication Foundation (WCF). A proper implementation needs to include a way to discover the remoting server and use it to transfer command-line arguments. But the simplest approach, and the one that s currently recommended by the WPF team, is to use the built-in support that s provided in Windows Forms and tailored to Visual Basic applications. This approach handles the messy plumbing behind the scenes. So, how can you use a feature that s designed for Windows Forms to manage a WPF application Essentially, the old-style application class acts as a wrapper for your WPF application class. When your application is launched, you ll create the old-style application class, which will then create the WPF application class. The old-style application class handles the instance management, while the WPF application class handles the real application. Figure 3-2 shows how these parts interact.

The ListenActivity is a composite activity that contains two or more instances of EventDrivenActivity. Each EventDrivenActivity defines an execution branch that is waiting for a different event. The EventDrivenActivity is also a composite activity and contains its own set of child activities that are executed when the event is received. Only one EventDrivenActivity branch is ever executed. When one branch receives its event, the other branches are canceled. The relationship between these two activities is similar to the IfElseActivity and the IfElseBranchActivity discussed previously in the Flow Control section. Just like the IfElseActivity, the ListenActivity is the container for multiple branches, only one of which will ever execute. Like the IfElseBranchActivity, the EventDrivenActivity defines a single execution branch. The ListenActivity cannot be used in a state machine workflow. However, the EventDrivenActivity by itself is often used as a child of the StateActivity. It contains the activities to execute when an event is received and the workflow is in a particular state. The first child activity of an EventDrivenActivity must be one that implements the IEventActivity interface. This interface is used by the workflow runtime engine to notify an activity that an event has been received. This requirement is necessary since the first activity in an EventDrivenActivity is the one that starts the execution of the branch. It must have some way to receive notification of an event, and the IEventActivity is that mechanism. The standard activities that implement this interface are the HandleExternalEventActivity, WebServiceInputActivity, ReceiveActivity (introduced in .NET 3.5), and DelayActivity.

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Figure 3-2. Wrapping the WPF application with a WindowsFormsApplicationBase The first step to use this approach is to derive a custom class from the Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase class. This class provides three important members that you use for instance management: The IsSingleInstance property enables a single-instance application. You set this property to True in the constructor. The OnStartup() method is triggered when the application starts. You override this method and create the WPF application object at this point.

else { lblError.Text="The username and password pair provided was invalid."; } } bool AuthenticateUser(string username, string password) { return FormsAuthentication.Authenticate(username, password); } 6. Next, create the operation SignInWithInformationCard, as shown here. This calls the AuthenticateInformationCardUser operation and, if authenticated, redirects to the originally requested URL. void SignInWithInformationCard(string xmlToken) { RetrieveTokenClaims(xmlToken); bool isAuthenticated = AuthenticateInformationCardUser(xmlToken, _ppid, _email); if (isAuthenticated) { FormsAuthentication.RedirectFromLoginPage(_ givenName + " " + _surName, true); } else { lblError.Text = "The Information Card provided is not associated with an account."; }

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