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The SetStateActivity is usually declared as a child of an EventDrivenActivity. The EventDrivenActivity is used within a StateActivity to wait for an external event. The event triggers additional processing within that state. After executing other activities to perform some real work, the SetStateActivity is usually included to transition to the next state. When it is used, the SetStateActivity must be declared as the last activity in a series of activities. Placing it somewhere in the middle of a long sequence of activities is not valid.

on top of the main window that creates them. You ll learn more about the Owner property when you consider windows in detail in 8.

if (this.Visible == true) { //Check to see whether the user submitted an information card string xmlToken; xmlToken = Request.Params["xmlLoginToken"]; if (xmlToken == null || xmlToken == "") { } else { //The user submitted an information card, //so process it. SignInWithInformationCard(xmlToken); }

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Now you can use that collection elsewhere in your code to loop over all the documents and use public members. In this case, the Document class includes a custom SetContent() method that updates its display: Private Sub cmdUpdate_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) Dim app As ApplicationCore = CType(Application.Current, ApplicationCore) For Each doc As Document In app.Documents doc.SetContent("Refreshed at " & DateTime.Now.ToLongTimeString() & ".") Next End Sub Figure 3-1 demonstrates this application. The actual end result isn t terribly impressive, but the interaction is worth noting it demonstrates a safe, disciplined way for your windows to interact through a custom application class. It s superior to using the Windows property, because it s strongly typed, and it holds only Document windows (not a collection of all the windows in your application). It also gives you the ability to categorize the windows in another, more useful way for example, in a Dictionary collection with a key name for easy lookup. In a document-based application, you might choose to index windows in a collection by file name.

The StateInitializationActivity is an optional activity that contains activities to execute when a state is first entered. You can declare a maximum of one StateInitializationActivity in a StateActivity. Each time the workflow transitions to the state, the activities in the StateInitializationActivity are executed before any other activities.

s Note When interacting between windows, don t forget your object-oriented smarts always use a layer

StateFinalizationActivity is the reciprocal of StateInitializationActivity. It is a container for activities that you wish to execute just before you transition to another state. It is optional, but if you use it, there can be a maximum of one StateFinalizationActivity for a StateActivity.

of custom methods, properties, and events that you ve added to the window classes. Never expose the fields or controls of a form to other parts of your code. If you do, you ll quickly wind up with a tightly coupled interface where one window reaches deep into the inner workings of another, and you won t be able to enhance either class without breaking the murky interdependencies between them.

} } } 5. Add the btnSignIn_Click event, and populate it with the code listed here. This code utilizes the built-in functionality in the FormsAuthentication class to authenticate users via a username and password. void btnSignIn_Click(object sender, EventArgs e) { bool isAuthenticated = AuthenticateUser(tbUsername.Text, tbPassword.Text); if (isAuthenticated) { FormsAuthentication.RedirectFromLoginPage(tbUsername.Text, true); }

Ordinarily, you can launch as many copies of a WPF application as you want. In some scenarios, this design makes perfect sense. However, in other cases it s a problem, particularly when building document-based applications. For example, consider Microsoft Word. No matter how many documents you open (or how you open them), only a single instance of winword.exe is loaded at a time. As you open new documents, they appear in the new windows, but a single application remains in control of all the document windows. This design is the best approach if you want to reduce the overhead of your application, centralize certain features (for example, create a single print queue manager), or integrate disparate windows (for example, offer a feature that tiles all the currently open document windows next to each other).

The activities in this category are all related to event handling and work with other child activities that receive the event. The activities outlined here don t actually receive the events, but instead, they are containers for other event-driven activities.

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