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With this setting in place, it s easy to create code that automatically stores information about a window s size and position, as shown here: Properties.Settings.Default.WindowPosition = win.RestoreBounds; Properties.Settings.Default.Save(); Notice that this code uses the RestoreBounds property, which gives the correct dimensions (the last nonmaximized, nonminimized size), even if the window is currently maximized or minimized. (This handy feature wasn t directly available in Windows Forms, and it necessitated the use of the GetWindowPlacement() unmanaged API function.) It s just as easy to retrieve this information when you need it: try { Rect bounds = Properties.Settings.Default.WindowPosition; win.Top = bounds.Top; win.Left = bounds.Left; // Restore the size only for a manually sized // window. if (win.SizeToContent == SizeToContent.Manual) { win.Width = bounds.Width; win.Height = bounds.Height; } } catch { MessageBox.Show("No settings stored."); } The only limitation to this approach is that you need to create a separate property for each window that you want to store. If you need to store the position of many different windows, you might want to design a more flexible system. For example, the following helper class stores a position for any window you pass in, using a registry key that incorporates the name of that window. (You could use additional identifying information if you want to store the settings for several windows that will have the same name.) public class WindowPositionHelper { public static string RegPath = @"Software\MyApp\WindowBounds\"; public static void SaveSize(Window win) { // Create or retrieve a reference to a key where the settings // will be stored. RegistryKey key; key = Registry.CurrentUser.CreateSubKey(RegPath + win.Name); key.SetValue("Bounds", win.RestoreBounds.ToString()); key.SetValue("Bounds", win.RestoreBounds.ToString(CultureInfo.InvariantCulture)); }

public static void SetSize(Window win) { RegistryKey key; key = Registry.CurrentUser.OpenSubKey(RegPath + win.Name); if (key != null) { Rect bounds = Rect.Parse(key.GetValue("Bounds").ToString()); win.Top = bounds.Top; win.Left = bounds.Left; // Restore the size only for a manually sized // window. if (win.SizeToContent == SizeToContent.Manual) { win.Width = bounds.Width; win.Height = bounds.Height; } } } } To use this class in a window, you call the SaveSize() method when the window is closing and call the SetSize() method when the window is first opened. In each case, you pass a reference to the window you want the helper class to inspect. Note that in this example, each window must have a different value for its Name property.

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In 7, you considered the WPF application model, and you took your first look at how windows interact. As you saw there, the Application class provides you with two tools for getting access to other windows: the MainWindow and Windows properties. If you want to track windows in a more customized way for example, by keeping track of instances of a certain window class, which might represent documents you can add your own static properties to the Application class. Of course, getting a reference to another window is only half the battle. You also need to decide how to communicate. As a general rule, you should minimize the need for window interactions, because they complicate code unnecessarily. If you do need to modify a control in one window based on an action in another window, create a dedicated method in the target window. That makes sure the dependency is well identified, and it adds another layer of indirection, making it easier to accommodate changes to the window s interface.

Figure 1-2. The site at the other end of the link The email and site are part of a malicious attempt to gain the information to authenticate to my account on that site. If they managed to steal my identity with their fake site, they could then use my identity on the real one. With this identity, the thief could authenticate to the real site and be authorized to any funds I have in the account.

Tip If the two windows have a complex interaction, are developed or deployed separately, or are likely to

Controls in WPF and Silverlight expose events that can be subscribed to, just like Windows Forms and ASP.NET. The difference is in how these events are implemented and, consequently, how they behave. WPF and Silverlight do not use plain CLR events, but instead use routed events. The main reason for the different approach is so there can be multiple event subscribers within an element tree. Whereas CLR events directly invoke the handler on the event subscriber, routed events may be handled by any ancestor in the element tree. Listing 5 4. Declaring a Routed Event in WPF public static readonly RoutedEvent MyRoutedEvent = EventManager.RegisterRoutedEvent( "MyEvent", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(MyClass)); Listing 5 4 shows very clearly the difference in defining a routed event. The EventManager class is used as a factory for events, with the RegisterRoutedEvent method returning a RoutedEvent instance. However, there should be only one instance of each event per class, so it is stored in a static variable. The RegisterRoutedEvent method s signature is shown in Listing 5 5. Listing 5 5. The RegisterRoutedEvent Method Signature public static RoutedEvent RegisterRoutedEvent( string name, RoutingStrategy routingStrategy, Type handlerType, Type ownerType ) Here s a brief explanation:

change, you can consider going one step further and formalize their interaction by creating an interface with the public methods and implementing that interface in your window class.

Figures 23-3 and 23-4 show two examples for implementing this pattern. Figure 23-3 shows a window that triggers a second window to refresh its data in response to a button click. This window does not directly attempt to modify the second window s user interface; instead, it relies on a custom intermediate method called DoUpdate().

DoUpdate()

Note The payment provider the attacker is targeting here is just an example. I also get emails about my

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