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The next service you ll add will be the CensusInformationForZipCode service. For a given ZIP code, this service will return a wealth of data collected during the U.S. Census. 1. Right-click the project, and select Add Web Reference. 2. In the URL field, enter http://sdpws.strikeiron.com/sdpCensus WSDL, and click the Go button. 3. In the Web Reference Name field, change the name to CensusInformationForZipCode, as shown in Figure 15-8. 4. Click Add Reference.

As you learned in 11, triggers aren t limited to setting properties. You can also use event triggers to run animations when specific properties change. At first glance, this may seem like a frill, but it s actually a key ingredient in all but the simplest WPF controls. For example, consider the button you ve studied so far. Currently, it switches instantaneously from one color to another when the mouse mover overtop. However, a more modern button might use a very brief animation to blend from one color to the other, which creates a subtle but refined effect. Similarly, the button might use an animation to change the opacity of the focus cue rectangle, fading it quickly into view when the button gains focus rather than showing it in one step. In other words, event triggers allow controls to change from one state to another more gradually and more gracefully, which gives them that extra bit of polish. Here s a revamped button template that uses triggers to make the button color pulse (shift continuously between red and blue) when the mouse is over it. When the mouse moves away, the button background returns to its normal color using a separate one-second animation: <ControlTemplate x:Key="ButtonTemplate" TargetType="{x:Type Button}"> <Border BorderBrush="Orange" BorderThickness="3" CornerRadius="2" Background="Red" TextBlock.Foreground="White" Name="Border"> <Grid> <Rectangle Name="FocusCue" Visibility="Hidden" Stroke="Black" StrokeThickness="1" StrokeDashArray="1 2" SnapsToDevicePixels="True" ></Rectangle> <ContentPresenter RecognizesAccessKey="True" Margin="{TemplateBinding Padding}"></ContentPresenter> </Grid> </Border> <ControlTemplate.Triggers> <EventTrigger RoutedEvent="MouseEnter"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="Border" Storyboard.TargetProperty="Background.Color" To="Blue" Duration="0:0:1" AutoReverse="True" RepeatBehavior="Forever"></ColorAnimation> </Storyboard> </BeginStoryboard> </EventTrigger> <EventTrigger RoutedEvent="MouseLeave"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="Border"

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Storyboard.TargetProperty="Background.Color" Duration="0:0:0.5"></ColorAnimation> </Storyboard> </BeginStoryboard> </EventTrigger> </ControlTemplate.Triggers> </ControlTemplate> You can add the mouseover animation in two equivalent ways by creating an event trigger that responds to the MouseEnter and MouseLeave events (as demonstrated here) or by creating a property trigger that adds enter and exit actions when the IsMouseOver property changes. This example uses two ColorAnimation objects to change the button. Here are some other tasks you might want to perform with an EventTrigger-driven animation: x x

if (!IPAddress.TryParse(machineNameOrIPAddress, out ipAddress)) { // assume machine name IPHostEntry hostEntry = Dns.GetHostEntry(machineNameOrIPAddress); if (hostEntry.AddressList.Count() > 0) { ipAddress = hostEntry.AddressList[0]; } } for (int currentPort = 1; currentPort <= 100; ++currentPort) { TestPort(currentPort); } } private void TestPort(int currentPort) { Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { socket.Connect(ipAddress, currentPort); if (socket.Connected) { Ports.Add(new Port(currentPort, false)); } } catch (SocketException ex) { Ports.Add(new Port(currentPort, ex.SocketErrorCode == SocketError.ConnectionRefused)); } catch (Exception) { Ports.Add(new Port(currentPort, null)); } finally { socket.Close(); } } private IPAddress ipAddress; } } The PortChecker is rather limited. It is hardcoded to scan only the first hundred ports, it sets the port to an indeterminate state if there is an exception that it does not recognize, and it only performs minimal validation on the user s input. However, all of these details are self contained and can be changed without touching the view code. As long as the PortChecker s public interface remains constant, any changes can be made to this code without breaking the view. This is where most WPF and Silverlight examples end: with a model and a view separated into two parts. The model, as in this example, makes use of the ObservableCollection or

Show or hide an element. To do this, you need to change the Opacity property of an element in the control template. Change the shape or position. You can use a TranslateTransform to tweak the positioning of an element (for example, offsetting it slightly to give the impression that the button has been pressed). You can use a ScaleTransform or a RotateTransform to twiddle the element s appearance slightly as the user moves the mouse over it. Change the lighting or coloration. To do this, you need an animation that acts on the brush that you use to paint the background. You can use a ColorAnimation to change colors in a SolidBrush, but more advanced effects are possible by animating more complex brushes. For example, you can change one of the colors in a LinearGradientBrush (which is what the default button control template does), or you can shift the center point of a RadialGradientBrush.

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