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There s still one minor issue with this example. Right now the tag you ve added for your button specifies a Margin value of 10 and a Padding of 5. The StackPanel pays attention to the Margin property of the button, but the Padding property is ignored, leaving the contents of your button scrunched up against the sides. The problem here is that the Padding property doesn t have any effect unless you specifically heed it in your template. In other words, it s up to your template to retrieve the padding value and use it to insert some extra space around your content. Fortunately, WPF has a tool that s designed exactly for this purpose: template bindings. By using a template binding, your template can pull out a value from the control to which you re applying the template. In this example, you can use a template binding to retrieve the value of the Padding property and use it to create a margin around the ContentPresenter: <ControlTemplate x:Key="ButtonTemplate" TargetType="{x:Type Button}"> <Border BorderBrush="Orange" BorderThickness="3" CornerRadius="2" Background="Red" TextBlock.Foreground="White"> <ContentPresenterRecognizesAccessKey="True" Margin="{TemplateBinding Padding}"></ContentPresenter> </Border> </ControlTemplate> This achieves the desired effect of adding some space between the border and the content. Figure 17-6 shows your modest new button.

Template bindings are similar to ordinary data bindings, but they re lighter weight because they re specifically designed for use in a control template. They only support one-way data binding (in other words, they can pass information from the control to the template but not the other way around), and they can t be used to draw information from a property of a class that derives from Freezable. If you run into a situation where template bindings won t work, you can use a full-fledged data binding instead. 18 includes a sample color picker that runs into this problem and uses a combination of template bindings and regular bindings.

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Next you ll add the StateInformation service. This service will return information for a given U.S. state, such as population, website, governor, and time zone. 1. Right-click the project, and select Add Web Reference. 2. In the URL field, enter http://sdpws.strikeiron.com/sdpStateInformation WSDL, and click the Go button. 3. In the Web Reference Name field, change the name to StateInformation, as shown in Figure 15-4.

Figure 3 8. Extended Port Checker application, which checks the state of multiple ports The DataGrid shown lists a port number and the port s status in a CheckBox. The port s status is a three-state value: open (checked), closed (unchecked), and indeterminate (filled). We will see how the model provides this value later. As you can see, port 80 is currently closed on my machine which makes sense as I have a web server bound to that port. Listing 3 5 displays the XAML code for this window. There is nothing particularly remarkable about this code; it is fairly self-explanatory. It is sufficient to note that the Is Open column is bound only one way because this field is read-only. We cannot uncheck a port to close it or check a port to open it. Listing 3 5. XAML Code for the Port Checker <Window x:Class="PortChecker.View.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Port Checker" Height="350" Width="525"> <DockPanel> <StackPanel Orientation="Horizontal" DockPanel.Dock="Top"> <Label Content="Machine Name / IP Address:" /> <TextBox Width="200" Name="machineNameOrIpAddress" /> <Button Content="Check Ports" Click="CheckPortsClick" /> </StackPanel> <DataGrid Name="ports" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTextColumn Header="Port Number" Binding="{Binding Number}" /> <DataGridCheckBoxColumn Header="Is Open " Binding="{Binding Mode=OneWay, Path=IsOpen}" IsReadOnly="True" IsThreeState="True" /> </DataGrid.Columns>

Note Template bindings support the WPF change-monitoring infrastructure that s built into all dependency

properties. That means that if you modify a property in a control, the template takes it into account automatically. This detail is particularly useful when you re using animations that change a property value repeatedly in a short space of time.

The only way you can anticipate what template bindings are needed is to check the default control template. If you look at the control template for the Button class, you ll find that it uses a template binding in exactly the same way as this custom template it takes the padding specified on the button and converts it to a margin around the ContentPresenter. You ll also find that the standard button template includes a few more template bindings that aren t used in the simple customized template, such as HorizontalAlignment, VerticalAlignment, and Background. That means if you set these properties on the button, they ll have no effect on the simple custom template.

ContentPresenter.Content property to the Button.Content property. However, this binding is implicit, so you don t need to add it yourself.

The next service you ll add will be the SenatorInformation service. This service will return senator information for a given U.S. state, including senator name, party, and office contact information. 1. Right-click the project, and select Add Web Reference. 2. In the URL field, enter http://sdpws.strikeiron.com/sdpUSSenators WSDL, and click the Go button. 3. In the Web Reference Name field, change the name to SenatorInformation, as shown in Figure 15-5. 4. Click Add Reference.

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