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That way, you can bind directly to the CategoryName property in your template, as shown here: <Border Margin="5" BorderThickness="1" BorderBrush="SteelBlue" CornerRadius="4" Background= "{Binding Path=CategoryName, Converter={StaticResource CategoryToColorConverter}"> Like the trigger approach, the value converter approach also prevents you from making dramatic changes, such as replacing a portion of your template with something completely different However, it allows you to implement more sophisticated formatting logic Also, it allows you to base a single formatting property on several properties from the bound data object, if you use IMultiValueConverter interface instead of the ordinary IValueConverter..

The way filtering is implemented in the CollectionViewSource is the reason that it is included as part of the ViewModel, rather than being declared in the XAML markup of the view. The Filter property is an event that requires a FilterEventHandler delegate, which accepts a FilterEventArgs object. Subscribing to this event in the view s code-behind would result in ViewModel logic leaking into the view, something we are at great pains to avoid. Listing 4 14 continues our appointments example and shows only those appointments that are organized within the next month. Listing 4 13. Filtering a CollectionViewSource private void AppointmentsWithinTheNextMonth(object sender, FilterEventArgs e) { Appointment appointment = e.Item as Appointment; if(appointment) { e.Accepted = DateTime.Now.AddMonths(1) > appointment.Date; } } The FilterEventArgs contains the current Item in the list that is being tested against. If the current date plus a month is later than the appointment s Date, we accept this item and it will be included in the filtered list.

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Tip Value converters are a good choice if you might want to reuse your formatting logic with other templates.

Another, more powerful option is to give different items a completely different template. To do this, you need to create a class that derives from DataTemplateSelector. Template selectors work in the same way as the style selectors you considered earlier they examine the bound object and choose a suitable template using the logic you supply. Earlier, you saw how to build a style selector that searches for specific values and highlights them with a style. Here s the analogous template selector, which looks at a property (specified by PropertyToEvaluate) and returns the HighlightTemplate if the property matches a set value (specified by PropertyValueToHighlight) or the DefaultTemplate otherwise: public class SingleCriteriaHighlightTemplateSelector : DataTemplateSelector { public DataTemplate DefaultTemplate { get; set; }

This may sound somewhat familiar. Although Shibboleth uses a number of familiar concepts, the terminology is different. Table 4-1 compares the terms between Shibboleth and CardSpace.

public DataTemplate HighlightTemplate { get; set; } public string PropertyToEvaluate { get; set; } public string PropertyValueToHighlight { get; set; } public override DataTemplate SelectTemplate(object item, DependencyObject container) { Product product = (Product)item; // Use reflection to get the property to check. Type type = product.GetType(); PropertyInfo property = type.GetProperty(PropertyToEvaluate); // Decide if this product should be highlighted // based on the property value. if (property.GetValue(product, null).ToString() == PropertyValueToHighlight) { return HighlightTemplate; } else { return DefaultTemplate; } } } And here s the markup that creates the two templates and an instance of the SingleCriteriaHighlightTemplateSelector: <Window.Resources> <DataTemplate x:Key="DefaultTemplate"> <Border Margin="5" BorderThickness="1" BorderBrush="SteelBlue" CornerRadius="4"> <Grid Margin="3"> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions>

<TextBlock Text="{Binding Path=ModelNumber}"></TextBlock> <TextBlock Grid.Row="1" Text="{Binding Path=ModelName}"></TextBlock> </Grid> </Border> </DataTemplate> <DataTemplate x:Key="HighlightTemplate"> <Border Margin="5" BorderThickness="1" BorderBrush="SteelBlue" Background="LightYellow" CornerRadius="4"> <Grid Margin="3"> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <TextBlock FontWeight="Bold" Text="{Binding Path=ModelNumber}"></TextBlock> <TextBlock Grid.Row="1" FontWeight="Bold" Text="{Binding Path=ModelName}"></TextBlock> <TextBlock Grid.Row="2" FontStyle="Italic" HorizontalAlignment="Right"> *** Great for vacations ***</TextBlock> </Grid> </Border> </DataTemplate> </Window.Resources> And here s the markup that applies the template selector: <ListBox Name="lstProducts" HorizontalContentAlignment="Stretch"> <ListBox.ItemTemplateSelector> <local:SingleCriteriaHighlightTemplateSelector DefaultTemplate="{StaticResource DefaultTemplate}" HighlightTemplate="{StaticResource HighlightTemplate}" PropertyToEvaluate="CategoryName" PropertyValueToHighlight="Travel" > </local:SingleCriteriaHighlightTemplateSelector> </ListBox.ItemTemplateSelector> </ListBox> As you can see, template selectors are far more powerful than style selectors, because each template has the ability to show different elements arranged in a different layout. In this example, the HighlightTemplate adds a TextBlock with an extra line of text at the end (Figure 20-13).

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