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A better idea is to create a style selector that uses one or more properties to allow you to specify some of these details, such as the criteria you re using to evaluate your data items and the styles you want to use The following style selector is still quite simple but extremely flexible It s able to examine any data object, look for a given property, and compare that property against another value to choose between two styles The property, property value, and styles are all specified as properties The SelectStyle() method uses reflection to find the right property in a manner similar to the way data bindings work when digging out bound values.

Here s the complete code: public class SingleCriteriaHighlightStyleSelector : StyleSelector { public Style DefaultStyle { get; set; } public Style HighlightStyle { get; set; } public string PropertyToEvaluate { get; set; } public string PropertyValueToHighlight { get; set; } public override Style SelectStyle(object item, DependencyObject container) { Product product = (Product)item; // Use reflection to get the property to check Type type = productGetType(); PropertyInfo property = typeGetProperty(PropertyToEvaluate);.

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// Decide if this product should be highlighted // based on the property value. if (property.GetValue(product, null).ToString() == PropertyValueToHighlight) { return HighlightStyle; } else { return DefaultStyle; } } } To make this work, you ll need to create the two styles you want to use, and you ll need to create and initialize an instance of the SingleCriteriaHighlightStyleSelector. Here are two similar styles, which are distinguished only by the background color and the use of bold formatting: <Window.Resources> <Style x:Key="DefaultStyle" TargetType="{x:Type ListBoxItem}"> <Setter Property="Background" Value="LightYellow" /> <Setter Property="Padding" Value="2" /> </Style> <Style x:Key="HighlightStyle" TargetType="{x:Type ListBoxItem}"> <Setter Property="Background" Value="LightSteelBlue" /> <Setter Property="FontWeight" Value="Bold" /> <Setter Property="Padding" Value="2" /> </Style> </Window.Resources> When you create the SingleCriteriaHighlightStyleSelector, you point it to these two styles. You can also create the SingleCriteriaHighlightStyleSelector as a resource (which is useful if you want to reuse it in more than one place), or you can define it inline in your list control, as in this example: <ListBox Name="lstProducts" HorizontalContentAlignment="Stretch"> <ListBox.ItemContainerStyleSelector> <local:SingleCriteriaHighlightStyleSelector DefaultStyle="{StaticResource DefaultStyle}" HighlightStyle="{StaticResource HighlightStyle}" PropertyToEvaluate="CategoryName" PropertyValueToHighlight="Travel" > </local:SingleCriteriaHighlightStyleSelector> </ListBox.ItemContainerStyleSelector> </ListBox> Here, the SingleCriteriaHighlightStyleSelector looks for a Category property in the bound data item and uses the HighlightStyle if it contains the text Travel. Figure 20-9 shows the result.

The style selection process is performed once, when you first bind the list. This is a problem if you re displaying editable data and it s possible for an edit to move the data item from one style category to another. In this situation, you need to force WPF to reapply the styles, and there s no graceful way to do it. The brute-force approach is to remove the style selector by setting the ItemContainerStyleSelector property to null and then to reassign it: StyleSelector selector = lstProducts.ItemContainerStyleSelector; lstProducts.ItemContainerStyleSelector = null; lstProducts.ItemContainerStyleSelector = selector; You may choose to run this code automatically in response to certain changes by handling events such as PropertyChanged (which is raised by all classes that implement INotifyPropertyChanged, including Product), DataTable.RowChanged (if you re using the ADO.NET data objects), and, more generically, Binding.SourceUpdated (which fires only when Binding.NotifyOnSourceUpdated is true). When you reassign the style selector, WPF examines and updates every item in the list a process that s quick for small or medium-size lists.

Note The name Higgins has its origins in the name of a long-tailed mouse in Tasmania. The architects

Styles give you some basic formatting abilities, but they don t address the most significant limitation of the lists you ve seen so far: no matter how you tweak the ListBoxItem, it s only a ListBoxItem, not a more capable combination of elements. And because each ListBoxItem supports just a single bound field (as set through the DisplayMemberPath property), there s no room to make a rich list that incorporates multiple fields or images.

Note While there s a case for putting CollectionViewSource instances in the XAML markup, the fact that the filtering is provided by the Filter event means that we should implement this collection wrapper in the ViewModel. If we didn t, we d have to handle the event in the view s code behind, which we d like to avoid if possible.

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