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you have a property named Category (which returns a linked Category object) or CategoryID (which identifies the category with a unique ID number). You can still use grouping in these scenarios, but you ll need to add a value converter that examines the grouping information (such as the Category object or CategoryID property) and returns the correct category text to use for the group. You ll see how to use a value converter with grouping in the next example.

This example has one problem. Although your items will now be arranged into separate groups based on their categories, it s difficult to see that any grouping has been applied when you look at the list. In fact, the result is the same as if you simply sorted by category name. There s actually more taking place you just can t see it with the default settings. When you use grouping, your list creates a separate GroupItem object for each group, and it adds these GroupItem objects to the list. The GroupItem is a content control, so each GroupItem holds the appropriate container (like ListBoxItem objects) with your actual data. The secret to showing your groups is formatting the GroupItem element so it stands out. You could use a style that applies formatting to all the GroupItem objects in a list. However, you probably want more than just formatting for example, you might want to display a group header, which requires the help of a template. Fortunately, the ItemsControl class makes both tasks easy through its ItemsControl.GroupStyle property, which provides a collection of GroupStyle objects. Despite the name, GroupStyle class is not a style. It s simply a convenient package that wraps a few useful settings for configuring your GroupItem objects. Table 21-1 lists the properties of the GroupStyle class.

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Sets the style that s applied to the GroupItem that s generated for each group. Instead of using ContainerStyle, you can use ContainerStyleSelector to supply a class that chooses the right style to use, based on the group. Allows you to create a template for displaying content at the beginning of each group. Instead of using HeaderTemplate, you can use HeaderTemplateSelector to supply a class that chooses the right header template to use, based on the group. Allows you to change the template that s used to hold groups. For example, you could use a WrapPanel instead of the standard StackPanel to create a list that tiles groups from left to right and then down.

Yadis is an initiative focused on a metadata discovery protocol, with its goal to make LID and OpenID interoperable. When visiting a relying party, you would provide them with your identifier/URL. The relying party would then make an HTTP request that would either return a Yadis document or a pointer to a Yadis document. The Yadis document contains information about what type of ID this is (such as OpenID) and what services are available.

In this example, all you need is a header before each group. You can use this to create the effect shown in Figure 21-4.

To add a group header, you need to set the GroupStyle.HeaderTemplate. You can fill this property with an ordinary data template, like the ones you saw in 20. You can use any combination of elements and data binding expressions inside your template. However, there s one trick. When you write your binding expression, you aren t binding against the data object from your list (in this case, the Product object). Instead, you re binding against the PropertyGroupDescription object for that group. That means if you want to display the field value for that group (as shown in Figure 21-4), you need to bind the PropertyGroupDescription.Name property rather than Product.CategoryName. Here s the complete template: <ListBox Name="lstProducts" DisplayMemberPath="ModelName"> <ListBox.GroupStyle> <GroupStyle> <GroupStyle.HeaderTemplate> <DataTemplate> <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" " Foreground="White" Background="LightGreen" Margin="0,5,0,0" Padding="3"/> </DataTemplate> </GroupStyle.HeaderTemplate> </GroupStyle> </ListBox.GroupStyle> </ListBox>

Threading may allow bound tasks to remain functional and responsive, but this comes at a high price. Not only is it much more difficult to understand, the problems that multi-threaded applications introduce are extremely hard to debug. Developers are most comfortable when their code is executed in a predictable order without any odd inconsistencies. Threading means that code can be stopped at any time and run by a different thread before returning to the original thread to continue, which greatly complicates matters.

Tip The ListBox.GroupStyle property is actually a collection of GroupStyle objects. This allows you to add

multiple levels of grouping. To do so, you need to add more than one PropertyGroupDescription (in the order that you want your grouping and subgrouping applied) and then add a matching GroupStyle object to format each level.

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