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Sorting is implemented in a very similar way to grouping, and, in much the same way, you can specify multiple criteria to sort by and they will be applied in the given order. Listing 4 12 demonstrates how to sort the aforementioned appointments list, first by location and then by attendee surname. Listing 4 12. Sorting a CollectionViewSource public CollectionViewSource AppointmentsByDate { get { CollectionViewSource appointmentsByDate = new CollectionViewSource(); appointmentsByDate.Source = appointments; appointmentsByDate.SortDescriptions.Add(new SortDescription("Location", ListSortDirection.Ascending)); appointmentsByDate.SortDescriptions.Add(new SortDescription("AttendeeSurname", ListSortDirection.Descending)); return appointmentsByDate; } } Notice that each SortDescription accepts a ListSortDirection enum value, which specificies whether the sort is Ascending or Descending. The underlying property must implement IComparable in order to be sortable.

Another useful technique is to place controls directly inside a template. For example, Figure 20-12 shows a list of categories. Next to each category is a View button that you can use to launch another window with just the matching products in that category.

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The trick in this example is handling the button clicks Obviously, all of the buttons will be linked to the same event handler, which you define inside the template However, you need to determine which item was clicked from the list One solution is to store some extra identifying information in the Tag property of the button, as shown here: <DataTemplate> <Grid Margin="3"> <GridColumnDefinitions> <ColumnDefinition></ColumnDefinition> <ColumnDefinition Width="Auto"></ColumnDefinition> </GridColumnDefinitions> <TextBlock Text="{Binding Path=CategoryName}"></TextBlock> <Button GridColumn="2" HorizontalAlignment="Right" Padding="2" Click="cmdView_Clicked" Tag="{Binding Path=CategoryID}">View ..</Button> </Grid> </DataTemplate> You can then retrieve the Tag property in the cmdView_Clicked event handler: private void cmdView_Clicked(object sender, RoutedEventArgs e) { Button cmd = (Button)sender; int categoryID = (int)cmdTag; .. } You can use this information to take another action.

The following describes the Pamela Project: The Pamela Project is a grassroots organization dedicated to providing community support for both technical and non-technical web users and administrators who wish to use or deploy information card technologies. We hope to make it easier for people of all skill levels to understand and use this technology. Overall, the goal is to hasten adoption, lessen frustration, and improve the overall quality of information card relying party deployments on the Internet. http://pamelaproject.com The Pamela Project has been set up to do the following: Champion open source relying party code development and integration for information card technologies Foster evolutionary integration with existing web-based products and services Create and assist in architecting code that is user-friendly, secure, and ready for mass adoption (not just proof-of-concept) Support and encourage not just developers but also nontechnical end users and webmasters to deploy and use these technologies

For example, you might launch another window that shows products and pass the CategoryID value to that window, which can then use filtering to show only the products in that category (One easy way to implement filtering is with data views, as described in 21) If you want all the information about the selected data item, you can grab the entire data object by leaving out the Path property when you define the binding: <Button HorizontalAlignment="Right" Padding="1" Click="cmdView_Clicked" Tag="{Binding}">View ..</Button> Now your event handler will receive the Product object (if you re binding a collection of Products) If you re binding to a DataTable, you ll receive a DataRowView object instead, which you can use to retrieve all the field values exactly as you would with a DataRow object Passing the entire object has another advantage: it makes it easier to update the list selection.

In the current example, it s possible to click a button in any item, regardless of whether that item is currently selected This is potentially confusing, because the user could select one item and click the View button of another item When the user returns to the list window, the first item remains selected even though the second item was the one that was used by the previous operation To remove the possibility for confusion, it s a good idea to move the selection to the new list item when the View button is clicked, as shown here: Button cmd = (Button)sender; Product product = (Product)cmdTag; lstCategoriesSelectedItem = product;.

Another option is to show the View button only in a selected item. This technique involves modifying or replacing the template you re using in this list, which is described in the Templates and Selection section a bit later in this chapter.

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