How to: Sort and Group Data Using a View in XAML
This example shows how to create a view of a data collection in Extensible Application Markup Language (XAML). Views allow for the functionalities of grouping, sorting, filtering, and the notion of a current item.
Example
In the following example, the static resource named places is defined as a collection of Place objects, in which each Place object is consisted of a city name and the state. The prefix src is mapped to the namespace where the data source Places is defined. The prefix scm maps to "clr-namespace:System.ComponentModel;assembly=WindowsBase"
and dat maps to "clr-namespace:System.Windows.Data;assembly=PresentationFramework"
.
The following example creates a view of the data collection that is sorted by the city name and grouped by the state.
<Window.Resources>
<src:Places x:Key="places"/>
<CollectionViewSource Source="{StaticResource places}" x:Key="cvs">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="CityName"/>
</CollectionViewSource.SortDescriptions>
<CollectionViewSource.GroupDescriptions>
<dat:PropertyGroupDescription PropertyName="State"/>
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
The view can then be a binding source, as in the following example:
<ListBox ItemsSource="{Binding Source={StaticResource cvs}}"
DisplayMemberPath="CityName" Name="lb">
<ListBox.GroupStyle>
<x:Static Member="GroupStyle.Default"/>
</ListBox.GroupStyle>
</ListBox>
For bindings to XML data defined in an XmlDataProvider resource, precede the XML name with an @ symbol.
<XmlDataProvider x:Key="myTasks" XPath="Tasks/Task">
<x:XData>
<Tasks xmlns="">
<Task Name="Groceries" Priority="2" Type="Home">
<CollectionViewSource x:Key="mySortedTasks"
Source="{StaticResource myTasks}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="@Priority" />
</CollectionViewSource.SortDescriptions>
<CollectionViewSource.GroupDescriptions>
<dat:PropertyGroupDescription PropertyName="@Priority" />
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
See also
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