Group Data in a Collection : ItemsControl « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. ItemsControl

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:WpfApplication1="clr-namespace:WpfApplication1"
     Title="WPF" Height="294" Width="160">
    <Window.Resources>
        <WpfApplication1:Countries x:Key="countries"/>
        <CollectionViewSource x:Key="cvs" Source="{Binding Source={StaticResource countries}}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="Continent"/>
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
        <DataTemplate x:Key="groupingHeaderTemplate">
            <Label VerticalAlignment="Center" Content="{Binding}" ></Label>
        </DataTemplate>
    </Window.Resources>

    <Grid>
        <ItemsControl ItemsSource="{Binding Source={StaticResource cvs}}" DisplayMemberPath="Name">
            <ItemsControl.GroupStyle>
                <GroupStyle HeaderTemplate= "{StaticResource groupingHeaderTemplate}" />
            </ItemsControl.GroupStyle>
        </ItemsControl>
    </Grid>
</Window>
//File:Window.xaml.vb
Imports System.Collections.ObjectModel

Namespace WpfApplication1
  Public Class Country
    Private m_name As String
    Private m_continent As Continent

    Public Sub New(name As String, continent As Continent)
      Me.m_name = name
      Me.m_continent = continent
    End Sub

    Public Property Name() As String
      Get
        Return m_name
      End Get
      Set
        m_name = value
      End Set
    End Property

    Public Property Continent() As Continent
      Get
        Return m_continent
      End Get
      Set
        m_continent = value
      End Set
    End Property
  End Class

  Public Enum Continent
    Europe
    NorthAmerica
  End Enum

  Public Class Countries
    Inherits Collection(Of Country)
    Public Sub New()
      Me.Add(New Country("Great Britan", Continent.Europe))
      Me.Add(New Country("USA", Continent.NorthAmerica))
      Me.Add(New Country("Canada", Continent.NorthAmerica))
    End Sub
  End Class
End Namespace

16.99.ItemsControl
	16.99.1.	Apply Custom Sorting Logic to a Collection
	16.99.2.	Bind an ItemsControl to the CollectionViewSource, Set its DisplayMemberPath to display the Name property
	16.99.3.	Sort Data in a Collection
	16.99.4.	Group Data in a Collection