ItemsControl.GroupStyle Property

Definition

Ruft eine Auflistung von GroupStyle-Objekten ab, die die Darstellung der einzelnen Gruppenebenen definieren.Gets a collection of GroupStyle objects that define the appearance of each level of groups.

public:
 property System::Collections::ObjectModel::ObservableCollection<System::Windows::Controls::GroupStyle ^> ^ GroupStyle { System::Collections::ObjectModel::ObservableCollection<System::Windows::Controls::GroupStyle ^> ^ get(); };
public System.Collections.ObjectModel.ObservableCollection<System.Windows.Controls.GroupStyle> GroupStyle { get; }
member this.GroupStyle : System.Collections.ObjectModel.ObservableCollection<System.Windows.Controls.GroupStyle>
Public ReadOnly Property GroupStyle As ObservableCollection(Of GroupStyle)

Property Value

ObservableCollection<GroupStyle>

Eine Auflistung von GroupStyle-Objekten, die die Darstellung der einzelnen Gruppenebenen definieren.A collection of GroupStyle objects that define the appearance of each level of groups.

Examples

Die folgenden Beispiele zeigen eine ItemsControl, die an eine XmlDataProvider gebunden ist, und den Code Behind-Inhalt, der die Logik zum Hinzufügen und Entfernen von Gruppierungen enthält.The following examples show an ItemsControl that is bound to an XmlDataProvider and the code-behind content that contains the logic to add and remove grouping. Wenn das Kontrollkästchen aktiviert ist, wird der Inhalt des ItemsControl nach dem Type Attribut gruppiert.When the check box is checked, the content of the ItemsControl is grouped by the Type attribute.

Jede Gruppe ist vom Typ CollectionViewGroup.Each group is of type CollectionViewGroup. Die GroupStyle HeaderTemplate wird so angegeben, dass Sie als TextBlock angezeigt wird, in dem die Name der einzelnen Gruppen angezeigt werden.The GroupStyle HeaderTemplate is specified so that it appears as a TextBlock that displays the Name of each the group. In diesem Fall ist die Name entweder Work oder Home.In this case, the Name is either Work or Home.

<Window x:Class="GroupingSample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Grouping Sample"
    Width="220" Height="550">
  <StackPanel>

    <StackPanel.Resources>
      <XmlDataProvider x:Key="myTasks" XPath="Tasks/Task">
        <x:XData>
          <Tasks xmlns="">
            <Task Name="Groceries" Priority="2" Type="Home">
              <Description>Pick up Groceries and Detergent</Description>
            </Task>
            <Task Name="Laundry" Priority="2" Type="Home">
              <Description>Do Laundry</Description>
            </Task>
            <Task Name="Email" Priority="1" Type="Work">
              <Description>Email Clients</Description>
            </Task>
            <Task Name="Clean" Priority="3" Type="Work">
              <Description>Clean my office</Description>
            </Task>
            <Task Name="Dinner" Priority="1" Type="Home">
              <Description>Get ready for family reunion</Description>
            </Task>
            <Task Name="Proposals" Priority="2" Type="Work">
              <Description>Review new budget proposals</Description>
            </Task>
          </Tasks>
        </x:XData>
      </XmlDataProvider>
    </StackPanel.Resources>

    <TextBlock Margin="12,5,5,0" FontSize="20" Text="My Task List"/>
    <CheckBox Margin="10,5,5,10" Checked="AddGrouping"
              Unchecked="RemoveGrouping">Group by task type</CheckBox>
    <ItemsControl Margin="10" Name="myItemsControl"
                  ItemsSource="{Binding Source={StaticResource myTasks}}">
      <ItemsControl.ItemTemplate>
        <DataTemplate>
          <DataTemplate.Resources>
            <Style TargetType="TextBlock">
              <Setter Property="FontSize" Value="18"/>
              <Setter Property="HorizontalAlignment" Value="Center"/>
            </Style>
          </DataTemplate.Resources>
          <Grid>
            <Ellipse Fill="Silver"/>
            <StackPanel>
              <TextBlock Margin="3,3,3,0"
                         Text="{Binding XPath=@Name}"/>
              <TextBlock Margin="3,0,3,7"
                         Text="{Binding XPath=@Priority}"/>
            </StackPanel>
          </Grid>
        </DataTemplate>
      </ItemsControl.ItemTemplate>
      <ItemsControl.ItemContainerStyle>
        <Style>
          <Setter Property="Control.Width" Value="100"/>
          <Setter Property="Control.Margin" Value="5"/>
        </Style>
      </ItemsControl.ItemContainerStyle>
      <ItemsControl.GroupStyle>
        <GroupStyle>
          <GroupStyle.HeaderTemplate>
            <DataTemplate>
              <TextBlock FontWeight="Bold" FontSize="15"
                         Text="{Binding Path=Name}"/>
            </DataTemplate>
          </GroupStyle.HeaderTemplate>
        </GroupStyle>
      </ItemsControl.GroupStyle>
    </ItemsControl>
  </StackPanel>
</Window>
using System;
using System.Windows;
using System.Windows.Data;

namespace GroupingSample
{
    public partial class Window1 : System.Windows.Window
    {

        public Window1()
        {
            InitializeComponent();
        }

        CollectionView myView;
        private void AddGrouping(object sender, RoutedEventArgs e)
        {
            myView = (CollectionView)CollectionViewSource.GetDefaultView(myItemsControl.ItemsSource);
            if (myView.CanGroup == true)
            {
                PropertyGroupDescription groupDescription
                    = new PropertyGroupDescription("@Type");
                myView.GroupDescriptions.Add(groupDescription);
            }
            else
            {
                return;
            }
        }

        private void RemoveGrouping(object sender, RoutedEventArgs e)
        {
            myView = (CollectionView)CollectionViewSource.GetDefaultView(myItemsControl.ItemsSource);
            myView.GroupDescriptions.Clear();
        }
    }
}

Imports System.Windows
Imports System.Windows.Data

Namespace GroupingSample
    Partial Public Class Window1
        Inherits System.Windows.Window

        Public Sub New()
            InitializeComponent()
        End Sub

        Private myView As CollectionView
        Private Sub AddGrouping(ByVal sender As Object, ByVal e As RoutedEventArgs)
            myView = CType(CollectionViewSource.GetDefaultView(myItemsControl.ItemsSource), CollectionView)
            If myView.CanGroup = True Then
                Dim groupDescription As New PropertyGroupDescription("@Type")
                myView.GroupDescriptions.Add(groupDescription)
            Else
                Return
            End If
        End Sub

        Private Sub RemoveGrouping(ByVal sender As Object, ByVal e As RoutedEventArgs)
            myView = CType(CollectionViewSource.GetDefaultView(myItemsControl.ItemsSource), CollectionView)
            myView.GroupDescriptions.Clear()
        End Sub
    End Class
End Namespace

Remarks

Der Eintrag bei Index 0 beschreibt die Gruppen der obersten Ebene. der Eintrag bei Index 1 beschreibt die nächste Ebene usw.The entry at index 0 describes the top-level groups, the entry at index 1 describes the next level, and so on. Wenn mehrere Gruppierungs Ebenen vorhanden sind als Einträge in der Auflistung, wird der letzte Eintrag für die zusätzlichen Ebenen verwendet.If there are more levels of grouping than entries in the collection, the last entry is used for the extra levels.

Verwendung von XAML-EigenschaftenelementenXAML Property Element Usage

<object>  
  <object.GroupStyle>  
    OneOrMoreGroupStyleObjects  
  </object.GroupStyle>  
</object>  
  

XAML-WerteXAML Values

OneormoregroupstyleobjectsOneOrMoreGroupStyleObjects
Mindestens ein GroupStyle-Objekt.One or more GroupStyle objects.

Applies to

See also