How to enable UI virtualization in Standard WPF ListView

Question

I'm using .NET 4.5/VS2012, and I have a ListView looks something like this

<ListView 
    VirtualizingPanel.IsContainerVirtualizable="True"
    VirtualizingPanel.IsVirtualizing="True"
    VirtualizingPanel.IsVirtualizingWhenGrouping="True"
    Grid.Row="1"
    Name="eventLogList"
    Margin="5,0,5,0"
    BorderBrush="Black"
    BorderThickness="2"
    ItemsSource="{Binding EventLogs}"
    SelectedItem="{Binding SelectedEventLog}"
    local:ListViewSorter.CustomListViewSorter="EventLogViewer.UI.EventLogItemComparer"
    SelectionMode="Single">

    <ListView.GroupStyle>
        <GroupStyle HidesIfEmpty="False">
            <GroupStyle.ContainerStyle>
                <Style TargetType="GroupItem">
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="GroupItem">
                                <Expander IsExpanded="True">
                                    <Expander.Header>
                                        <TextBlock FontSize="20" TextWrapping="Wrap" Margin="0,10,0,5" >
                                        <Bold><TextBlock Text="{Binding Name}"/></Bold> - <TextBlock FontSize="20" Text="{Binding ItemCount}"/> logs
                                    </TextBlock>
                                    </Expander.Header>
                                    <ItemsPresenter/>
                                </Expander>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </GroupStyle.ContainerStyle>
        </GroupStyle>
    </ListView.GroupStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn 
                Header="event id"
                Width="120"
                DisplayMemberBinding="{Binding EventID}" />
            <GridViewColumn 
                Header="level"
                Width="160"
                DisplayMemberBinding="{Binding Level}" />
            <GridViewColumn 
                Header="server" 
                Width="160"
                DisplayMemberBinding="{Binding Server}" />
            <GridViewColumn 
                Header="log name" 
                Width="160"
                DisplayMemberBinding="{Binding LogName}" />
            <GridViewColumn 
                Header="source"
                Width="240"
                DisplayMemberBinding="{Binding Source}" />
            <GridViewColumn 
                Header="logged"
                Width="240"
                DisplayMemberBinding="{Binding Logged}" />
        </GridView>
    </ListView.View>
</ListView>

But still the performance is not improving at all. I found an example using ListBox, but how to virtualize a ListView? I struggled quite a bit. I heard that with grouping, the virtualization is turned off in previous version of WPF, but with .NET 4.5, WPF has a IsVirtualizingWhenGrouping property, I already set it to True.

Update: The culprit is custom styling, after removing it, the list view runs smoothly like butter

Answer 1

This article will help you a lot.Also can see..

• ListView UI virtualization
• WPF Data virtualizing ListView

Answer 2

"UI virtualization stores only visible items in memory but in a data-binding scenario stores the entire data structure in memory. In contrast, data virtualization stores only the data items that are visible on the screen in memory."

"By default, UI virtualization is enabled for the ListView and ListBox controls when their list items are bound to data."

For more info view the original MSDN source.