I've been search for a solution to a slow loading wpf form. It seems that virtualization should help me out, but I must be missing something.
I'm loading 35k orders and it takes 15 seconds to load. My guess is that virtualization isn't actually working for me.
<UserControl x:Class="IntTranWin.Modules.Orders.OrderSummary.OrdersSummaryView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300">
<ListView BorderThickness="0" Width="Auto" ItemsSource="{Binding Path=Orders.Items}" AlternationCount="2"
IsSynchronizedWithCurrentItem="True" VirtualizingStackPanel.IsVirtualizing="True"
VirtualizingStackPanel.VirtualizationMode="Recycling" ScrollViewer.IsDeferredScrollingEnabled="True">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.View>
<GridView AllowsColumnReorder="true" ColumnHeaderToolTip="Orders">
<GridViewColumn Header="Number" DisplayMemberBinding="{Binding Path=OrderNumber}" Width="65" />
</GridView>
</ListView.View>
</ListView>
</UserControl>
Thanks
shreesh chandra shukla
17-Aug-2013There wasn't really anything wrong with wpf I provided. The problem was in a styling of ScrollViewer for the GridView which disabled virtualization.
<Style x:Key="{x:Static GridView.GridViewScrollViewerStyleKey}" TargetType="{x:Type ScrollViewer}"><Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ScrollViewer}">
<Grid Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<DockPanel Margin="{TemplateBinding Padding}">
<ScrollViewer DockPanel.Dock="Top" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"
Focusable="false">
<Border CornerRadius="4" Background="{StaticResource DefaultedBorderBrush}" Padding="4" Margin="0,4,0,4">
<GridViewHeaderRowPresenter Margin="2,0,2,0"
Columns="{Binding Path=TemplatedParent.View.Columns,RelativeSource={RelativeSource TemplatedParent}}"
ColumnHeaderContainerStyle="{Binding Path=TemplatedParent.View.ColumnHeaderContainerStyle,RelativeSource={RelativeSource TemplatedParent}}"
ColumnHeaderTemplate="{Binding Path=TemplatedParent.View.ColumnHeaderTemplate,RelativeSource={RelativeSource TemplatedParent}}"
ColumnHeaderTemplateSelector="{Binding Path=TemplatedParent.View.ColumnHeaderTemplateSelector,RelativeSource={RelativeSource TemplatedParent}}"
AllowsColumnReorder="{Binding Path=TemplatedParent.View.AllowsColumnReorder,RelativeSource={RelativeSource TemplatedParent}}"
ColumnHeaderContextMenu="{Binding Path=TemplatedParent.View.ColumnHeaderContextMenu,RelativeSource={RelativeSource TemplatedParent}}"
ColumnHeaderToolTip="{Binding Path=TemplatedParent.View.ColumnHeaderToolTip,RelativeSource={RelativeSource TemplatedParent}}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Border>
</ScrollViewer>
<ScrollContentPresenter Name="PART_ScrollContentPresenter" KeyboardNavigation.DirectionalNavigation="Local" />
</DockPanel>
<ScrollBar Name="PART_HorizontalScrollBar" Orientation="Horizontal" Grid.Row="1"
Maximum="{TemplateBinding ScrollableWidth}" ViewportSize="{TemplateBinding ViewportWidth}"
Value="{TemplateBinding HorizontalOffset}" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" />
<ScrollBar Name="PART_VerticalScrollBar" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}"
ViewportSize="{TemplateBinding ViewportHeight}" Value="{TemplateBinding VerticalOffset}"
Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
I hope it will work fine.