c# - 未虚拟化项目时与 UI 的交互缓慢
问题描述
我们有一个相当大的 Dashboard WPF 应用程序，它使用 ListView/Gridview 解决方案来显示以单元格表示的大约 400 个项目。
每个单元格都有一个带有 ContentTemplateSelector 的 ContentControl，它根据绑定数据对象上的属性更改模板。
早些时候我们使用普通的 ListView 虚拟化，但我的用户抱怨滚动体验很差，我同意。
当我们通过启用 som 分组或手动停用虚拟化来停用虚拟化时，滚动变得像等效的 Excel 表格一样平滑（这是我们正在构建的应用程序要替换的内容）。但是我们在数据模板中的交互变得非常缓慢。这意味着当我们例如在模板中使用上下文菜单并用户右键单击时，上下文菜单出现需要 2-3 秒。与单击模板中的超链接相同。在发生某些事情之前需要 2-3 秒。
你们有关于如何调试这个的任何提示吗？
附件是仪表板的图片：
单元格中项目最常用的数据模板示例：
<Grid DataContext="{Binding DtoParent, ElementName=userControl}" d:DataContext="{Binding DtoParent,Source={StaticResource ucVm}}" >
<Grid.ContextMenu>
<ContextMenu>
<MenuItem Header="test"/>
</ContextMenu>
</Grid.ContextMenu>
<Grid DataContext="{Binding Objekt}">
<ScrollViewer ScrollChanged="dataTemplatePresentasjonKampanjeDetalj_ScrollViewer_ScrollChanged" PreviewMouseWheel="dataTemplatePresentasjonKampanjeDetalj_ScrollViewer_PreviewMouseWheel">
<Border BorderBrush="DarkGray" BorderThickness="1" Padding="2" CornerRadius="5" MouseMove="Border_MouseMove" PreviewMouseDown="Border_PreviewMouseDown" Tag="{Binding}">
<Grid>
<Grid.ContextMenu>
<ContextMenu>
<MenuItem Header="Kopier hele kampanjedetaljen" x:Name="miKampanjeDetaljCopy" Click="miKampanjeDetaljCopy_Click" Tag="{Binding}" />
<MenuItem Header="Lim inn varegruppe" x:Name="miLimInnVareGruppe" Click="miLimInnVareGruppe_Click" Tag="{Binding}">
<MenuItem.Style>
<Style TargetType="MenuItem" BasedOn="{StaticResource {x:Type MenuItem}}">
<Setter Property="IsEnabled" Value="True" />
<Style.Triggers>
<DataTrigger Binding="{Binding DtoVersjonKampanje.Låst}" Value="True">
<Setter Property="IsEnabled" Value="False" />
</DataTrigger>
</Style.Triggers>
</Style>
</MenuItem.Style>
</MenuItem>
</ContextMenu>
</Grid.ContextMenu>
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.Style>
<Style TargetType="Grid">
<Style.Triggers>
<DataTrigger Binding="{Binding DtoVersjonKampanjeDetalj.ErEkaFerdig}" Value="True">
<Setter Property="Background" Value="LightGreen" />
</DataTrigger>
</Style.Triggers>
</Style>
</Grid.Style>
<StackPanel Orientation="Horizontal">
<Viewbox Width="16" Height="16" Visibility="{Binding DtoVersjonElement.KunNett, Converter={StaticResource booleanToVisibilityConverter}}" ToolTip="Gjelder kun for Nettapotek">
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</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Rectangle.Fill>
</Rectangle>
</Viewbox>
<customControls:ccAntallProdukterVisning ToolTip="Antall produkter" />
<!--<Button Content="{Binding DtoVersjonKampanjeDetalj.Tittel}"/>-->
</StackPanel>
<ItemsControl ItemsSource="{Binding ObsCollVareTittelVisning}" VerticalAlignment="Stretch" Grid.Row="1" Grid.Column="0" VirtualizingPanel.IsVirtualizing="False"
HorizontalAlignment="Stretch" Margin="4" ItemTemplate="{StaticResource dataTemplateVareTittelVisningeHyperLink}">
</ItemsControl>
<Image Source="/WpfVFAKampanjeMaster;component/Assets/lock.png" Height="20" ToolTip="Denne kampanjen er låst for redigering"
VerticalAlignment="Top" HorizontalAlignment="Right">
<Image.Style>
<Style TargetType="Image">
<Setter Property="Visibility" Value="Collapsed" />
<Style.Triggers>
<DataTrigger Binding="{Binding DtoVersjonKampanje.Låst}" Value="True">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</Image.Style>
</Image>
</Grid>
</Border>
</ScrollViewer>
</Grid>
<DataTemplate x:Key="dataTemplateVareTittelVisningeHyperLink" DataType="presentasjon:DtoKampanjeDetaljVareTittelVisning">
<TextBlock Margin="4,0">
<TextBlock.ContextMenu>
<ContextMenu>
<MenuItem Header="Kopier varegruppe" x:Name="miKopierVareGruppe" Tag="{Binding}" Click="miKopierVareGruppe_Click" />
</ContextMenu>
</TextBlock.ContextMenu>
<Hyperlink Tag="{Binding}" x:Name="hyperLinkVareTittelVisning" Click="hyperLinkVareTittelVisning_Click">
<Hyperlink.ToolTip>
<ItemsControl ItemsSource="{Binding ObsCollTilbud}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Navn}" />
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Hyperlink.ToolTip>
<TextBlock MaxWidth="300" TextWrapping="Wrap">
<TextBlock Text="{Binding DtoVersjonKampanjeDetaljVareTittel.Tittel}" Foreground="{Binding DtoVersjonKampanjeDetaljVareTittel.Status,Converter={StaticResource EnumVaretittelForgrunnsFargeConverter}}" />
<customControls:ccVareTittelTilbudVisning ObsCollTilbud="{Binding ObsCollTilbud}" Margin="-0,0,0,-3" />
</TextBlock>
</Hyperlink>
</TextBlock>
</DataTemplate>
解决方案
好的，需要进行很多更改才能获得性能。
现在我们已经接近可接受的性能。
1.删除所有带有超链接的TextBlock。
2.从UserControl更改为CustomControl
3.真正有很大不同的一个：
public class CustomListView : ListView
{
protected override void OnIsKeyboardFocusWithinChanged(DependencyPropertyChangedEventArgs e)
{
//huge performance hit if next line is not commented out
//base.OnIsKeyboardFocusWithinChanged(e);
}
}
我们实际上以大约 45 秒的初始加载时间结束。但是由于我们有一个初始加载的进度窗口，这应该是可以接受的。
但是现在该应用程序在初始加载后非常灵敏且响应迅速。
当我们使用 WCF 服务器的回调合约将所有增量数据更改推送到所有连接的客户端时，它已成为一个非常好的仪表板应用程序。
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