我有一個ListBox是數據綁定到一個ObservableCollection和具有複雜ItemContainerStyle(含圖片,進度條和文本)當高度不固定時,CollectionView過濾器會凍結UI嗎?
當我嘗試在它的CollectionView應用過濾器,具有約200個項目的集合,該UI將凍結2-3秒。這隻發生在ListBox的高度不固定時(即允許增長)。當列表框高度設置爲一個值時即時,例如500
<Style x:Key="CollectionStyle" TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border x:Name="Bd" VerticalAlignment="Center" BorderBrush="Transparent" BorderThickness="1" CornerRadius="3.5" Margin="2" Padding="2">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Image Grid.Column="0" Source="{Binding Path=ListIcon}" Width="32" Margin="5,5,0,5" VerticalAlignment="Center" />
<Grid Grid.Column="1">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackPanel Orientation="Horizontal" Margin="10,0">
<TextBlock Text="{Binding Path=Name}" HorizontalAlignment="Stretch" VerticalAlignment="Center" Style="{StaticResource TextFontStyleTextBlock}" FontSize="14" TextTrimming="CharacterEllipsis" />
<TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Center" Text="{Binding Path=Time,UpdateSourceTrigger=PropertyChanged,Mode=OneWay}" Style="{StaticResource LabelFontStyleTextBlock}" TextTrimming="CharacterEllipsis" FontSize="12" Margin="5,0,0,0"/>
</StackPanel>
<ProgressBar Grid.Row="1" Height="10" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="10,0,10,0" Value="{Binding Percentage, Mode=OneWay, Converter={StaticResource doubleToProgress}}">
<ProgressBar.Foreground>
<MultiBinding Converter="{StaticResource ProgressBarColorConverter}">
<Binding Mode="OneWay" Path="Percentage" />
<Binding Mode="OneWay" Path="IsStatic" />
</MultiBinding>
</ProgressBar.Foreground>
</ProgressBar>
<StackPanel Orientation="Horizontal" Grid.Row="2" Margin="10,0,10,0">
<Image VerticalAlignment="Center" Visibility="{Binding IsStatic, Converter={StaticResource CollapsedIfFalse}, Mode=OneWay, FallbackValue=Collapsed}" Source="/Common;component/Images/alert.ico" Margin="2,2,2,2"
RenderOptions.BitmapScalingMode="HighQuality"
RenderOptions.EdgeMode="Aliased" />
<TextBlock HorizontalAlignment="Stretch" VerticalAlignment="Center" Text="{Binding Path=Description,Mode=OneWay}" Foreground="Gray" TextTrimming="CharacterEllipsis" FontSize="11"/>
</StackPanel>
</Grid>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<ListBox Grid.Row="0" x:Name="items" ItemsSource="{Binding Path=MyCollection}"
ItemContainerStyle="{StaticResource CollectionStyle}" />
有沒有辦法解決這個問題?在ListBox上固定高度不是可接受的結果,因爲它會導致垂直滾動條出現在已具有垂直滾動條的控件中