虛擬化ItemsControl？我有一個ItemsControl但是，它包含了我想要虛擬化的數據列表。VirtualizingStackPanel.IsVirtualizing="True"似乎不適用于ItemsControl.這是真的嗎？還是有其他我不知道的方法？為了進行測試，我使用了以下代碼塊：<ItemsControl ItemsSource="{Binding Path=AccountViews.Tables[0]}"
VirtualizingStackPanel.IsVirtualizing="True"><ItemsControl.ItemTemplate>
<DataTemplate>
<TextBlock Initialized="TextBlock_Initialized"
Margin="5,50,5,50" Text="{Binding Path=Name}" />
</DataTemplate></ItemsControl.ItemTemplate></ItemsControl>如果我更改ItemsControl轉到ListBox，我可以看到Initialized事件只運行幾次(巨大的邊距，所以我只需要看幾個記錄)，但是作為一個ItemsControl每個項目都會被初始化。我試過設置ItemsControlPanelTemplate轉到VirtualizingStackPanel但這似乎沒什么用。
3 回答
守候你守候我
TA貢獻1802條經驗 獲得超10個贊
其實不僅僅是ItemsPanelTemplate使用VirtualizingStackPanel..默認ControlTemplate為ItemsControl沒有ScrollViewer，這是虛擬化的關鍵。添加到默認控件模板中。ItemsControl(使用控件模板ListBox作為模板)給我們提供了以下內容：
<ItemsControl
????VirtualizingStackPanel.IsVirtualizing="True"
????ScrollViewer.CanContentScroll="True"
????ItemsSource="{Binding?Path=AccountViews.Tables[0]}">
????<ItemsControl.ItemTemplate>
????????<DataTemplate>
????????????<TextBlock
????????????????Initialized="TextBlock_Initialized"
????????????????Text="{Binding?Path=Name}"?/>
????????</DataTemplate>
????</ItemsControl.ItemTemplate>
????<ItemsControl.ItemsPanel>
????????<ItemsPanelTemplate>
????????????<VirtualizingStackPanel?/>
????????</ItemsPanelTemplate>
????</ItemsControl.ItemsPanel>
????<ItemsControl.Template>
????????<ControlTemplate>
????????<Border
????????????BorderThickness="{TemplateBinding?Border.BorderThickness}"
????????????Padding="{TemplateBinding?Control.Padding}"
????????????BorderBrush="{TemplateBinding?Border.BorderBrush}"
????????????Background="{TemplateBinding?Panel.Background}"
????????????SnapsToDevicePixels="True">
????????????????<ScrollViewer
????????????????????Padding="{TemplateBinding?Control.Padding}"
????????????????????Focusable="False">
????????????????????<ItemsPresenter
????????????????????????SnapsToDevicePixels="{TemplateBinding?UIElement.SnapsToDevicePixels}"?/>
????????????????</ScrollViewer>
????????????</Border>
????????????</ControlTemplate>
????</ItemsControl.Template></ItemsControl>
慕雪6442864
TA貢獻1812條經驗 獲得超5個贊
<!--Virtualised ItemsControl--><Style x:Key="ItemsControlVirtualizedStyle" TargetType="ItemsControl">
<Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="True"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="True"/>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ItemsControl">
<Border
BorderThickness="{TemplateBinding Border.BorderThickness}"
Padding="{TemplateBinding Control.Padding}"
BorderBrush="{TemplateBinding Border.BorderBrush}"
Background="{TemplateBinding Panel.Background}"
SnapsToDevicePixels="True"
>
<ScrollViewer Padding="{TemplateBinding Control.Padding}" Focusable="False">
<ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
</ScrollViewer>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter></Style>
12345678_0001
TA貢獻1802條經驗 獲得超5個贊
ItemsPanelVirtualizingStackPanel
<ItemsControl> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <VirtualizingStackPanel /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel></ItemsControl>
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