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lang: ja-jp
breaks: true
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# WPF UIの仮想化 を使用して大量データを表示する 2022-06-27

> パフォーマンスの最適化:コントロール
> https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/advanced/optimizing-performance-controls

## ListBox

> 方法: ListBox のスクロール速度を向上させる
> https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/controls/how-to-improve-the-scrolling-performance-of-a-listbox

    <Window.DataContext>
        <viewModels:MainWindowViewModel />
    </Window.DataContext>

    <Grid>
        <ListBox 
            ItemsSource="{Binding Peoples_IEnumerable}" 
            VirtualizingStackPanel.VirtualizationMode="Recycling" />
    </Grid>

## DataGrid

    <Window.DataContext>
        <viewModels:MainWindowViewModel />
    </Window.DataContext>

    <Grid>
        <DataGrid
            ItemsSource="{Binding Peoples_IEnumerable, IsAsync=True}" 
            
            AutoGenerateColumns="False"
            
            VirtualizingStackPanel.IsVirtualizing="True"
            VirtualizingStackPanel.VirtualizationMode="Standard" 
            
            EnableColumnVirtualization="True"
            EnableRowVirtualization="True"
            
            CanUserAddRows="False"
            CanUserDeleteRows="False"
            
            SelectionMode="Extended"
            SelectionUnit="FullRow"
            
            ScrollViewer.PanningMode="VerticalOnly"
            ScrollViewer.IsDeferredScrollingEnabled="False"
            ScrollViewer.VerticalScrollBarVisibility="Visible"
            ScrollViewer.HorizontalScrollBarVisibility="Visible"
            />
    </Grid>

###### tags: `WPF` `UIの仮想化` `大量データ`