WPF ListBox虛擬化

在ListBox加載大量數據的情況下，如果不進行虛擬化，內存將逐漸增大，長時間運行后將造成卡頓
所以需要虛擬化
寫法

<ListBox x:Name="listBox" VirtualizingStackPanel.VirtualizationMode="Recycling"  VirtualizingStackPanel.IsVirtualizing="True">
    <ListBox.ItemsPanel>
        <ItemsPanelTemplate >
            <VirtualizingStackPanel  Orientation="Vertical" />
        </ItemsPanelTemplate>
    </ListBox.ItemsPanel>
</ListBox>

VirtualizationMode包括Recycling和Standard

Recycling：重復利用
Standard：創建和丟棄容器

測試：定時向ListBox加入數據

Timer timer;
int number = 1;
timer=new Timer();
timer.Interval = 1;
timer.Elapsed += AddData;
listBox.ItemsSource = new ObservableCollection<string>();
timer.Start();

private void AddData(object sender, ElapsedEventArgs e)
{
    listBox.Dispatcher.Invoke(() =>
    {
        number++;
        var dataContext = listBox.ItemsSource as ObservableCollection<string>;
        if (dataContext != null)
            dataContext.Add(number.ToString());
        if (listBox.Items.Count > 0)
        {
            listBox.ScrollIntoView(listBox.Items[listBox.Items.Count - 1]);
        }
        if (dataContext != null && dataContext.Count > 200)
        {
            dataContext.Clear();
        }

    });
}

參考資料

How to use UI virtualization with redefined ListBox templates
VirtualizationMode Enum
WPF 列表開啟虛擬化的方式

示例代碼

VirtualizingListBox