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WPF ListBox虚拟化

2022-06-21 20:41:00 【zLulus】

在ListBox加载大量数据的情况下，如果不进行虚拟化，内存将逐渐增大，长时间运行后将造成卡顿
所以需要虚拟化
写法

<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：重复利用
Standard：创建和丢弃容器

测试：定时向ListBox加入数据

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();
        }

    });
}