TabControl WPF 中的 ListView 性能不佳

Question

我有一个 TabControl 和三个 TabItems。每个 TabItem 都有自己的 ViewModel。最后一个选项卡包含一个 ListView 和 +1500 条记录。所以每次我打开这个选项卡，渲染都需要 +-10 秒。我想优化 ListView，这样每次渲染都不会花那么长时间。

我正在将 ObservableCollection 绑定到 ListView。

ListView 看起来像这样

<ListView>
    <ListView.View>
        <GridView>
            <GridViewColumn>
                <GridViewColumnHeader>
                   <TextBox... custom templates for filtering here
                </GridViewColumnHeader>
            </GridViewColumn>
            </GridView>
    <ListView.View>
</ListView>

我已经试过了：

<VirtualizingPanel.VirtualizationMode="Recycling">

这会加快速度，但会使滚动变得非常慢。

Answer 1

我认为您可以将大 collection 放在几个小页面（20/50 项）上，然后一点点添加新项。我可以建议您使用 Behavior 来刷新页面。只需绑定等待命令即可将新项目添加到 collection。向下滚动时将添加新项目。

internal class ScrollEndToCommandBehavior : Behavior<ScrollViewer>
{
    #region Public Static Fields and Constants

    public static readonly DependencyProperty CommandParameterProperty =
        DependencyProperty.Register("CommandParameter", typeof (object), typeof (ScrollEndToCommandBehavior), new PropertyMetadata(null));

    public static readonly DependencyProperty CommandProperty =
        DependencyProperty.Register("Command", typeof (ICommand), typeof (ScrollEndToCommandBehavior), new PropertyMetadata(null));

    #endregion

    #region Public Properties

    public ICommand Command
    {
        get { return (ICommand) GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }


    public object CommandParameter
    {
        get { return GetValue(CommandParameterProperty); }
        set { SetValue(CommandParameterProperty, value); }
    }

    #endregion

    #region Protected Methods

    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.ViewChanged += AssociatedObjectOnViewChanged;
    }

    protected override void OnDetaching()
    {
        AssociatedObject.ViewChanged -= AssociatedObjectOnViewChanged;
        base.OnDetaching();
    }

    #endregion

    #region Private Methods

    private void AssociatedObjectOnViewChanged(object sender, ScrollViewerViewChangedEventArgs eventArgs)
    {
        if (!eventArgs.IsIntermediate && Math.Abs(AssociatedObject.ScrollableHeight - AssociatedObject.VerticalOffset) < 5)
        {
            Command?.Execute(CommandParameter);
        }
    }

    #endregion
}

TabControl WPF 中的 ListView 性能不佳

Bad performance ListView in TabControl WPF

wpf

performance

listview

tabcontrol

mvvm