CollectionViewSource 筛选器很慢

本文关键字：筛选 CollectionViewSource | 更新日期: 2023-09-27 18:34:19

当列表很大时，过滤会变慢。有没有更快的方法来处理过滤器？目前这就是我所拥有的。

CollectionViewSource orderListCVS;
private void showCompletedRB(object sender, RoutedEventArgs e)
{
    CollectionView coll = orderListCVS.View as CollectionView;
    coll.Filter = null;
    orderListCVS.Filter += new FilterEventHandler(showCompletedFilter);
}
private void showCompletedFilter(object sender, FilterEventArgs e)
{
    Order order = e.Item as Order;
    if (order != null)
    {
        e.Accepted = (order.Status == Data.Status.Done);
    }
}

CollectionViewSource 筛选器很慢

你有没有试过这种方式： 

public partial class MainWindow : Window
{
    private ICollectionView orderListCVS;
    private List<Order> orders;
    public MainWindow()
    {
        InitializeComponent();
        orders = new List<Order>();
        orderListCVS = CollectionViewSource.GetDefaultView(orders);
    }
    private bool showCompletedFilter(object sender)
    {
        Order order = sender as Order;
        if (order != null)
        {
            return order.Status == Data.Status.Done;
        }
        return false;
    }
    private void showCompletedRB(object sender, RoutedEventArgs e)
    {
        orderListCVS.Filter = showCompletedFilter;
    }
}

这是使用 collectionView 的最常见方式。

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