Question

我有10000个对象（需要大量处理）才能加载到我的UWP应用上的GridView。（查看带有红色突出显示区域的图像。）

首先，我需要从DB获取所有10000条记录，然后逐步处理每个对象，然后将其加载到视图中，同时保持UI响应。

目前一个问题是需要应用程序只需要一行水平显示数据，所以我使用了GridView。这是XAML。

<ScrollViewer Grid.Column="1" Grid.Row="1" HorizontalScrollBarVisibility="Auto" HorizontalScrollMode="Auto"
                      VerticalScrollBarVisibility="Disabled" VerticalScrollMode="Disabled" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
                <GridView x:Name="MeetingGridView" ItemsSource="{Binding MeetingList}" Tag="{Binding MeetingList}"
                ItemContainerStyle="{StaticResource GridViewItemStyle}" SelectionChanged="MeetingGridViewSelectionChanged"
                          ItemTemplate="{StaticResource MeetingBoxDataTemplate}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
                    <GridView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsWrapGrid MaximumRowsOrColumns="1"/>
                        </ItemsPanelTemplate>
                    </GridView.ItemsPanel>
                </GridView>
            </ScrollViewer>

我已经实现了ISupportIncrementalLoading，但由于我设计XAML的方式，它在滚动时效果不佳。它不是逐步加载数据，而是将所有内容加载到视图中。因此，在处理完所有内容并加载到视图后，GridView无响应。

这是增量加载代码。

public class ItemsToShow : ObservableCollection<MeetingModel>, ISupportIncrementalLoading
    {
        public int lastItem = 0;

        public bool HasMoreItems
        {
            get
            {
                if (_globalDisplayMeetings == null || itemsToSkip == _globalDisplayMeetings.Count || itemsToSkip > _globalDisplayMeetings.Count)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
        }

        List<MeetingModel> items = new List<MeetingModel>();
        int itemsToSkip = 0;
        public IAsyncOperation<LoadMoreItemsResult> LoadMoreItemsAsync(uint count)
        {
            if (itemsToSkip > _globalDisplayMeetings.Count()) { }

            ProgressBar progressBar = ((Window.Current.Content as Frame).Content as MeetingsPage).PgbPage;
            CoreDispatcher coreDispatcher = Window.Current.Dispatcher;

            return Task.Run<LoadMoreItemsResult>(async () =>
            {
                await coreDispatcher.RunAsync(CoreDispatcherPriority.Low,
                    () =>
                    {
                        progressBar.IsIndeterminate = true;
                        progressBar.Visibility = Visibility.Visible;
                    });

                items = _globalDisplayMeetings.Skip(itemsToSkip).Take((int)count).ToList();
                itemsToSkip = itemsToSkip + (int)count;

                await coreDispatcher.RunAsync(CoreDispatcherPriority.Low,
                    () =>
                    {
                        foreach (MeetingModel item in items)
                        {
                            this.Add(item);
                        }

                        progressBar.Visibility = Visibility.Collapsed;
                        progressBar.IsIndeterminate = false;
                    });

                return new LoadMoreItemsResult() { Count = count };
            }).AsAsyncOperation<LoadMoreItemsResult>();
        }
    }

请让我知道如何解决这个问题。我需要的行为与Android recyclerview相同。一切都会有所帮助。感谢。

将大数据集加载到gridview - UWP

0 个答案: