WPF 中的 ListBox、VirtualizingStackPanel 和平滑滚动 [英] ListBox, VirtualizingStackPanel, and Smooth Scrolling in WPF

问题描述

我有一个 ListBox，它可能有许多行模板化数据库记录，包括一个 Image，绑定到一个 ObservableCollection.有时，该系列可能包含数千件物品.

I have a ListBox that may have many rows of templated DB records, including an Image, bound to an ObservableCollection<MyItem>. Sometimes the collection could hold thousands of items.

性能很棒，但滚动是默认的跳跃行为.我希望它能够平滑滚动，所以我取消选中 ScrollViewer.CanContentScroll.

The performance is great, but the scrolling is the default jumpy behavior. I would like it to have smooth scrolling, so I unchecked ScrollViewer.CanContentScroll.

现在我有流畅的滚动，但性能很糟糕:数据在单独的线程中检索，线程很快完成，但结果显示在ListBox.我认为这是因为取消选中 ScrollViewer.CanContentScroll 将底层 VirtualizingStackPanel 更改为常规的 StackPanel，因此它在显示之前加载整个集合结果.

Now I have smooth scrolling, but the performance is horrendous: the data is retrieved in a separate thread, and the thread finishes quickly, but it takes 10-20 seconds for the results to show in the ListBox. I assume that this is because unchecking ScrollViewer.CanContentScroll changes the underlying VirtualizingStackPanel to a regular StackPanel and so it is loading the entire collection before displaying the results.

所以我的问题是:如何在不牺牲 VirtualizingStackPanel 行为和性能的情况下保持平滑滚动?

So my question is this: how do I retain the the smooth scrolling without sacrificing the VirtualizingStackPanel behavior and performance?

推荐答案

当您取消选中 CanContentScroll 时，您失去虚拟化.答案确实令人沮丧:目前还没有现成的解决方案:(.

When you uncheck CanContentScroll, you lose virtualization. And the answer is really frustrating: For now there is no out-of-the-box solution :(.

PS:这不是这里的第一篇帖子，问这个问题.

PS: This is not the first post here, asking this very question.

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