滚动到 ScrollViewer 结尾的最佳方式 [英] Best Way to Scroll to End of ScrollViewer

问题描述

目前，当我添加新项目时，我让代码自动滚动到末尾的唯一方法如下:

Currently, the only way I have gotten my code to auto scroll to the end when I add a new item is the following:

XAML:

<ScrollViewer x:Name="chatViewScroller" HorizontalAlignment="Left" Height="201" Margin="0,32,0,0" VerticalAlignment="Top" Width="475" Background="#7FFFFFFF">
    <StackPanel x:Name="chatViewContent" />
</ScrollViewer>

代码:

                chatViewContent.Children.Add(
                    new TextBlock() {
                        Text = text,
                        FontSize = 18,
                        TextWrapping = Windows.UI.Xaml.TextWrapping.Wrap,
                        Margin = new Thickness(10, 3, 10, 0),
                        Foreground = new Windows.UI.Xaml.Media.SolidColorBrush(
                            isServerMessage ? Windows.UI.Colors.Purple : Windows.UI.Colors.Black)
                    });
                await Task.Delay(10);
                chatViewScroller.ScrollToVerticalOffset(chatViewScroller.ScrollableHeight);

这是公认的做法吗?我是否必须等待一些随机的时间?

Is this the accepted way of doing it? Do I have to wait for some random period of time?

推荐答案

使用 ActualHeight 对我不起作用(我还没有弄清楚原因) - 但是像这样使用 ScrollableHeight 就成功了:

Using ActualHeight did not work for me (I have yet to figure out why) - but using ScrollableHeight like this did the the trick:

// adding item to ItemsControl...
// ...
_scrollViewer.UpdateLayout();
_scrollViewer.ScrollToVerticalOffset(_scrollViewer.ScrollableHeight);

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