在WPF中，如何滚动到FlowDocumentScrollViewer的底部？

Question

一个普通的ScrollViewer似乎有一个方法可以实现这一点。FlowDocumentScrollViewer不需要。那么我该如何在底部设置一个FlowDocumentScrollViewer呢？

Answer 1

您可以从flowdocumentscrollviewer访问scrollviewer。下面是一个例子

 private void MainWindow_Loaded(object sender, RoutedEventArgs e)
    {
        var scrollViewer = FindScrollViewer(flowDocumentScrollViewer);
        scrollViewer.ScrollToBottom();
    }

    public static ScrollViewer FindScrollViewer(FlowDocumentScrollViewer flowDocumentScrollViewer)
    {
        if (VisualTreeHelper.GetChildrenCount(flowDocumentScrollViewer) == 0)
        {
            return null;
        }

        // Border is the first child of first child of a ScrolldocumentViewer
        DependencyObject firstChild = VisualTreeHelper.GetChild(flowDocumentScrollViewer, 0);
        if (firstChild == null)
        {
            return null;
        }

        Decorator border = VisualTreeHelper.GetChild(firstChild, 0) as Decorator;

        if (border == null)
        {
            return null;
        }

        return border.Child as ScrollViewer;
    }

Answer 2

或者，您可以使用提供的答案here，并搜索ScrollViewer：

public static void ScrollToEnd(FlowDocumentScrollViewer fdsv)
{
    ScrollViewer sc = FindVisualChildren<ScrollViewer>(fdsv).First() as ScrollViewer;
    if (sc != null)
        sc.ScrollToEnd();
}


public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
{
    if (depObj != null)
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
            if (child != null && child is T)
            {
                yield return (T)child;
            }

            foreach (T childOfChild in FindVisualChildren<T>(child))
            {
                yield return childOfChild;
            }
        }
    }
}