WPF关于ScrollViewr劫持鼠标滚轮的问题

解决方案：动态向上查找外层的ScrollViewer并抛出事件。

后端：

private void InnerScrollViewer_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    var scrollViewer = sender as ScrollViewer;
    if (scrollViewer == null)
        return;

    bool scrollAtTop = scrollViewer.VerticalOffset == 0;
    bool scrollAtBottom = scrollViewer.VerticalOffset >= scrollViewer.ScrollableHeight;

    if ((e.Delta > 0 && scrollAtTop) || (e.Delta < 0 && scrollAtBottom))
    {
        // 尝试向上查找父级ScrollViewer
        var parentScrollViewer = GetParentScrollViewer(scrollViewer);
        if (parentScrollViewer != null)
        {
            e.Handled = true;
            // 把事件“转发”给父ScrollViewer
            var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
            {
                RoutedEvent = UIElement.MouseWheelEvent,
                Source = sender
            };
            parentScrollViewer.RaiseEvent(eventArg);
        }
    }
    else
    {
        // 内部ScrollViewer自己处理
        e.Handled = false; // 让它滚动
    }
}

/// <summary>
/// 向上查找最近的父ScrollViewer，排除自己
/// </summary>
private ScrollViewer GetParentScrollViewer(DependencyObject start)
{
    var parent = VisualTreeHelper.GetParent(start);
    while (parent != null)
    {
        if (parent is ScrollViewer sv)
            return sv;
        parent = VisualTreeHelper.GetParent(parent);
    }
    return null;
}

前端：（引用一下InnerScrollViewer_PreviewMouseWheel这个事件就行） 

<ScrollViewer HorizontalScrollBarVisibility="Auto" PreviewMouseWheel="InnerScrollViewer_PreviewMouseWheel"/>