ListBox 滑动到底部自动加载数据

核心提示：var visualState = e.NewState.Name; if (visualState == "NotScrolling") { var v1 = _scrollViewer.ExtentHeight - _scrollViewer.VerticalOffset; var v2

var visualState = e.NewState.Name;

if (visualState == "NotScrolling")
{
var v1 = _scrollViewer.ExtentHeight - _scrollViewer.VerticalOffset;
var v2 = _scrollViewer.ViewportHeight;

if (v1 <= v2)
{
// TODO: 在此处加载新数据
}
}
}
页面的Loaded事件
_scrollViewer = FindVisualElement<ScrollViewer>(lstBoxOne);

if (_isHookedScrollEvent)
{
return;
}

if (_scrollViewer != null)
{
_isHookedScrollEvent = true;

FrameworkElement element = VisualTreeHelper.GetChild(_scrollViewer, 0) as FrameworkElement;
if (element != null)
{
VisualStateGroup visualStateGroup = FindVisualState(element, "ScrollStates");
visualStateGroup.CurrentStateChanged += new EventHandler<VisualStateChangedEventArgs>(visualStateGroup_CurrentStateChanged);

}
}

备注：此实例只实现了在ListBox底端刷新数据。若要实现向上滚动到顶端刷新数据，只需要按照原理中的描述，修改ScrollViewer状态改变事件中的逻辑就可以了。