windows phone開發之 listbox分頁加載數據

        private void listbox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (Result[0] == "1")
            {
                //獲取listbox的子類型ScrollViewer

                ScrollViewer scrollViewer = FindChildOfType<ScrollViewer>((ListBox)sender);
                if (scrollViewer == null)
                {
                    throw new InvalidOperationException("erro");
                }
                else
                {
                    //判斷當前滾動的高度是否大于或者等于scrollViewer實際可滾動高度，如果等于或者大于就證明到底了
                    if ((scrollViewer.VerticalOffset + 1) >= scrollViewer.ScrollableHeight)
                    {
                        MessageBox.Show("aaa");
                    }
                }
            }
        }


    //獲取子類型        
    public static T FindChildOfType<T>(DependencyObject root) where T : class
    {
        var queue = new Queue<DependencyObject>();
        queue.Enqueue(root);
        while (queue.Count > 0)
        {
            DependencyObject current = queue.Dequeue();
            for (int i = VisualTreeHelper.GetChildrenCount(current) - 1; 0 <= i; i--)
            {
                var child = VisualTreeHelper.GetChild(current, i);
                var typedChild = child as T;
                if (typedChild != null)
                {
                    return typedChild;
                }
                queue.Enqueue(child);
            }
        }
        return null;
    }</pre>