“Win10 UAP 开发系列”之 在MVVM模式中控制ListView滚动位置

/// <summary>
    /// 将ListView滚动到顶部 使用方法：在ListView增加扩展属性
    /// ext:ListViewScrollToProperties.ScrollToIndex="{Binding ScrollToIndex}"
    /// 在VM中先vm.ScrollToIndex = 1;再vm.ScrollToIndex = 0;
    /// </summary>
    public class ListViewScrollToProperties : DependencyObject
    {
        public static readonly DependencyProperty ScrollToIndexProperty =
            DependencyProperty.RegisterAttached("ScrollToIndex", typeof(int), typeof(ListViewScrollToProperties), new PropertyMetadata("", OnScrollToIndexChanged));

        public static string GetScrollToIndex(DependencyObject dependencyObject)
        {
            return (string)dependencyObject.GetValue(ScrollToIndexProperty);
        }

        public static void SetScrollToIndex(DependencyObject dependencyObject, string scrollToIndex)
        {
            dependencyObject.SetValue(ScrollToIndexProperty, scrollToIndex);
        }

        private static void OnScrollToIndexChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if ((int)e.NewValue != 1)
            {
                var listview = (ListView)d;
                if (listview != null)
                {
                    if (listview.Items.Count > 0)
                    {
                        try
                        {
                            var target = listview.Items[int.Parse(e.NewValue.ToString())];
                            if (target != null)
                            {
                                listview.UpdateLayout();
                                listview.ScrollIntoView(target);
                            }
                        }
                        catch (Exception ex)
                        {
                            System.Diagnostics.Debug.WriteLine(ex.Message);
                        }
                    }
                }
            }
        }
    }

<ListView ItemsSource="{Binding ArticleItemList}" 
                              controlHelper:ListViewScrollToProperties.ScrollToIndex="{Binding ScrollToIndex}"
                              Margin="0"></ListView>

//滚动到顶部
ScrollToIndex = 1;
ScrollToIndex = 0;