ObservableCollection <t>：区分重新排序和删除</t>

Question

如何区分GridViewItem GridView内CollectionChanged事件中的重新订购和删除？

void gridView_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
   //e seems to be same for Re-order and Remove
}

有什么建议吗？