win10 ObservableCollection 排序自动收缩问题

ObservableCollection本身是没有排序Sort功能的，不过我们可以通过冒泡排序来实现，以下是扩展功能：

public static void Sort<T>(this ObservableCollection<T> collection, IComparer<T> comparer)
        {
            if (collection == null || collection.Count == 0) return;

            int i, j;
            T index;
            for (i = 1; i < collection.Count; i++)
            {
                index = collection[i];
                j = i;
                while ((j > 0) && (comparer.Compare(collection[j - 1], index) == 1))
                {
                    collection[j] = collection[j - 1];
                    j = j - 1;
                }
                collection[j] = index;
            }
        }

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