c#ArrayList 对象集合 按某字段（属性）排序

主程序代码

newsCompare newsCompare = new ItemManage.newsCompare();

                    newsList.Sort(newsCompare);

自定义类代码（按照CREATEDATE属性排序）

class newsCompare : IComparer
    {
        int System.Collections.IComparer.Compare(object x, object y)
        {
            TJZB_GDNEWS model1 = new TJZB_GDNEWS();
            TJZB_GDNEWS newsX = (TJZB_GDNEWS)x;
            TJZB_GDNEWS newsY = (TJZB_GDNEWS)y;
            if (newsX.CREATEDATE > newsY.CREATEDATE)
                return -;
            if (newsX.CREATEDATE < newsY.CREATEDATE)
                return ;
            return ;
        }
    }