Linq批量删除数据

 public void DeleteNews(List<string> IDList)
        {            
            using (ETCDataContext etcDataContext = this.EtcDataContext)
            {
                var news = etcDataContext.SYS_News.Where(o => IDList.Contains(o.ID.ToString()));
                etcDataContext.SYS_News.DeleteAllOnSubmit(news);
                etcDataContext.SubmitChanges();
            }
        }