DataTable 复制表和行

DataTable dt = GetKeywordsStatistic(nick, campaign_id, adgroup_id, beginTime, endTime);
            DataRow dr = dt.Select(string.Format("keyword_id = {0}", Convert.ToInt64(EnumKeywordId.NoSearch))).SingleOrDefault();
            DataTable dtRes = dt.Clone(); //复制结构
            DataTable dtRes = dt.Copy(); //复制结构和数据
            dtRes.Rows.Add(dtRes.NewRow().ItemArray = dr.ItemArray);
            return dtRes;