将DataRow转换为DataTable

        /// <summary>
        /// DataRow转换为DataTable
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="strWhere">筛选的条件</param>
        /// <returns></returns>
        public DataTable SreeenDataTable(DataTable dt, string strWhere)
        {
            if (dt.Rows.Count <= 0) return dt;        //当数据为空时返回
            DataTable dtNew = dt.Clone();         //复制数据源的表结构
            DataRow[] dr = dt.Select(strWhere);  //strWhere条件筛选出需要的数据！
            for (int i = 0; i < dr.Length; i++)
            {
                dtNew.Rows.Add(dr[i].ItemArray);  // 将DataRow添加到DataTable中
            }
            return dtNew;
        }