关于在DataTable中执行DataTable.Select("条件")返回DataTable的解决方法

        /// <summary>
        /// 执行DataTable中的查询返回新的DataTable
        /// </summary>
        /// <param name="dt">源数据DataTable</param>
        /// <param name="condition">查询条件</param>
        /// <returns></returns>
      private DataTable GetNewDataTable(DataTable dt,string condition)
        {            
            DataTable newdt = new DataTable(); 
            newdt=dt.Clone();
            DataRow[] dr = dt.Select(condition); 
            for(int i=0;i<dr.Length;i++) 
            { 
                newdt.ImportRow((DataRow)dr[i]);
            } 
            return newdt;//返回的查询结果
        }