一个for循环根据条件可以递增或递减 RT: for (int k = n-1; k >=0;k--){int x = 0;if (r.Order == 1){x = n - k - 1;}else{x = k;}//DataRow r1 = table1.Rows[k];DataRow r1 = table1.Rows[x];//dosomething}