我想把讀取出來的字段存到數(shù)組里（string [] a）應(yīng)該怎么做public string  QeryList()        {            string str = " ";            string qery = "SELECT Nums from orderList ";            SqlDataReader reader = DBHelper.GetReadData(qery);            if (reader.HasRows)            { reader.Read();                   str += "\n 數(shù)量："+reader["Nums"].ToString();                }                     return str;        }