static void Main(string[] args) { MySqlConnection conn = DAOHelper.GetConnection(); IDataReader reader = DAOHelper.QueryReader("SELECT * FROM user", conn); while (reader.Read()) { Console.WriteLine(reader["Host"]); // 打印出每个用户的用户名 } //DataTable table = ds.Tables[0]; //string user = table.Columns["User"].ToString(); //Console.WriteLine("abcd"); Console.ReadLine(); }