mysqldataadapter为空

using System;
using System.Data;
using MySql.Data.MySqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Server=your_server_address;Database=your_database;Uid=your_username;Pwd=your_password;";
        string sqlQuery = "SELECT * FROM your_table";

        using (MySqlConnection connection = new MySqlConnection(connectionString))
        {
            try
            {
                connection.Open();

                using (MySqlDataAdapter adapter = new MySqlDataAdapter(sqlQuery, connection))
                {
                    DataTable dataTable = new DataTable();
                    adapter.Fill(dataTable);

                    // 使用 dataTable 进行后续操作
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error: " + ex.Message);
            }
        }
    }
}