Visual Studio 2015 C# MYSQL-“连接已打开”

using System;
using MySql.Data.MySqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "server=localhost;user=root;database=mydatabase;password=mypassword";
        
        MySqlConnection connection = new MySqlConnection(connectionString);
        
        try
        {
            connection.Open();
            
            // 执行数据库操作
            
            // 关闭连接
            connection.Close();
        }
        catch (Exception ex)
        {
            Console.WriteLine("发生异常：" + ex.Message);
        }
        finally
        {
            // 确保连接在发生异常时也能被关闭
            if (connection.State != ConnectionState.Closed)
            {
                connection.Close();
            }
        }
    }
}