Connecting Visual Studio to a SSH Tunneled MySQL Server

For security reasons, sometimes the database server can only be accessed through SSH. For example, the MySql service is installed on server A, and machine A can only be accessed by machine B, and the deployment environment may be on machine C. In this case, C The server connects to the A server through the B server. At this time, SSH connection is required, and the SSH.NET class library is required:
code show as below:

using MySql.Data.MySqlClient;
using Renci.SshNet;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace SSHMySql
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
                SSHConnectMySql();
            }

            public void SSHConnectMySql()
            {
                string SSHHost = "*.*.*.*";        // SSH address
                int SSHPort = ;              // SSH port
                string SSHUser = "user";           // SSH username
                string SSHPassword = "pwd";           // SSH password

                string sqlIPA = "127.0.0.1";// Map addresses  In fact, it is possible to write other MySql on Linux My.cnf bind-address can be set to 0.0.0.0 or not
                string sqlHost = "192.168.1.20"; // The IP address of the machine installed by mysql can also be an intranet IP, for example: 192.168.1.20
                uint sqlport = ;        // Database port and mapping port
                string sqlConn = "Database=mysql;Data Source=" + sqlIPA + ";Port=" + sqlport + ";User Id=user;Password=pwd;CharSet=utf8";
                string sqlSELECT = "select * from user";

                PasswordConnectionInfo connectionInfo = new PasswordConnectionInfo(SSHHost, SSHPort, SSHUser, SSHPassword);
                connectionInfo.Timeout = TimeSpan.FromSeconds();
                using (var client = new SshClient(connectionInfo))
                {
                    try
                    {
                        client.Connect();
                        if (!client.IsConnected)
                        {
                            MessageBox.Show("SSH connect failed");
                        }

                        var portFwdL = new ForwardedPortLocal(sqlIPA, sqlport, sqlHost, sqlport); // map to local port
                        client.AddForwardedPort(portFwdL);
                        portFwdL.Start();
                        if (!client.IsConnected)
                        {
                            MessageBox.Show("port forwarding failed");
                        }

                        MySqlConnection conn = new MySqlConnection(sqlConn);
                        MySqlDataAdapter myDataAdapter = new MySqlDataAdapter();
                        myDataAdapter.SelectCommand = new MySqlCommand(sqlSELECT, conn);

                        try
                        {
                            conn.Open();
                            DataSet ds = new DataSet();
                            myDataAdapter.Fill(ds);
                            dataGridView1.DataSource = ds.Tables[];
                        }
                        catch (Exception ee)
                        {
                            MessageBox.Show(ee.Message);
                        }
                        finally
                        {
                            conn.Close();
                        }

                        client.Disconnect();
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }
    }

Note: If an error occurs, you can stop the MySql service on the local (development machine).

Required dll: SSHDLL.rar