（自己的學習記錄，小夥伴們覺得有用可參考）

C#window視窗應用程式連線MySQL資料庫：

步驟：

匯入MySql.Data.dll檔案

引入名稱空間

建立連結：

private string MySqlCon = "server = localhost;User Id = root;Password = root;Database = windows_sql";//主機IP地址；使用者ID；密碼；資料庫；
MySqlConnection con= new MySqlConnection(MySqlCon);

具體實現：

匯入檔案參考：

https://blog.csdn.net/liyuqian199695/article/details/53556639/

主要就是找對路徑！！！：

檢測程式碼參考

https://jingyan.baidu.com/article/ac6a9a5e103f5f2b653eac1a.html

如果不想敲，這裡有歐：

//MySQLConn.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using System.Data;
namespace test_sql1
{
    
 
class MySQLConn
    {
        private string MySqlCon = "server = localhost;User Id = root;Password = root;Database = windows_sql";
        public DataTable ExecuteQuery(string sqlStr)
        {
            MySqlCommand cmd;
            MySqlConnection con;
            MySqlDataAdapter sda;
            con 
 
= new MySqlConnection(MySqlCon);
            con.Open();
            cmd = new MySqlCommand(sqlStr, con);
            DataTable dt = new DataTable();
            sda = new MySqlDataAdapter(cmd);
            sda.Fill(dt);
            return dt;
        }
        public int ExecuteUpdate(string sqlStr)
        {
            MySqlCommand cmd;
            MySqlConnection con;
            con = new MySqlConnection(MySqlCon);
            con.Open();
            cmd = new MySqlCommand(sqlStr, con);
            cmd.CommandType = CommandType.Text;
            int iud = 0;
            iud = cmd.ExecuteNonQuery();
            con.Close();
            return iud;

        }
    }
}

//Form1.cs -- 

 private void Form1_Load(object sender, EventArgs e)
        {
            MySQLConn con = new MySQLConn();
            string sql_str = "select*from stu_1";
            dataGridView1.DataSource = con.ExecuteQuery(sql_str);
        }