zj-Exercise/C#/WindowsFormsDataSetCopy/Form1.cs

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

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

        MySqlConnection conn;
        DataSet ds;

        private void Form1_Load(object sender, EventArgs e)
        {
            conn = new MySqlConnection("server=localhost;database=csharp;uid=root;pwd=abc123");
            MySqlCommand cmd = new MySqlCommand("select * from tb_test", conn);
            MySqlDataAdapter sda = new MySqlDataAdapter();
            sda.SelectCommand = cmd;
            ds = new DataSet();
            sda.Fill(ds, "test");
            dataGridView1.DataSource = ds.Tables[0];
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //复制
            DataSet ds1 = ds.Copy();
            dataGridView2.DataSource = ds1.Tables[0];
        }
    }
}