1、搭建一个特别简单的窗体

简单且丑陋~

2、代码编写

新建一个DataBase.cs的类：

写入代码：

//DataBase.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace SQLServerTest
{
    class DataBase
    {
        public SqlConnection getConn()
        {
            string strConn = "server=localhost;database=test1007;uid=1007;pwd=123456";
            SqlConnection sqlConnection = new SqlConnection(strConn);
            return sqlConnection;
        }
    }
}


//Form1.cs
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;
using System.Data;
using System.Data.SqlClient;

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

        //查询数据库信息
        private void button1_Click(object sender, EventArgs e)
        {
            //获取数据库连接
            DataBase dataBase = new DataBase();
            SqlConnection sqlConnection = dataBase.getConn();

            //打开连接
            sqlConnection.Open();

            //定义sql语句
            string sql = "select * from testTable";

            //执行sqlCommand对象
            SqlCommand sqlCommand = new SqlCommand(sql,sqlConnection);

            //创建数据适配器
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();

            //执行sql语句
            sqlDataAdapter.SelectCommand = sqlCommand;

            //创建数据集
            DataSet dataSet = new DataSet();

            sqlDataAdapter.Fill(dataSet,"testTable");

            dataGridView1.DataSource = dataSet.Tables[0];

            //关闭连接
            sqlConnection.Close();
        }
    }
}

需要先将这两个using块引用进去：