C# 从数据库中读取数据(ExecuteReader)

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

namespace _07SqlDataReader
{
public partial class MainFrm : Form
{
public MainFrm()
{
InitializeComponent();
//
}

private void MainFrm_Load(object sender, EventArgs e)
{
List<StudentInfo> stuList =new List<StudentInfo>();  //StudentInfo 是自定义的一个学生信息类，用于存放读出来的数据

//加载数据库中数据
string conStr = "server=.;uid=sa;pwd=123456;database=itcastdb";
using (SqlConnection con = new SqlConnection(conStr))
{
using (SqlCommand cmd =con.CreateCommand())
{
con.Open();
cmd.CommandText = "select  stuName,stuId, stuSex, stuBirthdate, stuPhone from [tblStudent] ";
//reader  指向了  sql命令执行后的查询结果。
using (SqlDataReader reader = cmd.ExecuteReader())
{
//reader每执行一次read操作，就会让指针往下一条数据走
while (reader.Read())  //如果能读到数据，一行一行地读
{
#region 参考
// //reader 取数据
//int stuId= reader.GetInt32(1);
////string stuName = reader.GetString(0);

////建议用下面
//string stuName2 = reader["stuName"].ToString();
//Console.WriteLine(
//    string.Format("{0}-{1}-{2}-{3}", reader["stuName"].ToString(),reader["stuId"].ToString(),reader["stuBirthdate"].ToString(),reader["stuPhone"].ToString())
//    );
#endregion
StudentInfo stu =new StudentInfo();
stu.StuId = int.Parse(reader["stuId"].ToString());
stu.StuName = reader["stuName"] == DBNull.Value ? string.Empty : reader["stuName"].ToString();

stu.StuPhone = reader["stuPhone"].ToString();
stu.StuSex = reader["stuSex"].ToString()[0];
stu.DateTime = DateTime.Parse(reader["stuBirthdate"]==DBNull.Value?SqlDateTime.MinValue.ToString(): reader["stuBirthdate"].ToString());
stuList.Add(stu);
}//end  while
}// end  using reader
}//end  usering  cmd
}//end using connn

//把数据放到窗体的表格。。。。。。。。。
}
}
}