form里拖放一个DataGridView和一个BindingSource,编译没有错误
代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace 快餐店win代码
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string conn_string = "Data Source=yh-20120602uzvz\\SQLNEW;Initial Catalog=FastFood;Integrated Security=True";//连接字符串
string sql = "Select CustomerID,userName,Password,Email form Customer";//查询select语句
SqlConnection conn = new SqlConnection(conn_string);//创建连接对象
SqlCommand cmd = new SqlCommand();//创建执行SQL命名形象 conn.Open();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = sql;
SqlDataReader customer1 = cmd.ExecuteReader(); //执行查询的select语句,并产生结果集
bindingSource1.DataSource = customer1;//把结果与bindingsource控件相结合并绑定
dataGridView1.DataSource = bindingSource1;//把dataGridView控件与bindingSource相结合并绑定
}
}
}
代码如下:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace 快餐店win代码
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string conn_string = "Data Source=yh-20120602uzvz\\SQLNEW;Initial Catalog=FastFood;Integrated Security=True";//连接字符串
string sql = "Select CustomerID,userName,Password,Email form Customer";//查询select语句
SqlConnection conn = new SqlConnection(conn_string);//创建连接对象
SqlCommand cmd = new SqlCommand();//创建执行SQL命名形象 conn.Open();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = sql;
SqlDataReader customer1 = cmd.ExecuteReader(); //执行查询的select语句,并产生结果集
bindingSource1.DataSource = customer1;//把结果与bindingsource控件相结合并绑定
dataGridView1.DataSource = bindingSource1;//把dataGridView控件与bindingSource相结合并绑定
}
}
}
Select CustomerID,userName,Password,Email from Customer
是自己敲的,不是自动生成的吧
这段去掉看看?
conn.Close();
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;namespace 快餐店win代码
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
protected virtual void On_Load( EventArgs e)
{
string conn_string = "Data Source=yh-20120602uzvz\\SQLNEW;Initial Catalog=FastFood;Integrated Security=True";//连接字符串
string sql = "Select CustomerID,userName,Password,Email from Customer";//查询select语句
SqlConnection conn = new SqlConnection(conn_string);//创建连接对象
SqlCommand cmd = new SqlCommand();//创建执行SQL命名形象 conn.Open();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = sql;
SqlDataReader customer1 = cmd.ExecuteReader(); //执行查询的select语句,并产生结果集
bindingSource1.DataSource = customer1;//把结果与bindingsource控件相结合并绑定
dataGridView1.DataSource = bindingSource1;//把dataGridView控件与bindingSource相结合并绑定
conn.Close();
}
}
}
在构造函数里加上this.Load += Form1_Load;就行了
自动生成的代码会在设计器生成的文件里自动加上,你自己敲的就得自己加
这就是区别还有
重载OnLoad也不是你那样写的