webform 对表的增删改查

增删改查的方法代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class xiugai : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string id = Request["code"].ToString();
        Car data = new CarBf().Select(id);
        Session["car"] = data;
        TextBox1.Text = data.Code;
        TextBox2.Text = data.Name;
        TextBox3.Text = data.Price.ToString();
        }
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        //在这里用session接收要修改的数据，不能再这里new一个新对象
        Car data = (Car)Session["car"];
        data.Code = TextBox1.Text;
        data.Name = TextBox2.Text;
        data.Price = Convert.ToDecimal(TextBox3.Text);

        new CarBf().Update(data);
        Response.Redirect("Car.aspx");

    }
}

主界面里的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Car1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        List<Car> list = new CarBf().Select();

        string s = " <table width=' 100%'  border='1'><tr class='tr1'><td>编号</td><td>名称</td><td>价格</td><td>操作</td></tr>";
        foreach (Car data in list)
        {
            s+=" <tr class='tr2'><td>"+data.Code+"</td><td><a href='xianshi.aspx?code="+data.Code+"'>"+data.Name+"</a></td><td>"+data.Price+ "</td><td><a href='Delete.aspx?code=" + data.Code + "'>删除</a><a href='Update.aspx?code=" + data.Code + "'>修改</a></td></tr>";
        }
        s+="</table><a href='Insert.aspx'>添加<a/>";
        Literal1.Text=s;
    }
}

修改代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class xiugai : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string id = Request["code"].ToString();
        Car data = new CarBf().Select(id);
        Session["car"] = data;
        TextBox1.Text = data.Code;
        TextBox2.Text = data.Name;
        TextBox3.Text = data.Price.ToString();
        }
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        //在这里用session接收要修改的数据，不能再这里new一个新对象
        Car data =new Car();
        data.Code = TextBox1.Text;
        TextBox1.Enabled = false;
        data.Name = TextBox2.Text;
        data.Price = Convert.ToDecimal(TextBox3.Text);

        new CarBf().Update(data);
        Response.Redirect("Car.aspx");

    }
}