ASP .NET 一、纯asp.net+cookie制作的购物车

缺点，即使使用全局不缓存，仍然后以使用IE中的返回按钮

（1）添加Global.asax,在其中加入以下内容，设置全局不缓存
?
protected void Application_BeginRequest(Object sender, EventArgs e)
{
HttpContext.Current.Response.Cache.SetNoStore();
}
（2）制作产品销售页

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default8.aspx.cs" Inherits="Default8" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DataList ID="DataList1" runat="server" RepeatDirection="Horizontal" RepeatColumns="4" AlternatingItemStyle-Wrap="true" ItemStyle-Width="100">
        <ItemTemplate>
            <asp:Image ID="Image2" runat="server" ImageUrl='<%# DataBinder.Eval(Container.DataItem,"product_pic") %>' /><br>
            <asp:Label ID="Label1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"product_name") %>'></asp:Label><br>
            <asp:Label ID="Label2" runat="server" Text='<%# DataBinder.Eval(Container.DataItem,"product_price") %>'></asp:Label><br>
            <asp:Label ID="Label3" runat="server" Visible="false" Text='<%# DataBinder.Eval(Container.DataItem,"product_id") %>'></asp:Label><br>
            <asp:TextBox ID="TextBox1" runat="server" Width='35' MaxLength="3" Text="1">1</asp:TextBox>件
            <asp:LinkButton ID="LinkButton1" runat="server" OnCommand="Button1_Command" CommandName='<%# DataBinder.Eval(Container.DataItem,"product_id") %>'>购买</asp:LinkButton>
        </ItemTemplate>
        </asp:DataList></div>
        <asp:Button ID="Button1" runat="server" Text="清空购物车" onclick="Button1_Click" />
    </form>
    <p><a href="shopcar.aspx">我的购物车(最多20条数据)</a></p>

</body>
</html>

为产品销售页添加代码：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default8 : System.Web.UI.Page
{
database db = new database();
HttpCookie cok = null;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            this.DataList1.DataSource = db.select_db("select * from product_list");
            this.DataList1.DataBind(); //Convert.ToString();
        }

    }
    protected void Button1_Command(object sender, CommandEventArgs e)
    {
        //标识产品的数量 www.zzzyk.com
        int num = 1;
        LinkButton lb = (LinkButton)sender;
        string str = lb.ClientID;
        string[] str2 = str.Split('_');
        str2[1] = str2[1].Substring(3, str2[1].Length - 3);
        int i = int.Parse(str2[1]);
        if (((TextBox)this.DataList1.Items[i].FindControl("TextBox1")).Text.Trim().Length != 0)
        {
            num = int.Parse(((TextBox)this.DataList1.Items[i].FindControl("TextBox1")).Text);
        }

        if (Request.Cookies["CarInfo"] == null)
        {
            cok = new HttpCookie("CarInfo");
            cok.Expires = DateTime.Now.AddDays(2);
            Response.AppendCookie(cok);
        }

cok = Request.Cookies["CarInfo"];

        if (cok.Values.Count >= 20)
        {
            Response.Write("购物车已满！");
        }

        //这里是检查购物车里是否有这个物品，如果有，则累加
        if (cok.Values[e.CommandName] == null)
        {
            cok.Values.Add(e.CommandName, num.ToString());
        }
        else
        {
            cok.Values[e.CommandName] = int.Parse(cok.Values[e.CommandName].ToString()) + num + "";
        }

        cok.Expires = DateTime.Now.AddDays(2);
        Response.AppendCookie(cok);

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (Request.Cookies["CarInfo"] == null)
        {
            return;
   &

补充：Web开发 , ASP.Net ,