C#基于cookie实现的购物车功能

HttpCookie cookie = new HttpCookie("shop");//cookie.values集合能够存储多个键值对，其中add方法的第一个参数是商品编号，第二个参数是商品名称和价格，中间用都好分隔。cookie.Values.Add("1", "电脑,2000");cookie.Values.Add("2", "电视,2200");cookie.Values.Add("3", "冰箱,2300");cookie.Expires = DateTime.Now.AddDays(1);Response.Cookies.Add(cookie);

/// <summary>/// 显示购物车/// </summary>/// <param name="sender"></param>/// <param name="e"></param>protected void Button2_Click(object sender, EventArgs e){  LoadShop();}//显示购物车private void LoadShop(){  //首先判断名称为"shop"的cookie是否存在  if (Request.Cookies["shop"] != null)  {    HttpCookie cookie = Request.Cookies["shop"];    StringBuilder sb = new StringBuilder();    sb.Append("<table>");    //便利此cookie的values集合，取出每一个键值对    for (int i = 0; i < cookie.Values.Count; i++)    {      sb.Append("<tr>");      sb.Append("<td>");      sb.Append("<a href=WebForm5.aspx?id=" + cookie.Values.AllKeys[i] + ">删除<a/>");      sb.Append("</td>");      sb.Append("<td>");      //获取每个键值对中的值      string[] shops = cookie.Values[i].Split(',');      //获取商品名称      sb.Append("<td>" + shops[0] + "</td>");      //获取商品价格      sb.Append("<td>" + shops[1] + "</td>");      sb.Append("</td>");      sb.Append("</tr>");    }    sb.Append("</table>");    mydiv.InnerHtml = sb.ToString();  }}

protected void Page_Load(object sender, EventArgs e){  if (!IsPostBack)  {    if (!string.IsNullOrEmpty(Request.QueryString["id"]))    {      string id = Request.QueryString["id"];      DeleteShop(id);    }  }}private void DeleteShop(string id){  if (Request.Cookies["shop"] != null)  {    HttpCookie cookie = Request.Cookies["shop"];    cookie.Values.Remove(id);    if (cookie.Values.Count == 0)    {      cookie.Expires = DateTime.Now.AddDays(-1);    }    Response.Cookies.Add(cookie);    LoadShop();  }}