（转）用cookie保存浏览记录 （转载：http://blog.csdn.net/keyake863/archive/2008/03/31/2233404.a

当页面初始化时需要判断是否存在

        protected void Page_Load(object sender, EventArgs e)
        {
                if (Request.Cookies["username"] == null)
                {
                    HttpCookie myCookie = new HttpCookie("username");
                    myCookie.Values.Add("prodid", "");
                    myCookie.Expires = DateTime.Now.AddDays(1);
                    Response.Cookies.Add(myCookie);
                }
        }

这是插入cookie的代码

 public void addcookie(string cookievalue)
        {
           
            HttpCookie cookie = new HttpCookie("username");
            if (Request.Cookies["username"].Values["prodid"] != "")
            {
                string myvalue = "";
                myvalue = Request.Cookies["username"].Values["prodid"].ToString();
                myvalue = cookievalue + "," + myvalue;
                cookie.Values.Add("prodid", myvalue);
                cookie.Expires = DateTime.Now.AddDays(1);
                Response.Cookies.Add(cookie);
            }
            else
            {
                cookie.Values.Add("prodid", cookievalue);
                cookie.Expires = DateTime.Now.AddDays(1);
                Response.Cookies.Add(cookie);
            }
        }
读取cookie代码，只读取最后三条记录

        public void playcookie()
        {
            int num = 0;
            string myvalue = "";
            myvalue = Request.Cookies["username"].Values["prodid"].ToString();
            string resultvalue=string.Empty;
            if (myvalue != "")
            {
                Char[] spitchar = new Char[] ...{ Convert.ToChar(",") };
                string[] cookievalue;
                cookievalue = myvalue.Split(spitchar);
                if (cookievalue.Length <= 3)
                {
                    num = cookievalue.Length;
                }
                else
                {
                    num = 3;
                }
                for (int i = 0; i < num; i++)
                {
                    resultvalue += cookievalue[i].ToString();
                }
                Label1.Text = resultvalue;
            }
        }
最后是删除cookie的方法

        protected void Button2_Click(object sender, EventArgs e)
        {
            HttpCookie myCookie = new HttpCookie("username");
            myCookie.Expires = DateTime.Now.AddDays(-1d);
            Response.Cookies.Add(myCookie);
        }

本文完，代码不多，也许测试用例未做过多测试，就当抛砖引玉，本文有科雅客原创，未经许可切勿转载

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