C# 重复刷新不增加次数利用cookie

1. var oldCookie = Request.Cookies["newsCookie"];  
2.   
3.                 if (oldCookie == null)  
4.                 {  
5.                     var newsCookie = new HttpCookie("newsCookie");  
6.                     newsCookie.Expires = DateTime.Now.Date.AddDays(1);  
7.                     newsCookie.Values.Add("" + newsId + "", "'" + newsId + "'");  
8.                     Response.SetCookie(newsCookie);  
9.                     model.ClickCount = model.ClickCount + 1;  
10.                     _newsService.Update(model);  
11.                 }  
12.                 else  
13.                 {  
14.                     if (oldCookie["" + newsId + ""] == null)  
15.                     {  
16.                         oldCookie.Values.Add("" + newsId + "", "'" + newsId + "'");  
17.                         Response.AppendCookie(oldCookie);  
18.                         model.ClickCount = model.ClickCount + 1;  
19.                         _newsService.Update(model);  
20.                     }  
21.                 }  

or

//判断Cookie是否存在

        if (Request.Cookies["ipname"] == null)

        {

            Response.Cookies["ipname"].Value = "其实没意义";

            Response.Cookies["ipname"].Expires = DateTime.Now.AddSeconds(4);

            //初始化 Application["counter"]

            if (Application["counter"] == null)

            {

                Application["counter"] = 1;

            }

            else

            {

                Application.Lock();

                Application["counter"] = Convert.ToInt32(Application["counter"]) + 1;

                Application.UnLock();

            }

        }

        lblAccessCount.Text = "您是第" + Application["counter"] + "位访问者！";