cookie 的操作

一、添加cookie
1 HttpCookie cookie = new HttpCookie("Info"); //定义cookie对象以及名为Info的项 
2 cookie.Expires.AddDays(7);              //添加作用时间   
3 cookie.Values.Add("user","cxbkkk");          //增加属性 
4 cookie.Values.Add("userid","1203"); 
5 Response.AppendCookie(cookie);               //确定写入cookie中    

二、读取cookie 
1 if(Request.Cookies["Info"]!=null)            //   读取cookie

2 { 
3     string temp=Convert.ToString(Request.Cookies["Info"].Values["user"])+"；"+Convert.ToString(Request.Cookies["Info"].Values["userid"]); 
4     //读全部就用Request.Cookies["Info"].Value) 
5     if(temp=="") 
6     { 
7         Response.Write("空"); 
8     } 
9     else 
10         Response.Write(temp); 
11 } 
12 else 
13 { 
14     Response.Write("error"); 
15 }

三、修改cookie 
1 Response.Cookies["Info"]["user"] = "2";          // 修改cookie 
2 Response.Cookies["Info"].Expires = DateTime.Now.AddDays(1);      

四、删除cookie下的属性
1 HttpCookie acookie=Request.Cookies["Info"]; 
2 acookie.Values.Remove("userid");                 //  删除cookie下的属性 
3 acookie.Expires = DateTime.Now.AddDays(1); 
4 Response.Cookies.Add(acookie);       

五、删除所有cookie，就是设置过期时间为现在就行了 
1 int limit=Request.Cookies.Count - 1; 
2 for(int i=0;i<limit;i++) 
3 { 
4     acookie = Request.Cookies(i) 
5     acookie.Expires = DateTime.Now.AddDays(-1) 
6     Response.Cookies.Add(acookie) 
7 }