ASP.NET - cookie

 下面是写cookie
 HttpCookie cookie = new HttpCookie("Info");//定义cookie对象以及名为Info的项
 DateTime dt = DateTime.Now;//定义时间对象
 TimeSpan ts=new TimeSpan(,,,);//cookie有效作用时间，具体查msdn
 cookie.Expires = dt.Add(ts);//添加作用时间
 cookie.Values.Add("user","cxbkkk");//增加属性
 cookie.Values.Add("userid","");
 Response.AppendCookie(cookie);//确定写入cookie中 


 读取cookie
 if(Request.Cookies["Info"]!=null)
 {
 　　string temp=Convert.ToString(Request.Cookies["Info"].Values["user"])+" "+Convert.ToString(Request.Cookies["Info"].Values["userid"]);
 　　//读全部就用Request.Cookies["Info"].Value
 }
 if(temp=="")
 {
 　　Response.Write("空");
 }
 else
 　　Response.Write(temp);
 }
 else
 {
　　Response.Write("error");
 }


修改cookie
Response.Cookies["Info"]["user"] = "";
Response.Cookies["Info"].Expires = DateTime.Now.AddDays();


删除cookie下的属性
HttpCookie acookie=Request.Cookies["Info"];
acookie.Values.Remove("userid");
acookie.Expires = DateTime.Now.AddDays();
Response.Cookies.Add(acookie); 


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