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(1,0,0,0);//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","1203");
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"] = "2";
Response.Cookies["Info"].Expires = DateTime.Now.AddDays(1);

删除cookie下的属性
HttpCookie acookie=Request.Cookies["Info"];
acookie.Values.Remove("userid");
acookie.Expires = DateTime.Now.AddDays(1);
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 - 1;
for(int i=0;i<limit;i++)
{
　　acookie = Request.Cookies(i)
　　acookie.Expires = DateTime.Now.AddDays(-1)
　　Response.Cookies.Add(acookie)
}