c#的cookie操作-HttpCookie

添加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";//修改后cookie "Info"只含有user=2这个属性
 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)
 }