aspx page state management cookie and ViewState_html/css_WEB-ITnose

1. Cookie
   1. Set cookie

      protected void Button2_Click(object sender, EventArgs e)        {            HttpCookie cookie = new HttpCookie("user");            cookie.Value = "这是cookie";            cookie["sex"] = "女";            cookie.Values.Add("age", "18");            cookie.Expires = DateTime.Now.AddHours(1);            Response.AppendCookie(cookie);//将Cookie追加到内部cookie            //Response.Cookies.Add(cookie);//跟上面一样        }

      2 Get Cookie

      protected void Button1_Click(object sender, EventArgs e)        {            //获取客户端发送的Cookie            HttpCookie cookie1 = Request.Cookies["user"];            if (cookie1 == null)            {                Response.Write("木有发现cookie");            }            else            {                Response.Write("cooki值为:"+cookie1.Value+"<br/>");                Response.Write("sex值为:"+cookie1["sex"]+"<br/>");                Response.Write("age值为:"+cookie1["age"]+"<br/>");            }        }

      3, delete cookies

      //将cookie有效期设置为过去某个时间,浏览器会检查自动删除            HttpCookie cookie = Request.Cookies["user"];            cookie.Expires = DateTime.Now.AddHours(-1);

      1. 1. Rendering
   2. Reading cookies across domains
      1. Cookies from different domains cannot be shared. If the site has subdomains (baiyun.com and sell, baiyun.com), you can set the Domain attribute of the cookie

         cookie.Domain="baiyun.com";cookie.Domain="sell.baiyun.com";

         so that the cookie can be used for the main domain and subdomains

2. When viewing the source code on the web page, there is a hidden field of _VIEWSTATE which is: 1. The existence of the client will reduce the pressure on the server 2. It is inherently limited and can only save objects that can be serialized; 3. If it is too large, the transmission speed will be slow and increase the server's parsing burden; 4. You can use LosFormatter to get the ViewState deserialized object, which has poor security; 5. It can be turned off to improve performance (EnableViewState="false")