aspx页面状态管理Cookie和ViewState

1. Cookie
   1. 设置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
      
              }

      View Code

      2获取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/>");
      
                  }
      
              }

      View Code

      3,删除cookie

      

      //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);

      View Code

      

      1. 1. 效果图
   2. 跨域读取Cookie
      1. 不同域的Cookie无法共享,如果站点有子域(baiyun.com和sell,baiyun.com),可以设置cookie的Domain属性
         

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

         View Code

         这样cookie就能用于主域和子域了

2. 网页查看源代码的时候有个_VIEWSTATE的隐藏字段就是:1.存在客户端,会减轻服务器压力2.本身限制,只能保存可以序列化的对象;3,过大会传输速度慢,增加服务器解析负担;4,可以用LosFormatter得到ViewState反序列化后的对象,安全性差;5,可以关闭以提高性能(EnableViewState="false")