cs类 添加cookie

Question

在cs类中
获取cookie
若为null则添加
否则修改原cookie值引用http://blog.sina.com.cn/s/blog_5ff9cc430100i17c.html
CookiesHelper操作类
在HttpResponse response = HttpContext.Current.Response;
总是null
该类 后来继承了 System.Web.UI.Page
一样不行
---------------------------------------------------------
我的想法是程序变动塞值
页面js 秒判 值是否变动
否则刷新该页面
现在测试在aspx 的类文件中 添加没问题
只是在单纯的cs类文件中 的操作 报HttpContext.Current.Response=null
页面js 的秒判 cookie值 也能获得求达人释疑
单纯的cs类文件 操作cookie为何不行

Answer 1

http://www.cnblogs.com/zhongweiv/archive/2011/11/08/Cookies.html

Answer 2

HttpContext.Current.Request.Cookies[x]
得到

Answer 3

HttpContext.Current.Response.Cookies.Set(New HttpCookie("baidu"))如果 cookie》baidu 已存在  自动覆盖  否则新增

Answer 4

c# 是
HttpContext.Current.Response.Cookies.Set(new HttpCookie("baidu"));

Answer 5

HttpCookie cookie = HttpContext.Current.Response.Cookies[cookieName];
if (cookie != null)
{
    if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
        cookie.Values.Set(key, value);
    else
        if (!string.IsNullOrEmpty(value))
            cookie.Value = value;
    if (expires != null)
        cookie.Expires = expires.Value;
    HttpContext.Current.Response.SetCookie(cookie);
}
现在改成这样
HttpCookie cookie = HttpContext.Current.Response.Cookies[cookieName];
就报错 跳异常了 不行啊

Answer 6

HttpCookie cookie = HttpContext.Current.Response.Cookies[cookieName];
if (cookie != null)
{
  if (!string.IsNullOrEmpty(key) && cookie.HasKeys)
  cookie.Values.Set(key, value);
  else
  if (!string.IsNullOrEmpty(value))
  cookie.Value = value;
  if (expires != null)
  cookie.Expires = expires.Value;
  HttpContext.Current.Response.SetCookie(cookie);
}
现在改成这样
HttpCookie cookie = HttpContext.Current.Response.Cookies[cookieName];
就报错 跳异常了 不行啊

Answer 7

不是该方法的问题
是cs类 操作cookie时
HttpCookie cookie = HttpContext.Current.Response.Cookies[cookieName];
HttpResponse response = HttpContext.Current.Response;
就开始跳异常
继承System.Web.UI.Page 也没用

Answer 8

HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];Response.Cookies换了页面就没有了不是早告诉你了吗

Answer 9

Request.Cookies 和 Response.Cookies 的区别

Answer 10

using System;
using System.Web;namespace DotNet.Utilities
{
    public class CookieHelper
    {
        /// <summary>
        /// 清除指定Cookie
        /// </summary>
        /// <param name="cookiename">cookiename</param>
        public static void ClearCookie(string cookiename)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookiename];
            if (cookie != null)
            {
                cookie.Expires = DateTime.Now.AddYears(-3);
                HttpContext.Current.Response.Cookies.Add(cookie);
            }
        }
        /// <summary>
        /// 获取指定Cookie值
        /// </summary>
        /// <param name="cookiename">cookiename</param>
        /// <returns></returns>
        public static string GetCookieValue(string cookiename)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[cookiename];
            string str = string.Empty;
            if (cookie != null)
            {
                str = cookie.Value;
            }
            return str;
        }
        /// <summary>
        /// 添加一个Cookie（24小时过期）
        /// </summary>
        /// <param name="cookiename"></param>
        /// <param name="cookievalue"></param>
        public static void SetCookie(string cookiename, string cookievalue)
        {
            SetCookie(cookiename, cookievalue, DateTime.Now.AddDays(1.0));
        }
        /// <summary>
        /// 添加一个Cookie
        /// </summary>
        /// <param name="cookiename">cookie名</param>
        /// <param name="cookievalue">cookie值</param>
        /// <param name="expires">过期时间 DateTime</param>
        public static void SetCookie(string cookiename, string cookievalue, DateTime expires)
        {
            HttpCookie cookie = new HttpCookie(cookiename)
            {
                Value = cookievalue,
                Expires = expires
            };
            HttpContext.Current.Response.Cookies.Add(cookie);
        }
    }
}

Answer 11

我报错的原因是 单纯的cs类文件里
想要把值塞进去 可每次都是添加的时候 报
未将对象引用设置到对象的实例
HttpContext.Current.Response跟踪监视值为null
怎么回事啊 进不去 HttpCookie cookie 值都塞进去了

Answer 12

HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
if (cookie == null)
{
 cookie = new HttpCookie("cookieName");
}
cookie.Value = value;
cookie.Expires = DateTime.Now.AddDays(100);
cookie.Path = "/";
HttpContext.Current.Response.Cookies.Add(cookie);

Answer 13

HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
if (cookie == null)
{
 cookie = new HttpCookie("cookieName");
}
cookie.Value = value;
cookie.Expires = DateTime.Now.AddDays(100);
cookie.Path = "/";
HttpContext.Current.Response.Cookies.Add(cookie);