Cookies无法保存，浏览器没有问题，顶也有分

Question

每次刷新页面，判断HttpContext.Current.Response.Cookies["CityCookie"].Value都是null，代码如下：if (HttpContext.Current.Response.Cookies["CityCookie"].Value == null)
            {
                HttpContext.Current.Response.Cookies["CityCookie"].Value = "全国";
                HttpContext.Current.Response.Cookies["CityCookie"].Expires = DateTime.Today.AddDays(365);            }

Answer 1

http://www.cnblogs.com/cyq1162/archive/2006/11/22/568934.html

Answer 2

cookies只要一离开本页就过期，怎么办呢

Answer 3

HttpCookie httpcookie=new HttpCookie("userName","forever10");
httpcookie.expires=datetime.now.adddats(1000000)
httpcookie.domain="xx.com";
Response.cookies.add(httpcookie)

Answer 4

HttpContext.Current.Response.Cookies["CityCookie"].Value == null
如果cookies中一开始有值，这句话就不成立，赋值肯定不成功；你可以检查一下看看有没有值再看怎么解决。
cookies只要一离开本页就过期的问题，你可以建立永久cookies或者设定cookies过期时间，或者你的浏览器中的设定cookies过期时间的问题，你可以查查资料解决

Answer 5

HttpContext.Current.Response.Cookies["CityCookie"].Value == null的判断有点小矛盾我觉得应该是 
HttpContext.Current.Response.Cookies["CityCookie"] == null
{
HttpCookie cookie = new HttpCookie("CityCookie");//添加cookie
cookie.Values.Add("CityCookie","全国");//增加属性
cookie.Expires = DateTime.Now.AddDays(365); 
}