[英]Change a cookie value of a cookie that already exists
我有一个名为 SurveyCookie 的 cookie。 像这样创建:
var cookie = new HttpCookie("SurveyCookie");
cookie.Values["surveyPage"] = "1";
cookie.Values["surveyId"] = "1";
cookie.Values["surveyTitle"] = "Definietly not an NSA Survey....";
cookie.Values["lastVisit"] = DateTime.UtcNow.ToString();
cookie.Expires = DateTime.UtcNow.AddDays(30);
Response.Cookies.Add(cookie);
这很好用。 现在,当我想像这样更改“surveyPage”值时,问题就来了。
下面将创建一个新的 cookie,这不是我想要的。
int cookieValue = Convert.ToInt32(Request.Cookies["SurveyCookie"]["surveyPage"]) + 1;
Response.Cookies["SurveyCookie"]["surveyPage"] = cookieValue.ToString();
然后我尝试了下面的这段代码,它也不起作用。 当应该是 2 时,surveyPage 仍然是 1。
Request.Cookies["SurveyCookie"]["surveyPage"] = cookieValue.ToString();
由于以上都不起作用,什么会改变surveyPage的cookies值?
您不能直接修改 cookie。 相反,更改 cookie 包括使用新值创建新 cookie,然后将 cookie 发送到浏览器以覆盖客户端上的旧版本。
你可以试试这个:
HttpCookie cookie = Request.Cookies["SurveyCookie"];
if (cookie == null)
{
// no cookie found, create it
cookie = new HttpCookie("SurveyCookie");
cookie.Values["surveyPage"] = "1";
cookie.Values["surveyId"] = "1";
cookie.Values["surveyTitle"] = "Definietly not an NSA Survey....";
cookie.Values["lastVisit"] = DateTime.UtcNow.ToString();
}
else
{
// update the cookie values
int newSurveyPage = int.Parse(cookie.Values["surveyPage"]) + 1;
cookie.Values["surveyPage"] = newSurveyPage.ToString();
}
// update the expiration timestamp
cookie.Expires = DateTime.UtcNow.AddDays(30);
// overwrite the cookie
Response.Cookies.Add(cookie);
每次需要修改现有 cookie 时,您都应该始终创建一个新 cookie,以下对我有用:
var cookie = new System.Web.HttpCookie("SurveyCookie");
cookie.Values["surveyPage"] = newValue;
cookie.Expires = DateTime.Now.AddDays(1000);
cookie.SameSite = System.Web.SameSiteMode.None;
cookie.Secure = true;
this.HttpContext.Response.Cookies.Add(cookie);
查看Response.SetCookie()
方法,因为这将设置更新您现有的 cookie
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