I have a cookie called SurveyCookie. Created like so:
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);
Which works great. Now the problem comes when I want to change the value "surveyPage" like so.
The below will create a new cookie which is not what I want.
int cookieValue = Convert.ToInt32(Request.Cookies["SurveyCookie"]["surveyPage"]) + 1;
Response.Cookies["SurveyCookie"]["surveyPage"] = cookieValue.ToString();
Then I tried this code below which doesn't work either. The surveyPage is still 1 when it should be 2.
Request.Cookies["SurveyCookie"]["surveyPage"] = cookieValue.ToString();
Since neither of the above works what does change the cookies value for surveyPage?
Best Answer-推荐答案
From ASP.NET Cookies Overview:
You cannot directly modify a cookie. Instead, changing a cookie
consists of creating a new cookie with new values and then sending the
cookie to the browser to overwrite the old version on the client.
You can try this:
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);
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