Question

我创建了一个cookie并且它具有正确的到期日设置，但是当我去更新cookie并使用调试器检查它时，到期时间已经消失。发生了什么事？

' Cookie Helper: Updates cookie with the selected source ids
Protected Sub UpdateCookieFor(ByVal cookieName As String, ByVal sourceIds As String)

    ' Update cookie if it exists
    If Request.Cookies(cookieName) IsNot Nothing Then
        Response.Cookies(cookieName).Value = sourceIds
    End If

End Sub


' Cookie Helper: Create cookie
Protected Sub CreateCookie(ByVal cookieName As String, ByVal sourceIds As String)

    ' Create cookie if it does not exist
    If Request.Cookies(cookieName) Is Nothing Then
        Response.Cookies(cookieName).Value = sourceIds
        Response.Cookies(cookieName).Expires = DateTime.Now.AddYears(10)
    End If

End Sub

Answer 1

我今天刚遇到这个问题（使用C＃）。显然，到期时间从未从浏览器发送到服务器，因此您始终必须设置该值。我在MSDN上阅读了这篇文章：

http://msdn.microsoft.com/en-us/library/aa289495(v=vs.71).aspx#vbtchaspnetcookies101anchor8

请参阅“过期是什么？”部分。

我能够通过在cookie中设置原始到期日期的值来解决这个问题，因此它将被发送到服务器。

HttpCookie myCookie = new HttpCookie(Constants.CookieName);
myCookie.Expires = DateTime.Now.AddDays(numberOfdaysToExpireCookie);
myCookie["MyKey"] = myValue;
myCookie["MyExpiry"] = myCookie.Expires.Ticks.ToString();
HttpContext.Current.Response.Cookies.Add(myCookie);

然后，在更新cookie时，我会阅读原始到期日并再次写出来。

//Get the expiry date that was stored
string cookieExpiryDateValue = myCookie.Values["MyExpiry"];
long ticks;
DateTime expiryDate = DateTime.Now.AddDays(numberOfdaysToExpireCookie);
if(long.TryParse(cookieExpiryDateValue, out ticks)){
    expiryDate = new DateTime(ticks);
}

//Update the value in the cookie.  Persist the expiry and domain
HttpCookie responseCookie = HttpContext.Current.Response.Cookies[Constants.CookieName];
responseCookie.Values["MyKey"] = cookieValues;
responseCookie.Values["MyExpiry"] = cookieExpiryDateValue;
responseCookie.Expires = expiryDate;

为什么cookie到期消失了？

1 个答案: