ASP MVC Cookie不持续 [英] ASP MVC Cookies not persisting

问题描述

我有一个ASP MVC应用程序与一些看似简单的代码来保存和检索Cookie，但由于某种原因，他们不会持久。控制器中的代码是：

I have a ASP MVC App with some seemingly simple code to save and retrieve cookies but for some reason they won't persist. The code in the controller is :

if (System.Web.HttpContext.Current.Response.Cookies["CountryPreference"] == null)
{
    HttpCookie cookie = new HttpCookie("CountryPreference");
    cookie.Value = country;
    cookie.Expires = DateTime.Now.AddYears(1);
    System.Web.HttpContext.Current.Response.Cookies.Add(cookie);
}

并重新加载：

if (System.Web.HttpContext.Current.Request.Cookies["CountryPreference"] != null)
{
    System.Web.HttpContext.Current.Request.Cookies["CountryPreference"].Expires = DateTime.Now.AddYears(1);
    data.Country = System.Web.HttpContext.Current.Request.Cookies["CountryPreference"].Value;
}

由于某种原因，Cookie总是空的？

For some reason the cookie is always null?

推荐答案

问题出在以下代码中：

if (System.Web.HttpContext.Current.Response.Cookies["CountryPreference"] == null)

当您尝试使用Response对象而不是请求检查cookie的存在时，ASP.net自动创建一个cookie。

When you try to check existence of a cookie using Response object rather than Request, ASP.net automatically creates a cookie.

请在这里查看详细的文章： http://chwe.at/blog/post/2009/01/26/Done28099t-use-ResponseCookiesstring-to-check- if-a-cookie-exists！.aspx

Check this detailed post here: http://chwe.at/blog/post/2009/01/26/Done28099t-use-ResponseCookiesstring-to-check-if-a-cookie-exists!.aspx

如果链接失效，再次....

Quote from the article in case the link goes down again ....

简短的解释，如果你不是
喜欢读整个故事

The short explanation, if you don’t like to read the entire story

如果你使用像if
（Response.Cookies [mycookie]！= null）
{...}，ASP.Net自动
在后台生成一个名为
mycookie的新cookie，
覆盖旧的cookie！始终使用
Request.Cookies-Collection读取
cookie！

If you use code like "if (Response.Cookies["mycookie"] != null) { … }", ASP.Net automatically generates a new cookie with the name "mycookie" in the background and overwrites your old cookie! Always use the Request.Cookies-Collection to read cookies!

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