检查cookie存在 [英] Check if Cookie Exists

问题描述

从上快速搜索的堆栈溢出的我看到人们暗示的检查方式如下如果cookie存在：

From a quick search on Stack Overflow I saw people suggesting the following way of checking if a cookie exists:

HttpContext.Current.Response.Cookies["cookie_name"] != null

或（在页类）：

this.Response.Cookies["cookie_name"] != null

然而，当我尝试使用索引（或Cookies.Get法）来检索一个cookie不存在，似乎真正的创建默认的cookie的名称和返回如此，这样无论我用什么cookie的名称它永远不会返回null。 （甚至更糟 - 创建不必要的cookie）

However, when I try to use the indexer (or the Cookies.Get method) to retrieve a cookie that does not exist it seems to actually create a 'default' cookie with that name and return that, thus no matter what cookie name I use it never returns null. (and even worse - creates an unwanted cookie)

难道我在这里做得不对，或者是有名字的特定的Cookie是否存在等检查只是以不同的方式？

Am I doing something wrong here, or is there a different way of simply checking for the existance of a specific cookie by name?

推荐答案

Response.Cookies包含将被发送回浏览器的cookie。如果你想知道一个Cookie是否存在，你应该看看Request.Cookies时。

Response.Cookies contains the cookies that will be sent back to the browser. If you want to know whether a cookie exists, you should probably look into Request.Cookies.

总之，要查看是否有cookie存在，你可以检查的 Cookies.Get（串）。 然而，如果你使用Response对象这个方法和饼干的不的存在，那么该cookie将被创建。

Anyway, to see if a cookie exists, you can check Cookies.Get(string). However, if you use this method on the Response object and the cookie doesn't exist, then that cookie will be created.

请参见 HttpCookieCollection.Get方法MSDN参考（字符串）

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