CookieContainer混乱

据我所知，CookieContainer通过HttpWebRequests持久化Cookie的基本用法如下：

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); CookieContainer cookies = new CookieContainer(); request.CookieContainer = cookies; using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { // Do stuff with response } 

然后：

 request = (HttpWebRequest)WebRequest.Create(new url); request.CookieContainer = cookies; etc... 

但我无法理解这个过程背后的逻辑。 变量cookie在初始化后似乎没有被重新分配。 第一个WebResponse的cookie到底是如何进入第二个WebRequest的？

Answer 1

这是因为当您从网站检索响应时，它会自动填充您用于请求的cookie容器。 您可以通过查看响应之前和之后存在的cookie来测试它：

 //Build the request Uri site = new Uri("http://www.google.com"); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(site); CookieContainer cookies = new CookieContainer(); request.CookieContainer = cookies; //Print out the number of cookies before the response (of course it will be blank) Console.WriteLine(cookies.GetCookieHeader(site)); //Get the response and print out the cookies again using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) { Console.WriteLine(cookies.GetCookieHeader(site)); } Console.ReadKey();