C# HttpWebRequest: 添加 Cookie 到 CookieContainer -> ArgumentException (Parametername: cookie.Domain)
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HttpWebRequest: Add Cookie to CookieContainer -> ArgumentException (Parametername: cookie.Domain)
提问by TorbenJ
I'm trying to login to a website via my application. What I did:
我正在尝试通过我的应用程序登录网站。我做了什么：
First I figured out how the browser does the authorization process with Fiddler. I examined how the POST request is built and I tried to reconstruct it. The browser sends 4 cookies (Google Analytics) and I tried to set them:
首先，我想出了浏览器如何使用 Fiddler 进行授权过程。我检查了 POST 请求是如何构建的，并尝试重建它。浏览器发送 4 个 cookie（谷歌分析），我尝试设置它们：
CookieContainer gaCookies = new CookieContainer();
gaCookies.Add(new Cookie("__utma", "#########.###########.##########.##########.##########.#"));
gaCookies.Add(new Cookie("__utmb", "#########.#.##.##########"));
gaCookies.Add(new Cookie("__utmc", "#########"));
gaCookies.Add(new Cookie("__utmz", "#########.##########.#.#.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)"));
(just replaced the original cookie data with #)
（只是用#替换了原来的cookie数据）
Then I went through the code with the debugger and as soon as the first gaCookies.Add is executed, the application stops with an
然后我用调试器检查了代码，一旦第一个 gaCookies.Add 被执行，应用程序就会停止
System.ArgumentException: The parameter '{0}' cannot be an empty string. Parameter name: cookie.Domain
I would like to know why this happens. The constructor of Cookie doesn't require a domain and I don't know where I can get this value?
我想知道为什么会发生这种情况。Cookie 的构造函数不需要域，我不知道从哪里可以获得这个值？
Would be very great if someone of you could help me with this.
I'm not a webdeveloper or an expert in web stuff so I don't know much about it.
Is there maybe a great source where I can learn about this if there is no "short and quick answer"?
如果你们中有人能帮我解决这个问题，那就太好了。
我不是网络开发人员或网络方面的专家，所以我对此知之甚少。
如果没有“简短而快速的答案”，是否有一个很好的来源可以让我了解这一点？
采纳答案by Ichabod Clay
CookieContainers can hold multiple cookies for different websites, therefor a label (the Domain) has to be provided to bind each cookie to each website. The Domain can be set when instantiating the individual cookies like so:
CookieContainers 可以为不同的网站保存多个 cookie，因此必须提供一个标签（域）来将每个 cookie 绑定到每个网站。可以在实例化单个 cookie 时设置域，如下所示：
Cookie chocolateChip = new Cookie("CookieName", "CookieValue") { Domain = "DomainName" };
An easy way to grab the domain to is to make a Uri(if you aren't using one already) that contains your target url and set the cookie's domain using the Uri.Hostproperty.
获取域的一种简单方法是创建一个Uri（如果您还没有使用）包含您的目标 url 并使用该Uri.Host属性设置 cookie 的域。
CookieContainer gaCookies = new CookieContainer();
Uri target = new Uri("http://www.google.com/");
gaCookies.Add(new Cookie("__utmc", "#########") { Domain = target.Host });
