blocks|key|2390755|text|如果不提供有关此站点如何处理身份验证的更多详细信息，则无法回答您的问题。仅仅说像google这样的网站是不够的。例如，Google提供了一个API来实现这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2390756|现在，让我们假设这个站点使用cookie来跟踪经过身份验证的用户。下面是所涉及的过程的概述。您可以使用HttpWebRequest的CookieContainer属性。因此，您将向页面发送第一个请求，允许通过发送用户名/密码进行身份验证。然后，cookie容器将捕获身份验证cookie，并在后续请求下载文件时发送该cookie。|offset|length|2390757|和带代码的插图：|2390758|var+container+=+new+CookieContainer();

var+request+=+(HttpWebRequest)WebRequest.Create("https://example.com/login");
request.Method+=+"POST";
request.ContentType+=+"application/x-www-form-urlencoded";
request.CookieContainer+=+container;
using+(var+stream+=+request.GetRequestStream())
using+(var+writer+=+new+StreamWriter(stream))
{
++++var+values+=+HttpUtility.ParseQueryString(string.Empty);
++++values["password"]+=+"secret";
++++values["username"]+=+"someuser";
++++writer.Write(values.ToString());
}

using+(var+response+=+request.GetResponse())
{
++++//+At+this+stage+if+authentication+went+fine+the+
++++//+cookie+container+should+have+the+authentication+cookie
++++//+allowing+to+track+the+user
}

//+Now+let's+send+a+second+request+to+download+the+file
request+=+(HttpWebRequest)WebRequest.Create("https://example.com/authenticated_resource");
request.CookieContainer+=+container;
request.Method+=+"GET";
using+(var+response+=+request.GetResponse())
using+(var+stream+=+response.GetResponseStream())
{
++++//+TODO:+do+something+with+the+response
}|code-block|syntax|javascript|2390759|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.cookiecontainer.aspx^0|0|1U|F|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

Without providing more details about how this site handles authentication your question is impossible to answer. Just saying a site like google is not enough. For example Google provides an API for doing this.

Now let's imagine that this site uses cookies to track authenticated users. Here's an overview of the process involved. You could use the <a href="http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.cookiecontainer.aspx" rel="nofollow">CookieContainer</a> property of a HttpWebRequest. So you will send a first request to the page allowing to authenticate by sending the username/password. The cookie container will then capture the authentication cookie and it will be sent on subsequent request to download the file.

And illustration with code:

<pre><code>var container = new CookieContainer();

var request = (HttpWebRequest)WebRequest.Create("https://example.com/login");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.CookieContainer = container;
using (var stream = request.GetRequestStream())
using (var writer = new StreamWriter(stream))
{
 var values = HttpUtility.ParseQueryString(string.Empty);
 values["password"] = "secret";
 values["username"] = "someuser";
 writer.Write(values.ToString());
}

using (var response = request.GetResponse())
{
 // At this stage if authentication went fine the 
 // cookie container should have the authentication cookie
 // allowing to track the user
}

// Now let's send a second request to download the file
request = (HttpWebRequest)WebRequest.Create("https://example.com/authenticated_resource");
request.CookieContainer = container;
request.Method = "GET";
using (var response = request.GetResponse())
using (var stream = response.GetResponseStream())
{
 // TODO: do something with the response
}
</code></pre>

blocks|key|2390782|text|我建议使用一些pop或imap组件来检索邮件。例如Open+Pop+.NET。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2390783|entityMap|0|LINK|mutability|MUTABLE|url|http://sourceforge.net/projects/hpop/^0|P|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I would suggest to use some pop or imap component to retrieve mail. For example <a href="http://sourceforge.net/projects/hpop/" rel="nofollow">Open Pop .NET</a>.

blocks|key|4465887|text|这叫做屏幕抓取。您必须发出HTTP请求，在需要提交表单的情况下发布表单数据，然后解析响应。我使用HtmlAgilityPack使这些任务变得更容易，但它不会为您完成所有这些任务……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4465888|在这里看一下：|offset|length|style|BOLD|4465889|http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-1.html|4465890|http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-2.html|4465891|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|7|0|0|22|0|0|0|22|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|L|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|I]]|S|$5|O|P|Q|A|$R|K]]]]

It's called screen scraping. You have to issue HTTP Requests, post form data in cases where you want to submit a form, and then parse the responses. I use HtmlAgilityPack to make these tasks easier, but it won't do it all for you...

Have a look here: 
<a href="http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-1.html" rel="nofollow">http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-1.html</a> 
<a href="http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-2.html" rel="nofollow">http://crazorsharp.blogspot.com/2009/06/c-html-screen-scraping-part-2.html</a>

Think google have a limitation for user , so users have to login to download a file , I want to login to a site like google with http post and after that download a file .

how to login to site like google with http POST ?

login to google with http POST

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想谷歌对用户有一个限制，所以用户必须登录才能下载文件，我想用http post登录到像谷歌这样的网站，然后下载文件。如何使用http POST登录类似google的站点？

问使用http POST登录到google
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问使用http POST登录到googleEN