blocks|key|538609|text|试着这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|538610|HttpWebRequest+request+=+(HttpWebRequest)WebRequest.Create("http://www.contoso.com/default.html");
request.CookieContainer+=+new+CookieContainer();
request.CookieContainer.Add(new+Cookie("ConstoCookie",+"Chocolate+Flavour"));|code-block|syntax|javascript|538611|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try with something like this:

<pre><code>HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.contoso.com/default.html");
request.CookieContainer = new CookieContainer();
request.CookieContainer.Add(new Cookie("ConstoCookie", "Chocolate Flavour"));
</code></pre>

blocks|key|538665|text|根据您的注释，您可以考虑编写一个extension+method|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|538666|public+static+bool+TryAddCookie(this+WebRequest+webRequest,+Cookie+cookie)
{
++++HttpWebRequest+httpRequest+=+webRequest+as+HttpWebRequest;
++++if+(httpRequest+==+null)
++++{
++++++++return+false;
++++}

++++if+(httpRequest.CookieContainer+==+null)
++++{
++++++++httpRequest.CookieContainer+=+new+CookieContainer();
++++}

++++httpRequest.CookieContainer.Add(cookie);
++++return+true;
}|code-block|syntax|javascript|538667|然后你就可以像这样编写代码：|538668|WebRequest+webRequest+=+WebRequest.Create(+uri+);
webRequest.TryAddCookie(new+Cookie("someName","someValue"));|538669|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/bb383977.aspx^0|G|G|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Based on your comments, you might consider writing an <a href="http://msdn.microsoft.com/en-us/library/bb383977.aspx" rel="noreferrer">extension method</a>:

<pre><code>public static bool TryAddCookie(this WebRequest webRequest, Cookie cookie)
{
 HttpWebRequest httpRequest = webRequest as HttpWebRequest;
 if (httpRequest == null)
 {
 return false;
 }

 if (httpRequest.CookieContainer == null)
 {
 httpRequest.CookieContainer = new CookieContainer();
 }

 httpRequest.CookieContainer.Add(cookie);
 return true;
}
</code></pre>

Then you can have code like:

<pre><code>WebRequest webRequest = WebRequest.Create( uri );
webRequest.TryAddCookie(new Cookie("someName","someValue"));
</code></pre>

blocks|key|538711|text|WebRequest是一个没有CookieContainer属性的抽象类。此外，您不能使用Headers集合(未实现异常)，因此任何尝试，如webRequest.Headers.Add("Cookie"，"...")都会失败。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|538712|很抱歉，您没有机会在WebRequest中使用cookies。|538713|坚持使用HttpWebRequest，并使用其Headers集合添加/编辑任意数量的cookies！|538714|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

WebRequest is an abstract class that does not have a CookieContainer property. In addition you can't use the Headers collection (not implemented exception) so any attempt like webRequest.Headers.Add("Cookie", "...") will fail.

Sorry, but you have no chance to use cookies with WebRequest.

Stick on HttpWebRequest and add/edit as many cookies you like using its Headers collection!

blocks|key|321878|text|dlev的答案最终是有效的，但我在实现解决方案时遇到了问题(“参数'{0}‘不能是空字符串。”)，所以我决定编写完整的代码，以防其他人遇到类似的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|321879|我的目标是获得字符串形式的html，但我需要将cookie添加到web请求中。这是使用cookie下载字符串的函数：|321880|public+static+string+DownloadString(string+url,+Encoding+encoding,+IDictionary<string,+string>+cookieNameValues)
{
++++using+(var+webClient+=+new+WebClient())
++++{
++++++++var+uri+=+new+Uri(url);
++++++++var+webRequest+=+WebRequest.Create(uri);
++++++++foreach(var+nameValue+in+cookieNameValues)
++++++++{
++++++++++++webRequest.TryAddCookie(new+Cookie(nameValue.Key,+nameValue.Value,+"/",+uri.Host));
++++++++}++++++++++++++++
++++++++var+response+=+webRequest.GetResponse();
++++++++var+receiveStream+=+response.GetResponseStream();
++++++++var+readStream+=+new+StreamReader(receiveStream,+encoding);
++++++++var+htmlCode+=+readStream.ReadToEnd();++++++++++++++++
++++++++return+htmlCode;
++++}
}+++|code-block|syntax|javascript|321881|我们使用的是dlev答案中的代码：|321882|public+static+bool+TryAddCookie(this+WebRequest+webRequest,+Cookie+cookie)
{
++++HttpWebRequest+httpRequest+=+webRequest+as+HttpWebRequest;
++++if+(httpRequest+==+null)
++++{
++++++++return+false;
++++}

++++if+(httpRequest.CookieContainer+==+null)
++++{
++++++++httpRequest.CookieContainer+=+new+CookieContainer();
++++}

++++httpRequest.CookieContainer.Add(cookie);
++++return+true;
}|321883|下面是完整代码的使用方法：|321884|var+cookieNameValues+=+new+Dictionary<string,+string>();
cookieNameValues.Add("varName",+"varValue");
var+htmlResult+=+DownloadString(url,+Encoding.UTF8,+cookieNameValues);|321885|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

dlev's answer ended up working, but I had problems implementing the solution ("The parameter '{0}' cannot be an empty string."), so I decided to write the full code in case anybody else has similar problems.

My goal was to get the html as a string, but I needed to add the cookies to the web request. This is the function that downloads the string using the cookies:

<pre><code>public static string DownloadString(string url, Encoding encoding, IDictionary&lt;string, string&gt; cookieNameValues)
{
 using (var webClient = new WebClient())
 {
 var uri = new Uri(url);
 var webRequest = WebRequest.Create(uri);
 foreach(var nameValue in cookieNameValues)
 {
 webRequest.TryAddCookie(new Cookie(nameValue.Key, nameValue.Value, "/", uri.Host));
 } 
 var response = webRequest.GetResponse();
 var receiveStream = response.GetResponseStream();
 var readStream = new StreamReader(receiveStream, encoding);
 var htmlCode = readStream.ReadToEnd(); 
 return htmlCode;
 }
} 
</code></pre>

We are using the code from dlev's answer: 

<pre><code>public static bool TryAddCookie(this WebRequest webRequest, Cookie cookie)
{
 HttpWebRequest httpRequest = webRequest as HttpWebRequest;
 if (httpRequest == null)
 {
 return false;
 }

 if (httpRequest.CookieContainer == null)
 {
 httpRequest.CookieContainer = new CookieContainer();
 }

 httpRequest.CookieContainer.Add(cookie);
 return true;
}
</code></pre>

This is how you use the full code:

<pre><code>var cookieNameValues = new Dictionary&lt;string, string&gt;();
cookieNameValues.Add("varName", "varValue");
var htmlResult = DownloadString(url, Encoding.UTF8, cookieNameValues);
</code></pre>

I am trying to unit test some code, and I need to to replace this:

<pre><code> HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create( uri );
 httpWebRequest.CookieContainer = new CookieContainer();
</code></pre>

with

<pre><code> WebRequest webRequest = WebRequest.Create( uri );
 webRequest.CookieContainer = new CookieContainer(); 
</code></pre>

Basically, how do I get cookies into the request without using a HttpWebRequest?

How to add cookies to WebRequest?

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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我正在尝试对一些代码进行单元测试，我需要替换以下代码：  HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create( uri );  httpWebRequest.CookieContainer = new CookieContainer();使...

问如何向WebRequest添加cookies？
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问如何向WebRequest添加cookies？EN