blocks|key|2077940|text|您使用的是哪种身份验证？如果是表单身份验证，那么最多只能找到.ASPXAUTH+cookie并在WebClient请求中传递它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2077941|在最坏的情况下，它不会工作。|2077942|entityMap^0|1C|9|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

What kind of authentication are you using? If it's Forms authentication, then at best, you'll have to find the .ASPXAUTH cookie and pass it in the <code>WebClient</code> request.

At worst, it won't work.

blocks|key|1903904|text|您需要为WebClient对象提供凭据。就像这样..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1903905|+WebClient+client+=+new+WebClient();
+client.Credentials+=+new+NetworkCredential("username",+"password");|code-block|syntax|javascript|1903906|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|$]]

You need to give the WebClient object the credentials. Something like this...

<pre><code> WebClient client = new WebClient();
 client.Credentials = new NetworkCredential("username", "password");
</code></pre>

blocks|key|601129|text|Public+Function+getWeb(ByRef+sURL+As+String)+As+String
++++Dim+myWebClient+As+New+System.Net.WebClient()

++++Try
++++++++Dim+myCredentialCache+As+New+System.Net.CredentialCache()
++++++++Dim+myURI+As+New+Uri(sURL)
++++++++myCredentialCache.Add(myURI,+"ntlm",+System.Net.CredentialCache.DefaultNetworkCredentials)
++++++++myWebClient.Encoding+=+System.Text.Encoding.UTF8
++++++++myWebClient.Credentials+=+myCredentialCache
++++++++Return+myWebClient.DownloadString(myURI)
++++Catch+ex+As+Exception
++++++++Return+"Exception+"+&+ex.ToString()
++++End+Try
End+Function|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|601130|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Public Function getWeb(ByRef sURL As String) As String
 Dim myWebClient As New System.Net.WebClient()

 Try
 Dim myCredentialCache As New System.Net.CredentialCache()
 Dim myURI As New Uri(sURL)
 myCredentialCache.Add(myURI, "ntlm", System.Net.CredentialCache.DefaultNetworkCredentials)
 myWebClient.Encoding = System.Text.Encoding.UTF8
 myWebClient.Credentials = myCredentialCache
 Return myWebClient.DownloadString(myURI)
 Catch ex As Exception
 Return "Exception " &amp; ex.ToString()
 End Try
End Function
</code></pre>

blocks|key|1903928|text|这帮助我调用了使用cookie身份验证的API。我在header中通过了授权，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1903929|request.Headers.Set("Authorization",+Utility.Helper.ReadCookie("AuthCookie"));|code-block|syntax|javascript|1903930|完整代码：|1903931|//+utility+method+to+read+the+cookie+value:
++++++++public+static+string+ReadCookie(string+cookieName)
++++++++{
++++++++++++var+cookies+=+HttpContext.Current.Request.Cookies;
++++++++++++var+cookie+=+cookies.Get(cookieName);
++++++++++++if+(cookie+!=+null)
++++++++++++++++return+cookie.Value;
++++++++++++return+null;
++++++++}

//+using+statements+where+you+are+creating+your+webclient
using+System.Web.Script.Serialization;
using+System.Net;
using+System.IO;

//+WebClient:

var+requestUrl+=+"<API_url>";
var+postRequest+=+new+ClassRoom+{+name+=+"kushal+seth"+};

using+(var+webClient+=+new+WebClient())+{
++++++JavaScriptSerializer+serializer+=+new+JavaScriptSerializer();
++++++byte[]+requestData+=+Encoding.ASCII.GetBytes(serializer.Serialize(postRequest));
++++++HttpWebRequest+request+=+WebRequest.Create(requestUrl)+as+HttpWebRequest;
++++++request.Method+=+"POST";
++++++request.ContentType+=+"application/json";++++++++++++++++++++++++
++++++request.ContentLength+=+requestData.Length;
++++++request.ContentType+=+"application/json";
++++++request.Expect+=+"application/json";
++++++request.Headers.Set("Authorization",+Utility.Helper.ReadCookie("AuthCookie"));
++++++request.GetRequestStream().Write(requestData,+0,+requestData.Length);

++++++using+(var+response+=+(HttpWebResponse)request.GetResponse())+{
+++++++++var+reader+=+new+StreamReader(response.GetResponseStream());
+++++++++var+objText+=+reader.ReadToEnd();+//+objText+will+have+the+value
++++++}
}|1903932|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This helped me to call API that was using cookie authentication. I have passed authorization in header like this:
<pre><code>request.Headers.Set(&quot;Authorization&quot;, Utility.Helper.ReadCookie(&quot;AuthCookie&quot;));

</code></pre>
complete code:
<pre><code>// utility method to read the cookie value:
 public static string ReadCookie(string cookieName)
 {
 var cookies = HttpContext.Current.Request.Cookies;
 var cookie = cookies.Get(cookieName);
 if (cookie != null)
 return cookie.Value;
 return null;
 }

// using statements where you are creating your webclient
using System.Web.Script.Serialization;
using System.Net;
using System.IO;

// WebClient:

var requestUrl = &quot;&lt;API_url&gt;&quot;;
var postRequest = new ClassRoom { name = &quot;kushal seth&quot; };

using (var webClient = new WebClient()) {
 JavaScriptSerializer serializer = new JavaScriptSerializer();
 byte[] requestData = Encoding.ASCII.GetBytes(serializer.Serialize(postRequest));
 HttpWebRequest request = WebRequest.Create(requestUrl) as HttpWebRequest;
 request.Method = &quot;POST&quot;;
 request.ContentType = &quot;application/json&quot;; 
 request.ContentLength = requestData.Length;
 request.ContentType = &quot;application/json&quot;;
 request.Expect = &quot;application/json&quot;;
 request.Headers.Set(&quot;Authorization&quot;, Utility.Helper.ReadCookie(&quot;AuthCookie&quot;));
 request.GetRequestStream().Write(requestData, 0, requestData.Length);

 using (var response = (HttpWebResponse)request.GetResponse()) {
 var reader = new StreamReader(response.GetResponseStream());
 var objText = reader.ReadToEnd(); // objText will have the value
 }
}


</code></pre>

I am making a call to a page on my site using webclient. I'm trying to get the result of the webpage put into a pdf so I am trying to get a string representation of the rendered page. The problem is that the request is not authenticated so all I get is a login screen. I have sent the UseDefaultCredentials property to true but I still get the same result. Below is a portion of my code:

<pre><code> WebClient webClient = new WebClient();
 webClient.Encoding = Encoding.UTF8;

 webClient.UseDefaultCredentials = true;
 return Encoding.UTF8.GetString(webClient.UploadValues(link, "POST",form));
</code></pre>

How do I authenticate a WebClient request?

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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我正在使用webclient调用我网站上的一个页面。我试着把网页的结果放到pdf中，所以我试着得到渲染页面的字符串表示。问题是请求没有经过身份验证，所以我得到的只是一个登录屏幕。我已经将UseDefaultCredentials属性发送给true，但仍然得到相同的结果。下面是我的代码的一部分： WebClient webClient = new WebClient(); webClient.Enc

问如何验证WebClient请求？
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