blocks|key|1898652|text|看看System.Net.WebClient类，它可用于发出请求和处理其响应，以及下载文件：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1898653|http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx|1898654|http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx|1898655|entityMap|0|LINK|mutability|MUTABLE|url|1^0|2|K|0|0|2I|0|0|0|20|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@$9|V|A|W|1|X]]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|J|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|G]]|Q|$5|M|N|O|E|$P|I]]]]

Take a look at the <code>System.Net.WebClient</code> class, it can be used to issue requests and handle their responses, as well as to download files: 

<a href="http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx" rel="noreferrer">http://www.hanselman.com/blog/HTTPPOSTsAndHTTPGETsWithWebClientAndCAndFakingAPostBack.aspx</a>

<a href="http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx</a>

blocks|key|4674565|text|using+System;
using+System.Collections.Generic;
using+System.Linq;
using+System.Text;
using+System.Net;
using+System.IO;

namespace+WebserverInteractionClassLibrary
{
++++public+class+RequestManager
++++{
++++++++public+string+LastResponse+{+protected+set;+get;+}

++++++++CookieContainer+cookies+=+new+CookieContainer();

++++++++internal+string+GetCookieValue(Uri+SiteUri,string+name)
++++++++{
++++++++++++Cookie+cookie+=+cookies.GetCookies(SiteUri)[name];
++++++++++++return+(cookie+==+null)+?+null+:+cookie.Value;
++++++++}

++++++++public+string+GetResponseContent(HttpWebResponse+response)
++++++++{
++++++++++++if+(response+==+null)
++++++++++++{
++++++++++++++++throw+new+ArgumentNullException("response");
++++++++++++}
++++++++++++Stream+dataStream+=+null;
++++++++++++StreamReader+reader+=+null;
++++++++++++string+responseFromServer+=+null;

++++++++++++try
++++++++++++{
++++++++++++++++//+Get+the+stream+containing+content+returned+by+the+server.
++++++++++++++++dataStream+=+response.GetResponseStream();
++++++++++++++++//+Open+the+stream+using+a+StreamReader+for+easy+access.
++++++++++++++++reader+=+new+StreamReader(dataStream);
++++++++++++++++//+Read+the+content.
++++++++++++++++responseFromServer+=+reader.ReadToEnd();
++++++++++++++++//+Cleanup+the+streams+and+the+response.
++++++++++++}
++++++++++++catch+(Exception+ex)
++++++++++++{
++++++++++++++++Console.WriteLine(ex.Message);
++++++++++++}
++++++++++++finally
++++++++++++{++++++++++++++++
++++++++++++++++if+(reader+!=+null)
++++++++++++++++{
++++++++++++++++++++reader.Close();
++++++++++++++++}
++++++++++++++++if+(dataStream+!=+null)
++++++++++++++++{
++++++++++++++++++++dataStream.Close();
++++++++++++++++}
++++++++++++++++response.Close();
++++++++++++}
++++++++++++LastResponse+=+responseFromServer;
++++++++++++return+responseFromServer;
++++++++}

++++++++public+HttpWebResponse+SendPOSTRequest(string+uri,+string+content,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++HttpWebRequest+request+=+GeneratePOSTRequest(uri,+content,+login,+password,+allowAutoRedirect);
++++++++++++return+GetResponse(request);
++++++++}

++++++++public+HttpWebResponse+SendGETRequest(string+uri,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++HttpWebRequest+request+=+GenerateGETRequest(uri,+login,+password,+allowAutoRedirect);
++++++++++++return+GetResponse(request);
++++++++}

++++++++public+HttpWebResponse+SendRequest(string+uri,+string+content,+string+method,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++HttpWebRequest+request+=+GenerateRequest(uri,+content,+method,+login,+password,+allowAutoRedirect);
++++++++++++return+GetResponse(request);
++++++++}

++++++++public+HttpWebRequest+GenerateGETRequest(string+uri,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++return+GenerateRequest(uri,+null,+"GET",+null,+null,+allowAutoRedirect);
++++++++}

++++++++public+HttpWebRequest+GeneratePOSTRequest(string+uri,+string+content,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++return+GenerateRequest(uri,+content,+"POST",+null,+null,+allowAutoRedirect);
++++++++}

++++++++internal+HttpWebRequest+GenerateRequest(string+uri,+string+content,+string+method,+string+login,+string+password,+bool+allowAutoRedirect)
++++++++{
++++++++++++if+(uri+==+null)
++++++++++++{
++++++++++++++++throw+new+ArgumentNullException("uri");
++++++++++++}
++++++++++++//+Create+a+request+using+a+URL+that+can+receive+a+post.+
++++++++++++HttpWebRequest+request+=+(HttpWebRequest)HttpWebRequest.Create(uri);
++++++++++++//+Set+the+Method+property+of+the+request+to+POST.
++++++++++++request.Method+=+method;
++++++++++++//+Set+cookie+container+to+maintain+cookies
++++++++++++request.CookieContainer+=+cookies;
++++++++++++request.AllowAutoRedirect+=+allowAutoRedirect;
++++++++++++//+If+login+is+empty+use+defaul+credentials
++++++++++++if+(string.IsNullOrEmpty(login))
++++++++++++{
++++++++++++++++request.Credentials+=+CredentialCache.DefaultNetworkCredentials;
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++request.Credentials+=+new+NetworkCredential(login,+password);
++++++++++++}
++++++++++++if+(method+==+"POST")
++++++++++++{
++++++++++++++++//+Convert+POST+data+to+a+byte+array.
++++++++++++++++byte[]+byteArray+=+Encoding.UTF8.GetBytes(content);
++++++++++++++++//+Set+the+ContentType+property+of+the+WebRequest.
++++++++++++++++request.ContentType+=+"application/x-www-form-urlencoded";
++++++++++++++++//+Set+the+ContentLength+property+of+the+WebRequest.
++++++++++++++++request.ContentLength+=+byteArray.Length;
++++++++++++++++//+Get+the+request+stream.
++++++++++++++++Stream+dataStream+=+request.GetRequestStream();
++++++++++++++++//+Write+the+data+to+the+request+stream.
++++++++++++++++dataStream.Write(byteArray,+0,+byteArray.Length);
++++++++++++++++//+Close+the+Stream+object.
++++++++++++++++dataStream.Close();
++++++++++++}
++++++++++++return+request;
++++++++}

++++++++internal+HttpWebResponse+GetResponse(HttpWebRequest+request)
++++++++{
++++++++++++if+(request+==+null)
++++++++++++{
++++++++++++++++throw+new+ArgumentNullException("request");
++++++++++++}
++++++++++++HttpWebResponse+response+=+null;
++++++++++++try
++++++++++++{
++++++++++++++++response+=+(HttpWebResponse)request.GetResponse();++++++++++++++++
++++++++++++++++cookies.Add(response.Cookies);++++++++++++++++
++++++++++++++++//+Print+the+properties+of+each+cookie.
++++++++++++++++Console.WriteLine("\nCookies:+");
++++++++++++++++foreach+(Cookie+cook+in+cookies.GetCookies(request.RequestUri))
++++++++++++++++{
++++++++++++++++++++Console.WriteLine("Domain:+{0},+String:+{1}",+cook.Domain,+cook.ToString());
++++++++++++++++}
++++++++++++}
++++++++++++catch+(WebException+ex)
++++++++++++{
++++++++++++++++Console.WriteLine("Web+exception+occurred.+Status+code:+{0}",+ex.Status);
++++++++++++}
++++++++++++catch+(Exception+ex)
++++++++++++{
++++++++++++++++Console.WriteLine(ex.Message);
++++++++++++}
++++++++++++return+response;
++++++++}

++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4674566|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>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;

namespace WebserverInteractionClassLibrary
{
 public class RequestManager
 {
 public string LastResponse { protected set; get; }

 CookieContainer cookies = new CookieContainer();

 internal string GetCookieValue(Uri SiteUri,string name)
 {
 Cookie cookie = cookies.GetCookies(SiteUri)[name];
 return (cookie == null) ? null : cookie.Value;
 }

 public string GetResponseContent(HttpWebResponse response)
 {
 if (response == null)
 {
 throw new ArgumentNullException("response");
 }
 Stream dataStream = null;
 StreamReader reader = null;
 string responseFromServer = null;

 try
 {
 // Get the stream containing content returned by the server.
 dataStream = response.GetResponseStream();
 // Open the stream using a StreamReader for easy access.
 reader = new StreamReader(dataStream);
 // Read the content.
 responseFromServer = reader.ReadToEnd();
 // Cleanup the streams and the response.
 }
 catch (Exception ex)
 {
 Console.WriteLine(ex.Message);
 }
 finally
 { 
 if (reader != null)
 {
 reader.Close();
 }
 if (dataStream != null)
 {
 dataStream.Close();
 }
 response.Close();
 }
 LastResponse = responseFromServer;
 return responseFromServer;
 }

 public HttpWebResponse SendPOSTRequest(string uri, string content, string login, string password, bool allowAutoRedirect)
 {
 HttpWebRequest request = GeneratePOSTRequest(uri, content, login, password, allowAutoRedirect);
 return GetResponse(request);
 }

 public HttpWebResponse SendGETRequest(string uri, string login, string password, bool allowAutoRedirect)
 {
 HttpWebRequest request = GenerateGETRequest(uri, login, password, allowAutoRedirect);
 return GetResponse(request);
 }

 public HttpWebResponse SendRequest(string uri, string content, string method, string login, string password, bool allowAutoRedirect)
 {
 HttpWebRequest request = GenerateRequest(uri, content, method, login, password, allowAutoRedirect);
 return GetResponse(request);
 }

 public HttpWebRequest GenerateGETRequest(string uri, string login, string password, bool allowAutoRedirect)
 {
 return GenerateRequest(uri, null, "GET", null, null, allowAutoRedirect);
 }

 public HttpWebRequest GeneratePOSTRequest(string uri, string content, string login, string password, bool allowAutoRedirect)
 {
 return GenerateRequest(uri, content, "POST", null, null, allowAutoRedirect);
 }

 internal HttpWebRequest GenerateRequest(string uri, string content, string method, string login, string password, bool allowAutoRedirect)
 {
 if (uri == null)
 {
 throw new ArgumentNullException("uri");
 }
 // Create a request using a URL that can receive a post. 
 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);
 // Set the Method property of the request to POST.
 request.Method = method;
 // Set cookie container to maintain cookies
 request.CookieContainer = cookies;
 request.AllowAutoRedirect = allowAutoRedirect;
 // If login is empty use defaul credentials
 if (string.IsNullOrEmpty(login))
 {
 request.Credentials = CredentialCache.DefaultNetworkCredentials;
 }
 else
 {
 request.Credentials = new NetworkCredential(login, password);
 }
 if (method == "POST")
 {
 // Convert POST data to a byte array.
 byte[] byteArray = Encoding.UTF8.GetBytes(content);
 // Set the ContentType property of the WebRequest.
 request.ContentType = "application/x-www-form-urlencoded";
 // Set the ContentLength property of the WebRequest.
 request.ContentLength = byteArray.Length;
 // Get the request stream.
 Stream dataStream = request.GetRequestStream();
 // Write the data to the request stream.
 dataStream.Write(byteArray, 0, byteArray.Length);
 // Close the Stream object.
 dataStream.Close();
 }
 return request;
 }

 internal HttpWebResponse GetResponse(HttpWebRequest request)
 {
 if (request == null)
 {
 throw new ArgumentNullException("request");
 }
 HttpWebResponse response = null;
 try
 {
 response = (HttpWebResponse)request.GetResponse(); 
 cookies.Add(response.Cookies); 
 // Print the properties of each cookie.
 Console.WriteLine("\nCookies: ");
 foreach (Cookie cook in cookies.GetCookies(request.RequestUri))
 {
 Console.WriteLine("Domain: {0}, String: {1}", cook.Domain, cook.ToString());
 }
 }
 catch (WebException ex)
 {
 Console.WriteLine("Web exception occurred. Status code: {0}", ex.Status);
 }
 catch (Exception ex)
 {
 Console.WriteLine(ex.Message);
 }
 return response;
 }

 }
}
</code></pre>

blocks|key|4674606|text|为此，您可以简单地使用.net中的"HttpWebRequest“和"HttpWebResponse”类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4674607|下面是我写的一个示例控制台应用程序，用来演示这是多么简单。|4674608|using+System;
using+System.Collections.Generic;
using+System.Text;
using+System.Net;
using+System.IO;

namespace+Test
{
++++class+Program
++++{
++++++++static+void+Main(string[]+args)
++++++++{
++++++++++++string+url+=+"www.somewhere.com";+++++++
++++++++++++string+fileName+=+@"C:\output.file";

++++++++++++HttpWebRequest+request+=+(HttpWebRequest)WebRequest.Create(url);
++++++++++++request.Timeout+=+5000;

++++++++++++try
++++++++++++{
++++++++++++++++using+(WebResponse+response+=+(HttpWebResponse)request.GetResponse())
++++++++++++++++{
++++++++++++++++++++using+(FileStream+stream+=+new+FileStream(fileName,+FileMode.Create,+FileAccess.Write))
++++++++++++++++++++{
++++++++++++++++++++++++byte[]+bytes+=+ReadFully(response.GetResponseStream());

++++++++++++++++++++++++stream.Write(bytes,+0,+bytes.Length);
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++++++catch+(WebException)
++++++++++++{
++++++++++++++++Console.WriteLine("Error+Occured");
++++++++++++}
++++++++}

++++++++public+static+byte[]+ReadFully(Stream+input)
++++++++{
++++++++++++byte[]+buffer+=+new+byte[16+*+1024];
++++++++++++using+(MemoryStream+ms+=+new+MemoryStream())
++++++++++++{
++++++++++++++++int+read;
++++++++++++++++while+((read+=+input.Read(buffer,+0,+buffer.Length))+>+0)
++++++++++++++++{
++++++++++++++++++++ms.Write(buffer,+0,+read);
++++++++++++++++}
++++++++++++++++return+ms.ToArray();
++++++++++++}
++++++++}
++++}
}|code-block|syntax|javascript|4674609|享受吧！|4674610|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For this you can simply use the "HttpWebRequest" and "HttpWebResponse" classes in .net.

Below is a sample console app I wrote to demonstrate how easy this is.

<pre><code>using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;

namespace Test
{
 class Program
 {
 static void Main(string[] args)
 {
 string url = "www.somewhere.com"; 
 string fileName = @"C:\output.file";

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
 request.Timeout = 5000;

 try
 {
 using (WebResponse response = (HttpWebResponse)request.GetResponse())
 {
 using (FileStream stream = new FileStream(fileName, FileMode.Create, FileAccess.Write))
 {
 byte[] bytes = ReadFully(response.GetResponseStream());

 stream.Write(bytes, 0, bytes.Length);
 }
 }
 }
 catch (WebException)
 {
 Console.WriteLine("Error Occured");
 }
 }

 public static byte[] ReadFully(Stream input)
 {
 byte[] buffer = new byte[16 * 1024];
 using (MemoryStream ms = new MemoryStream())
 {
 int read;
 while ((read = input.Read(buffer, 0, buffer.Length)) &gt; 0)
 {
 ms.Write(buffer, 0, read);
 }
 return ms.ToArray();
 }
 }
 }
}
</code></pre>

Enjoy!

blocks|key|1151550|text|HttpWebRequest+request+=(HttpWebRequest)WebRequest.Create("some+url");
request.Method+=+"POST";
request.ContentType+=+"application/x-www-form-urlencoded";
request.UserAgent+=+"Mozilla/5.0+(compatible;+MSIE+9.0;+Windows+NT+7.1;+Trident/5.0)";
request.Accept+=+"/";
request.UseDefaultCredentials+=+true;
request.Proxy.Credentials+=+System.Net.CredentialCache.DefaultCredentials;
doc.Save(request.GetRequestStream());
HttpWebResponse+resp+=+request.GetResponse()+as+HttpWebResponse;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1151551|希望能有所帮助|unstyled|1151552|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>HttpWebRequest request =(HttpWebRequest)WebRequest.Create("some url");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 7.1; Trident/5.0)";
request.Accept = "/";
request.UseDefaultCredentials = true;
request.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
doc.Save(request.GetRequestStream());
HttpWebResponse resp = request.GetResponse() as HttpWebResponse;
</code></pre>

Hope it helps

blocks|key|1149028|text|在使用System.Net.WebClient的情况下，我建议你去看看System.Net.Http.HttpClient，它是在NET4.5中引入的，它让你的生活变得更容易。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1149029|此外，微软还建议在本文中使用HttpClient|1149030|http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx|offset|length|1149031|示例如下所示：|1149032|var+client+=+new+HttpClient();
var+content+=+new+MultipartFormDataContent
{
+++++{+new+StringContent("myUserId"),+"userid"},
+++++{+new+StringContent("myFileName"),+"filename"},
+++++{+new+StringContent("myPassword"),+"password"},
+++++{+new+StringContent("myType"),+"type"}
};

var+responseMessage+=+await+client.PostAsync("some+url",+content);++++++++
var+stream+=+await+responseMessage.Content.ReadAsStreamAsync();|code-block|syntax|javascript|1149033|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|20|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|12|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|E]]]]

Insted of using System.Net.WebClient I would recommend to have a look on System.Net.Http.HttpClient which was introduced with net 4.5 and makes your life much easier.

Also microsoft recommends to use the HttpClient on this article

<a href="http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.net.webclient(VS.90).aspx</a>

An example could look like this:

<pre><code>var client = new HttpClient();
var content = new MultipartFormDataContent
{
 { new StringContent("myUserId"), "userid"},
 { new StringContent("myFileName"), "filename"},
 { new StringContent("myPassword"), "password"},
 { new StringContent("myType"), "type"}
};

var responseMessage = await client.PostAsync("some url", content); 
var stream = await responseMessage.Content.ReadAsStreamAsync();
</code></pre>

I need to post data to a URL (https://somesite.com) to download file in responseStrem based on the parameters I posted.
How can I do that using a C# console application?

Parameters:
filename,
userid,
password,
type

Create HTTP post request and receive response using C# console application

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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根据我发布的参数，我需要将数据发布到一个网址()，以便在responseStrem中下载文件。如何使用C#控制台应用程序执行此操作？参数: filename，userid，password，type

问使用C#控制台应用程序创建HTTP post请求并接收响应
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