是否可以将数据从C＃应用程序发送到网站/网络服务器？

我希望有人能帮助我一段令我困惑的问题。是否可以将数据从C＃应用程序发送到网站/网络服务器？

是否有可能在打开浏览器时将数据从C＃应用程序发送到网页，例如：如果你有一个在线登录表单，并想从你的C＃应用程序发布一个用户名和密码到该表单。

我看到像打开的浏览器的页面形式和程序发布登录信息到该页面后，页面可以处理的形式马上从而在登录并将其发送到首页。这可能吗？

在此先感谢

保罗

来源

2010-12-17 AdrenalineJunky

为什么这个标记的PHP？ – 2010-12-17 21:38:19

发布到Apache PHP服务器??????? – 2010-12-17 21:44:05

是的，的确，这就是我创建页面的方式，表单将通过PHP – AdrenalineJunky 2010-12-18 14:56:18

肯定。

您可以使用HttpWebRequest与网页或Web服务器（或Web服务）进行通信。这是实际的代码，我用它来从Facebook网址获取数据：

internal static string FbFetch(string url) 
{ 
    var request = (HttpWebRequest)WebRequest.Create(url); 
    request.Method = "GET"; 
    using (var response = (HttpWebResponse)request.GetResponse()) 
    { 
     using (var reader = new StreamReader(response.GetResponseStream())) 
     { 
      var responseText = reader.ReadToEnd(); 
      return responseText; 
     } 
    } 
}

不过，你描述的被称为“HTML屏幕抓取”什么，它可以用于构建应用程序的一个繁琐而脆的方法。单调乏味，因为很难浏览所有的UI糖果，而且很脆弱，因为如果页面设计师改变他的页面，你的屏幕抓取将不再起作用。

祝你好运。

来源

2010-12-17 21:24:43 Cheeso

处理，非常简洁。我打算建议使用'WebClient'，但这足够短，确实没有意义。 – 2010-12-17 21:26:18

谢谢，看起来很有用，但我需要打开用户默认的网页浏览器，这是否可行？ – AdrenalineJunky 2010-12-17 21:32:55

另外，这是使用GET，有没有相当的职位？ – AdrenalineJunky 2010-12-17 21:34:04

要回答你关于HTTP帖子（附件）的问题，它更难 - 因为附件。这是我用来将图像发布到FaceBook的实际代码。

/// <summary> 
    /// Create a new HttpWebRequest with the default properties for HTTP POSTS 
    /// </summary> 
    /// <param name="url">The URL to be posted to</param> 
    /// <param name="referer">The refer</param> 
    /// <param name="cookies">CookieContainer that should be used in this request</param> 
    /// <param name="postData">The post data</param> 
    private string CreateHttpWebUploadRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData, FileInfo fileData, string fileContentType) 
    { 
     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); 
     string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x", CultureInfo.InvariantCulture); 

     // set the request variables 
     request.Method = WebRequestMethods.Http.Post; 
     request.ContentType = "multipart/form-data; boundary=" + boundary; 
     request.CookieContainer = cookies; 
     request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4"; 
     request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*"; 
     request.Headers.Add("Accept-Encoding: gzip,deflate"); 
     request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; 
     request.Headers.Add("Accept-Language: en-us"); 
     request.Referer = referer; 
     request.KeepAlive = true; 
     request.AllowAutoRedirect = false; 

     // process through the fields 
     StringBuilder sbHeader = new StringBuilder(); 

     // add form fields, if any 
     if (postData != null) 
     { 
      foreach (string key in postData.AllKeys) 
      { 
       string[] values = postData.GetValues(key); 
       if (values != null) 
       { 
        foreach (string value in values) 
        { 
         if (!string.IsNullOrEmpty(value)) 
          sbHeader.AppendFormat("--{0}\r\n", boundary); 
          sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}\r\n", key, value); 
        } 
       } 
      } 
     } 

     if (fileData != null) 
     { 
      sbHeader.AppendFormat("--{0}\r\n", boundary); 
      sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n", "media", fileData.Name); 
      sbHeader.AppendFormat("Content-Type: {0}\r\n\r\n", fileContentType); 
     } 

     byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString()); 
     byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n"); 
     long contentLength = header.Length + (fileData != null ? fileData.Length : 0) + footer.Length; 

     // set content length 
     request.ContentLength = contentLength; 

     using (Stream requestStream = request.GetRequestStream()) 
     { 
      requestStream.Write(header, 0, header.Length); 

      // write the uploaded file 
      if (fileData != null) 
      { 
       // write the file data, if any 
       byte[] buffer = new Byte[fileData.Length]; 
       var bytesRead = fileData.OpenRead().Read(buffer, 0, (int)(fileData.Length)); 
       requestStream.Write(buffer, 0, bytesRead); 
      } 

      // write footer 
      requestStream.Write(footer, 0, footer.Length); 
      requestStream.Flush(); 
      requestStream.Close(); 

      using (var response = request.GetResponse() as HttpWebResponse) 
      { 
       using (var stIn = new System.IO.StreamReader(response.GetResponseStream())) 
       { 
        return stIn.ReadToEnd(); 
       } 
      } 
     } 
    }

更新并使其完整，这里是不需要的文件附件职位的代码。再次，我使用此代码发布到FaceBook。

/// <summary> 
    /// Create a new HttpWebRequest with the default properties for HTTP POSTS 
    /// </summary> 
    /// <param name="url">The URL to be posted to</param> 
    /// <param name="referer">The refer</param> 
    /// <param name="cookies">CookieContainer that should be used in this request</param> 
    /// <param name="postData">The post data (needs to be formatted in name=value& format</param> 
    private string CreateHttpWebPostRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData) 
    { 
     var sbPostData = new StringBuilder(); 

     if (postData != null) 
     { 
      foreach (string key in postData.AllKeys) 
      { 
       string[] values = postData.GetValues(key); 
       if (values != null) 
       { 
        foreach (string value in values) 
        { 
         if (!string.IsNullOrEmpty(value)) 
          sbPostData.Append(string.Format("{0}={1}&", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(value))); 
        } 
       } 
      } 
     } 

     var parameterString = Encoding.UTF8.GetBytes(sbPostData.ToString()); 
     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); 
     request.Method = WebRequestMethods.Http.Post; 
     request.CookieContainer = cookies; 
     request.ContentLength = parameterString.Length; 
     request.ContentType = "application/x-www-form-urlencoded"; 
     request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4"; 
     request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*"; 
     request.Headers.Add("Accept-Encoding: gzip,deflate"); 
     request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; 
     request.Headers.Add("Accept-Language: en-us"); 
     request.Referer = referer; 
     request.KeepAlive = true; 
     request.AllowAutoRedirect = false; 

     using (Stream requestStream = request.GetRequestStream()) 
     { 
      requestStream.Write(parameterString, 0, parameterString.Length); 
      requestStream.Close(); 

      using (var response = request.GetResponse() as HttpWebResponse) 
      { 
       using (var stIn = new System.IO.StreamReader(response.GetResponseStream())) 
       { 
        return stIn.ReadToEnd(); 
       } 
      } 
     } 
    }

来源

2010-12-17 21:43:22

嘿，这不是那种类似于C＃facebooksdk http：//facebooksdk.codeplex中的代码的东西。com – 2010-12-19 04:14:53

谢谢杰森，我试过的代码，但似乎无法使其工作在https登录，是否有任何区别发布到https而不是http？或者，问题可能是Cookie没有正确创建，或者它没有正确重定向，某些事情绝对不是奇怪的工作/行为。有任何想法吗？ – AdrenalineJunky 2010-12-19 20:03:32

@Shekhar_Pro - 不，我创建了这个专门与Facebook Graph API进行通信。不使用facebooksdk。我确实从http://skysanders.net/subtext/archive/2010/04/12/c-file-upload-with-form-fields-cookies-and-headers.aspx得到了帮助，但 – 2010-12-20 01:49:17

您可以直接在C＃中自动执行webbrowser control。与HttpWebRequest不同，这将与任何网站一起使用。

但如果你有更多的钱比时，可考虑使用商业component。

来源

2010-12-19 22:00:25

是否可以将数据从C＃应用程序发送到网站/网络服务器？

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