c＃multipart / form-data以编程方式提交
所以遇到了一个小问题。 我创建了一个小应用程序来自动化一个网站上的表单提交。 但糟糕的是，他们正在使用multipart / form-data。 没有文件只上传一些文本字段用于提交。
当然这样做就失败了。
string postData1 = "firstfield="+firststring+"secondfield="+secondstring;
所以我的问题是如何将这些表单字段以多部分forms发布？
在php中发布像数组一样：
$postdata = array('firstfield' => $firststring, 'secondfield' => $secondstring);
工作并传递表单但似乎无法使用c＃
有什么建议？
数据提交通过3页（基本screenscrape）登录/ part1 / part2
到目前为止，我可以成功登录并发布part1（使用普通应用程序/ x-www-form-urlencoded表单）
但是当生病时尝试发布多部分表单时，它会失败并将我发回给part1。 所以也许我的代码错了，但这里是：
string password = "password"; string username = "username"; string link = "http://somelink.com/"; string text = "Blah Blah some text here"; string title = "Blah Blah"; string tags1 = title; string summary = "Blah Blah summary"; string tags = tags1.Replace(" ", ","); // Set cookie container CookieContainer cookieJar = new CookieContainer(); string loginData = "username=" + username + "&password=" + password + "&processlogin=1&return=%2Fsubmit.php"; HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://loginlink.com/login.php"); myRequest.Method = "POST"; myRequest.ServicePoint.Expect100Continue = false; myRequest.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4 GTB6 (.NET CLR 3.5.30729)"; myRequest.Timeout = 10000; myRequest.ContentType = "application/x-www-form-urlencoded"; myRequest.ContentLength = loginData.Length; myRequest.CookieContainer = cookieJar; myRequest.KeepAlive = true; myRequest.AllowAutoRedirect = true; //Write post data to stream StreamWriter myWriter = new StreamWriter(myRequest.GetRequestStream()); myWriter.Write(loginData); myWriter.Close(); // Get the response. HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); // Open the stream using a StreamReader for easy access. StreamReader myReader = new StreamReader(myResponse.GetResponseStream()); // Read the content. string output = myReader.ReadToEnd(); // Clean up the streams and the response. myReader.Close(); myResponse.Close(); Match matchkey = Regex.Match(output, "type=\"hidden\" name=\"randkey\" value=\"([^\"]+)\"", RegexOptions.IgnoreCase); string key1 = matchkey.Groups[1].Value; Match matchid = Regex.Match(output, "type=\"hidden\" name=\"id\" value=\"([^\"]+)\"", RegexOptions.IgnoreCase); string id1 = matchid.Groups[1].Value; string postData = "url=" + link + "&phase=1&randkey=" + key1 + "&id=" + id1; HttpWebRequest myRequest2 = (HttpWebRequest)WebRequest.Create("http://submitpage1.com/submit.php"); myRequest2.Method = "POST"; myRequest2.ServicePoint.Expect100Continue = false; myRequest2.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4 GTB6 (.NET CLR 3.5.30729)"; myRequest2.Timeout = 10000; myRequest2.ContentType = "application/x-www-form-urlencoded"; myRequest2.ContentLength = postData.Length; myRequest2.CookieContainer = cookieJar; myRequest2.KeepAlive = true; myRequest2.AllowAutoRedirect = true; //Write post data to stream StreamWriter myWriter2 = new StreamWriter(myRequest2.GetRequestStream()); myWriter2.Write(postData); myWriter2.Close(); // Get the response. HttpWebResponse myResponse2 = (HttpWebResponse)myRequest2.GetResponse(); // Open the stream using a StreamReader for easy access. StreamReader myReader2 = new StreamReader(myResponse2.GetResponseStream()); // Read the content. string output1 = myReader2.ReadToEnd(); // Clean up the streams and the response. myReader2.Close(); myResponse2.Close(); Match matchkey1 = Regex.Match(output1, "type=\"hidden\" name=\"randkey\" value=\"([^\"]+)\"", RegexOptions.IgnoreCase); string key2 = matchkey1.Groups[1].Value; Match matchid1 = Regex.Match(output1, "type=\"hidden\" name=\"randkey\" value=\"([^\"]+)\"", RegexOptions.IgnoreCase); string id2 = matchid1.Groups[1].Value; string boundary = "-----------------------------1721856231228"; // Build up the post StringBuilder sb = new StringBuilder(); sb.Append("\r\n" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"title\"" + "\r\n"); sb.Append("\r\n"); sb.Append(title); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"tags\"" + "\r\n"); sb.Append("\r\n"); sb.Append(tags); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"bodytext\"" + "\r\n"); sb.Append("\r\n"); sb.Append(text); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"summarycheckbox\"" + "\r\n"); sb.Append("\r\n"); sb.Append("on"); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"summarytext\"" + "\r\n"); sb.Append("\r\n"); sb.Append(summary); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"remLen\"" + "\r\n"); sb.Append("\r\n"); sb.Append("125"); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"category\"" + "\r\n"); sb.Append("\r\n"); sb.Append("1"); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"trackback\"" + "\r\n"); sb.Append("\r\n"); sb.Append(""); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"url\"" + "\r\n"); sb.Append("\r\n"); sb.Append(link); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"phase\"" + "\r\n"); sb.Append("\r\n"); sb.Append("2"); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"randkey\"" + "\r\n"); sb.Append("\r\n"); sb.Append(key2); sb.Append("\r\n--" + boundary + "\r\n"); sb.Append("Content-Disposition: form-data; name=\"id\"" + "\r\n"); sb.Append("\r\n"); sb.Append(id2); sb.Append("\r\n--" + boundary + "--" + "\r\n"); string postData1 = sb.ToString(); HttpWebRequest myRequest3 = (HttpWebRequest)WebRequest.Create("http://submitpage2.com/submit.php"); myRequest3.Method = "POST"; myRequest3.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4 GTB6 (.NET CLR 3.5.30729)"; myRequest3.Timeout = 10000; myRequest3.ServicePoint.Expect100Continue = false; myRequest3.Referer = "http://bookmarkindo.com/submit.php"; myRequest3.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; myRequest3.ContentType = "multipart/form-data; boundary=" + boundary; myRequest3.ContentLength = postData1.Length; myRequest3.CookieContainer = cookieJar; myRequest3.KeepAlive = true; myRequest3.AllowAutoRedirect = true; //Write out postdata StreamWriter myWriter3 = new StreamWriter(myRequest3.GetRequestStream()); myWriter3.Write(postData1); myWriter3.Close(); // Get the response. HttpWebResponse myResponse3 = (HttpWebResponse)myRequest3.GetResponse(); // Open the stream using a StreamReader for easy access. StreamReader myReader3 = new StreamReader(myResponse3.GetResponseStream()); // Read the content. string output2 = myReader3.ReadToEnd(); // Clean up the streams and the response. myReader3.Close(); myResponse3.Close();
欢迎所有建议
posts multi multipart / form-data类型具有不同的结构，因为它们用于传输数据而不仅仅是纯文本。
这是格式：
--[random number, a GUID is good here] Content-Disposition: form-data; name="[name of variable]" [actual value] --[random number, a GUID is good here]--
使用HTTPWebRequest，您可以创建具有该格式的请求。 这是一个示例：
string boundary = Guid.NewGuid().ToString(); string header = string.Format("--{0}", boundary); string footer = string.Format("--{0}--", boundary); StringBuilder contents = new StringBuilder(); contents.AppendLine(header); contents.AppendLine(header); contents.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0}\"", "username")); contents.AppendLine(); contents.AppendLine("your_username"); contents.AppendLine(header); contents.AppendLine(String.Format("Content-Disposition: form-data; name=\"{0}\"", "password")); contents.AppendLine(); contents.AppendLine("your_password"); contents.AppendLine(footer);
这是一篇关于C＃中多部分表单post的文章，内容更详细。 此代码最终合并到RestSharp中 ，这是一个可用于生成请求的出色库。
这里概述了multipart/form-data请求的格式： http ： //www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2 。