Develop Reference

Uploading a file with C# on input type file

I'm trying to figure out how to upload a file using C# on a
<input type="file" />
I've been testing my code out with this sample upload form http://cgi-lib.berkeley.edu/ex/fup.html.
Here's my code which I took from this answer: https://stackoverflow.com/a/2996904/2245648.
static void Main(string[] args)
{
NameValueCollection nvc = new NameValueCollection();
nvc.Add("tbxEmail", "test");
nvc.Add("btn-submit-photo", "Upload");
HttpUploadFile(#"http://jobview.monster.ca/Apply/Apply.aspx?JobID=133227319",
#"C:\test\test.jpg", "file", "image/jpeg", nvc);
Console.ReadLine();
}
public static void HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc)
{
Console.WriteLine(string.Format("Uploading {0} to {1}", file, url));
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
wr.ContentType = "multipart/form-data; bsundary=" + boundary;
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream rs = wr.GetRequestStream();
string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
foreach (string key in nvc.Keys)
{
rs.Write(boundarybytes, 0, boundarybytes.Length);
string formitem = string.Format(formdataTemplate, key, nvc[key]);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
rs.Write(formitembytes, 0, formitembytes.Length);
}
rs.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
string header = string.Format(headerTemplate, paramName, file, contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
rs.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
rs.Write(trailer, 0, trailer.Length);
rs.Close();
WebResponse wresp = null;
try
{
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
Console.WriteLine(string.Format("File uploaded, server response is: {0}", reader2.ReadToEnd()));
}
catch (Exception ex)
{
Console.WriteLine("Error uploading file", ex);
if (wresp != null)
{
wresp.Close();
wresp = null;
}
}
finally
{
wr = null;
}
}
I don't know what to put in nvc.Add(), I thought it would be the name of the element? How would this work if I were uploading a file to cgi-lib.berkeley.edu? I look at my result and I get the same exact page again. I was assuming I would get the confirmation page display my file contents.
EDIT:
Does WebClient supports multipart/form-data?

Reading a DOCX file from stream

I wrote the following code for posting two file (an XML and a DOCX file) into a webservice:
public void postMultipleFiles(string url, string[] files)
{
string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
httpWebRequest.Method = "POST";
httpWebRequest.KeepAlive = true;
httpWebRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream memStream = new System.IO.MemoryStream();
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}";
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";
memStream.Write(boundarybytes, 0, boundarybytes.Length);
for (int i = 0; i < files.Length; i++)
{
string header = string.Format(headerTemplate, "file" + i, files[i]);
//string header = string.Format(headerTemplate, "uplTheFile", files[i]);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
memStream.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(files[i], FileMode.Open,
FileAccess.Read);
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
memStream.Write(boundarybytes, 0, boundarybytes.Length);
fileStream.Close();
}
/*AJ*/
httpWebRequest.ContentLength = memStream.Length;
Stream requestStream = httpWebRequest.GetRequestStream();
memStream.Position = 0;
byte[] tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
try
{
WebResponse webResponse = httpWebRequest.GetResponse();
Stream stream = webResponse.GetResponseStream();
StreamReader reader = new StreamReader(stream);
response.InnerHtml = reader.ReadToEnd();
}
catch (Exception ex)
{
response.InnerHtml = ex.Message;
}
httpWebRequest = null;
}
At the webservice I retrieve the same as following:
public string MultiFilePost()
{
string xmls = "";
string txt = "";
XmlDocument xmldoc = new XmlDocument();
if (HttpContext.Current.Request.InputStream != null)
{
StreamReader stream = new StreamReader(HttpContext.Current.Request.InputStream);
/*First File*/
Stream xmlStream = System.Web.HttpContext.Current.Request.Files[0].InputStream;
StreamReader rd = new StreamReader(xmlStream);
xmls = rd.ReadToEnd();
/*Second File*/
Stream txtStream = System.Web.HttpContext.Current.Request.Files[1].InputStream;
rd = new StreamReader(txtStream);
txt = rd.ReadToEnd();
}
return xmls;
}
And thus I get the input streams to string. I can convert the string "xmls" into an XmlDocument object, but in the string txt I receive some sort of string and I need a way to handle it as XmlDocument handles XML files.
Thanks in advance.

Use the XmlDocument.Load Method (Stream):
// First file
var xmlStream = System.Web.HttpContext.Current.Request.Files[0].InputStream;
var xmlDocument = new XmlDocument();
xmlDocument.Load(xmlStream);
// The same code for the second file processing.
// Second file
var wordDocStream = System.Web.HttpContext.Current.Request.Files[1].InputStream;
var wordXmlDocument = new XmlDocument();
wordXmlDocument.Load(wordDocStream);
Update
To work with Word documents:
OpenXML
ClosedXML

Receiving an out of memory exception with memorystream

I'm attempting to write an application that will work with the open source media management platform, Kaltura. Kaltura has provided some C# client libraries that talk to their web API and I have been able to talk to the server and upload videos successfully. The problem I am having is that once files reach a certain size, I receive an out of memory exception and the program crashes. I would like to attempt to fix this issue and submit the improved code back to the open source project, but being new to C#, I'm not exactly where to start. Is there a better way than memorystream to do what they're doing?
Thanks in advance.
//Problematic code
private void PostMultiPartWithFiles(HttpWebRequest request, KalturaParams kparams, KalturaFiles kfiles)
{
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
request.ContentType = "multipart/form-data; boundary=" + boundary;
// use a memory stream because we don't know the content length of the request when we have multiple files
MemoryStream memStream = new MemoryStream();
byte[] buffer;
int bytesRead = 0;
StringBuilder sb = new StringBuilder();
sb.Append("--" + boundary + "\r\n");
foreach (KeyValuePair<string, string> param in kparams)
{
sb.Append("Content-Disposition: form-data; name=\"" + param.Key + "\"" + "\r\n");
sb.Append("\r\n");
sb.Append(param.Value);
sb.Append("\r\n--" + boundary + "\r\n");
}
buffer = Encoding.UTF8.GetBytes(sb.ToString());
memStream.Write(buffer, 0, buffer.Length);
foreach (KeyValuePair<string, FileStream> file in kfiles)
{
sb = new StringBuilder();
FileStream fileStream = file.Value;
sb.Append("Content-Disposition: form-data; name=\"" + file.Key + "\"; filename=\"" + Path.GetFileName(fileStream.Name) + "\"" + "\r\n");
sb.Append("Content-Type: application/octet-stream" + "\r\n");
sb.Append("\r\n");
// write the current string builder content
buffer = Encoding.UTF8.GetBytes(sb.ToString());
memStream.Write(buffer, 0, buffer.Length);
// write the file content
buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];
bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
memStream.Write(buffer, 0, bytesRead);
buffer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
memStream.Write(buffer, 0, buffer.Length);
}
request.ContentLength = memStream.Length;
Stream requestStream = request.GetRequestStream();
// write the memorty stream to the request stream
memStream.Seek(0, SeekOrigin.Begin);
buffer = new Byte[checked((uint)Math.Min(4096, (int)memStream.Length))];
bytesRead = 0;
while ((bytesRead = memStream.Read(buffer, 0, buffer.Length)) != 0)
requestStream.Write(buffer, 0, bytesRead);
requestStream.Close();
memStream.Close();
}

Here's a version more or less how I would write it. It only compiles, but I haven't tested it. Note the use of a StreamWriter and the direct use of the request stream...
public class SendStuff
{
private readonly HttpWebRequest _request;
private readonly Dictionary<string, string> _kparams;
private readonly Dictionary<string, FileStream> _kfiles;
readonly string _boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
public SendStuff(
HttpWebRequest request,
Dictionary<string, string> kparams,
Dictionary<string, FileStream> kfiles)
{
_request = request;
_kparams = kparams;
_kfiles = kfiles;
_request.ContentType = "multipart/form-data; boundary=" + _boundary;
}
public void Do()
{
// Based on HTTP 1.1, if the server can determine the content length, it need not insist on
// us sending one. If you are talking
// to a "special" server, construct the headers beforehand, measure their length
// and identify the file lengths of the files to be sent.
using (var reqStream = _request.GetRequestStream())
using (var writer = new StreamWriter(reqStream))
{
writer.NewLine = "\r\n";
WriteBoundary(writer);
WriteParams(writer);
foreach (var file in _kfiles)
{
writer.WriteLine("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"",
file.Key,
Path.GetFileName(file.Value.Name));
writer.WriteLine("Content-Type: application/octet-stream");
writer.WriteLine();
WriteTheFileContent(reqStream, file.Value);
WriteBoundary(writer);
}
}
}
private static void WriteTheFileContent(Stream reqStream, Stream fileStream)
{
int bytesRead;
var buffer = new byte[4096];
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
reqStream.Write(buffer, 0, bytesRead);
}
private void WriteParams(StreamWriter writer)
{
foreach (var param in _kparams)
{
writer.WriteLine("Content-Disposition: form-data; name=\"{0}\"", param.Key);
writer.WriteLine();
writer.WriteLine(param.Value);
WriteBoundary(writer);
}
}
private void WriteBoundary(TextWriter writer)
{
writer.WriteLine("\r\n--{0}\r\n", _boundary);
}
}

UploadFile with POST values by WebClient

I want to upload file to a host by using WebClient class. I also want to pass some values which should be displayed in the $_POST array on the server part (PHP). I want to do it by one connect
I've used code bellow
using (WebClient wc = new WebClient())
{
wc.Encoding = Encoding.UTF8;
NameValueCollection values = new NameValueCollection();
values.Add("client", "VIP");
values.Add("name", "John Doe");
wc.QueryString = values; // this displayes in $_GET
byte[] ans= wc.UploadFile(address, dumpPath);
}
If i've used QueryString property, the values displayed in $_GET array.But i want to send it by post method

There's nothing built-in that allows you to do that. I have blogged about an extension that you could use. Here are the relevant classes:
public class UploadFile
{
public UploadFile()
{
ContentType = "application/octet-stream";
}
public string Name { get; set; }
public string Filename { get; set; }
public string ContentType { get; set; }
public Stream Stream { get; set; }
}
public byte[] UploadFiles(string address, IEnumerable<UploadFile> files, NameValueCollection values)
{
var request = WebRequest.Create(address);
request.Method = "POST";
var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
request.ContentType = "multipart/form-data; boundary=" + boundary;
boundary = "--" + boundary;
using (var requestStream = request.GetRequestStream())
{
// Write the values
foreach (string name in values.Keys)
{
var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}", name, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
}
// Write the files
foreach (var file in files)
{
var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"{2}", file.Name, file.Filename, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}", file.ContentType, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
file.Stream.CopyTo(requestStream);
buffer = Encoding.ASCII.GetBytes(Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
}
var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + "--");
requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);
}
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var stream = new MemoryStream())
{
responseStream.CopyTo(stream);
return stream.ToArray();
}
}
and now you could use it in your application:
using (var stream = File.Open(dumpPath, FileMode.Open))
{
var files = new[]
{
new UploadFile
{
Name = "file",
Filename = Path.GetFileName(dumpPath),
ContentType = "text/plain",
Stream = stream
}
};
var values = new NameValueCollection
{
{ "client", "VIP" },
{ "name", "John Doe" },
};
byte[] result = UploadFiles(address, files, values);
}
Now in your PHP script you could use the $_POST["client"], $_POST["name"] and $_FILES["file"].

If someone wants to use #darin-dimitrov s solution in an async pattern with progress reporting, that's the way to go (for .NET 4.0):
public void UploadFileAsync(NameValueCollection values, Stream fileStream)
{
//to fire events on the calling thread
_asyncOperation = AsyncOperationManager.CreateOperation(null);
var ms = new MemoryStream();
//make a copy of the input stream in case sb uses disposable stream
fileStream.CopyTo(ms);
//you cannot set stream position often enough to zero
ms.Position = 0;
Task.Factory.StartNew(() =>
{
try
{
const string contentType = "application/octet-stream";
var request = WebRequest.Create(_url);
request.Method = "POST";
var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
request.ContentType = "multipart/form-data; boundary=" + boundary;
boundary = "--" + boundary;
var dataStream = new MemoryStream();
byte[] buffer;
// Write the values
foreach (string name in values.Keys)
{
buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
dataStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}", name, Environment.NewLine));
dataStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);
dataStream.Write(buffer, 0, buffer.Length);
}
// Write the file
buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
dataStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes($"Content-Disposition: form-data; name=\"file\"; filename=\"file\"{Environment.NewLine}");
dataStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}", contentType, Environment.NewLine));
dataStream.Write(buffer, 0, buffer.Length);
ms.CopyTo(dataStream);
buffer = Encoding.ASCII.GetBytes(Environment.NewLine);
dataStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(boundary + "--");
dataStream.Write(buffer, 0, buffer.Length);
dataStream.Position = 0;
//IMPORTANT: set content length to directly write to network socket
request.ContentLength = dataStream.Length;
var requestStream = request.GetRequestStream();
//Write data in chunks and report progress
var size = dataStream.Length;
const int chunkSize = 64 * 1024;
buffer = new byte[chunkSize];
long bytesSent = 0;
int readBytes;
while ((readBytes = dataStream.Read(buffer, 0, buffer.Length)) > 0)
{
requestStream.Write(buffer, 0, readBytes);
bytesSent += readBytes;
var status = "Uploading... " + bytesSent / 1024 + "KB of " + size / 1024 + "KB";
var percentage = Tools.Clamp(Convert.ToInt32(100 * bytesSent / size), 0, 100);
OnFileUploaderProgressChanged(new FileUploaderProgessChangedEventArgs(status, percentage));
}
//get response
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var stream = new MemoryStream())
{
// ReSharper disable once PossibleNullReferenceException - exception would get catched anyway
responseStream.CopyTo(stream);
var result = Encoding.Default.GetString(stream.ToArray());
OnFileUploaderCompleted(result == string.Empty
? new FileUploaderCompletedEventArgs(FileUploaderCompletedResult.Failed)
: new FileUploaderCompletedEventArgs(FileUploaderCompletedResult.Ok));
}
}
catch (Exception)
{
OnFileUploaderCompleted(new FileUploaderCompletedEventArgs(FileUploaderCompletedResult.Failed));
}
}, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default);
}

This code is simple file upload.How to upload multi files with using this way.thx

public static void HttpUploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc)
{
Console.WriteLine(string.Format("Uploading {0} to {1}", file, url));
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
wr.ContentType = "multipart/form-data; boundary=" + boundary;
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream rs = wr.GetRequestStream();
string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
foreach (string key in nvc.Keys)
{
rs.Write(boundarybytes, 0, boundarybytes.Length);
string formitem = string.Format(formdataTemplate, key, nvc[key]);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
rs.Write(formitembytes, 0, formitembytes.Length);
}
rs.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
string header = string.Format(headerTemplate, paramName, file, contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
rs.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
rs.Write(trailer, 0, trailer.Length);
rs.Close();
WebResponse wresp = null;
try
{
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
Console.WriteLine(string.Format("File uploaded, server response is: {0}", reader2.ReadToEnd()));
}
catch (Exception ex)
{
Console.WriteLine("Error uploading file", ex.Message);
if (wresp != null)
{
wresp.Close();
wresp = null;
}
}
finally
{
wr = null;
}
}
static void Main(string[] args)
{
String token = args[0];
NameValueCollection nvc = new NameValueCollection();
nvc.Add("token", token);
nvc.Add("name", "mms-deneme");
nvc.Add("frame_count", "1");
nvc.Add("frame_1_text", "1. resim text");
nvc.Add("frame_1_duration", "15");
HttpUploadFile("https://api.turkcell.hedeflimesaj.com/mms.json",
#"C:\test\test.jpg", "frame_1_visual", "image/jpeg", nvc);
}
}
}

You may checkout the following blog post I wrote on this subject.
UPDATE:
Posting the source code as the link didn't work for the OP:
Have you ever been in a situation where you needed to upload multiple files to a remote host and pass additional parameters in the request? Unfortunately there's nothing in the BCL that allows us to achieve this out of the box.
We have the UploadFile method but it is restricted to a single file and doesn't allow us to pass any additional parameters. So let's go ahead and write such method. The important part is that this method must comply with RFC 1867 so that the remote web server can successfully parse the information.
First we define a model representing a single file to be uploaded:
public class UploadFile
{
public UploadFile()
{
ContentType = "application/octet-stream";
}
public string Name { get; set; }
public string Filename { get; set; }
public string ContentType { get; set; }
public Stream Stream { get; set; }
}
And here's a sample UploadFiles method implementation:
public byte[] UploadFiles(string address, IEnumerable<UploadFile> files, NameValueCollection values)
{
var request = WebRequest.Create(address);
request.Method = "POST";
var boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x", NumberFormatInfo.InvariantInfo);
request.ContentType = "multipart/form-data; boundary=" + boundary;
boundary = "--" + boundary;
using (var requestStream = request.GetRequestStream())
{
// Write the values
foreach (string name in values.Keys)
{
var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"{1}{1}", name, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes(values[name] + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
}
// Write the files
foreach (var file in files)
{
var buffer = Encoding.ASCII.GetBytes(boundary + Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.UTF8.GetBytes(string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"{2}", file.Name, file.Filename, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
buffer = Encoding.ASCII.GetBytes(string.Format("Content-Type: {0}{1}{1}", file.ContentType, Environment.NewLine));
requestStream.Write(buffer, 0, buffer.Length);
file.Stream.CopyTo(requestStream);
buffer = Encoding.ASCII.GetBytes(Environment.NewLine);
requestStream.Write(buffer, 0, buffer.Length);
}
var boundaryBuffer = Encoding.ASCII.GetBytes(boundary + "--");
requestStream.Write(boundaryBuffer, 0, boundaryBuffer.Length);
}
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var stream = new MemoryStream())
{
responseStream.CopyTo(stream);
return stream.ToArray();
}
}
And here's a sample usage:
using (var stream1 = File.Open("test.txt", FileMode.Open))
using (var stream2 = File.Open("test.xml", FileMode.Open))
using (var stream3 = File.Open("test.pdf", FileMode.Open))
{
var files = new[]
{
new UploadFile
{
Name = "file",
Filename = "test.txt",
ContentType = "text/plain",
Stream = stream1
},
new UploadFile
{
Name = "file",
Filename = "test.xml",
ContentType = "text/xml",
Stream = stream2
},
new UploadFile
{
Name = "file",
Filename = "test.pdf",
ContentType = "application/pdf",
Stream = stream3
}
};
var values = new NameValueCollection
{
{ "key1", "value1" },
{ "key2", "value2" },
{ "key3", "value3" },
};
byte[] result = UploadFiles("http://localhost:1234/upload", files, values);
}
In this example we are uploading 3 values and 3 files to the remote host.