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Posting a file: .NET calling a WebScript:

Question asked by eg on Feb 21, 2008
Latest reply on Feb 22, 2008 by eg
I am trying to post a file to alfresco by calling a web script from a .net application. I have tested the webscript by calling it from a html form that posts the file and it works fine.

When I try it from the .net app the formdata.fields collection always contains 0 items.

The main .net code is shown below.

Any help appreciated.

Thanks,

public static string UploadFileEx(string uploadfile, string url,
string fileFormName, string contenttype, NameValueCollection querystring,
CookieContainer cookies)
{
if ((fileFormName == null) ||
(fileFormName.Length == 0))
{
fileFormName = "file";
}

if ((contenttype == null) ||
(contenttype.Length == 0))
{
contenttype = "application/octet-stream";
}


string postdata;
postdata = "?";
if (querystring != null)
{
foreach (string key in querystring.Keys)
{
postdata += key + "=" + querystring.Get(key) + "&";
}
}
Uri uri = new Uri(url + postdata);


string boundary = "———-" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
webrequest.CookieContainer = cookies;
webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
webrequest.Method = "POST";


// Build up the post message header

StringBuilder sb = new StringBuilder();
sb.Append("–");
sb.Append(boundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=\"");
sb.Append(fileFormName);
sb.Append("\"; filename=\"");
sb.Append(Path.GetFileName(uploadfile));
sb.Append("\"");
sb.Append("\r\n");
sb.Append("Content-Type: ");
sb.Append(contenttype);
sb.Append("\r\n");
sb.Append("\r\n");

string postHeader = sb.ToString();
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

// Build the trailing boundary string as a byte array

// ensuring the boundary appears on a line by itself

byte[] boundaryBytes =
Encoding.ASCII.GetBytes("\r\n–" + boundary + "\r\n");

FileStream fileStream = new FileStream(uploadfile,
FileMode.Open, FileAccess.Read);
long length = postHeaderBytes.Length + fileStream.Length +
boundaryBytes.Length;
webrequest.ContentLength = length;

Stream requestStream = webrequest.GetRequestStream();

// Write out our post header

requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

// Write out the file contents

byte[] buffer = new Byte[checked((uint)Math.Min(4096,
(int)fileStream.Length))];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
requestStream.Write(buffer, 0, bytesRead);

// Write out the trailing boundary

requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
WebResponse responce = webrequest.GetResponse();
Stream s = responce.GetResponseStream();
StreamReader sr = new StreamReader(s);

return sr.ReadToEnd();
}

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