Upload file with HttpWebRequest

Question

Here is my code:

private void UploadFilesToRemoteUrl(string url, string[] files, string logpath, NameValueCollection nvc)
        {
            long length = 0;
            string boundary = "----------------------------" +
            DateTime.Now.Ticks.ToString("x");

            HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create(url);
            httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary;
            httpWebRequest2.Method = "POST";
            httpWebRequest2.KeepAlive = true;
            httpWebRequest2.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}";

            foreach(string key in nvc.Keys)
            {
                string formitem = string.Format(formdataTemplate, key, nvc[key]);
                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
                memStream.Write(formitembytes, 0, formitembytes.Length);
            }


            memStream.Write(boundarybytes,0,boundarybytes.Length);

            string headerTemplate = "Content-Disposition: form-data; name=\"{0}\";filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";

            for(int i=0;i<files.Length;i++)
            {

                string header = string.Format(headerTemplate,"file"+i,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();
            }

            httpWebRequest2.ContentLength = memStream.Length;

            Stream requestStream = httpWebRequest2.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();


            WebResponse webResponse2 = httpWebRequest2.GetResponse();
            Stream stream2 = webResponse2.GetResponseStream();
            StreamReader reader2 = new StreamReader(stream2);

            MessageBox.Show(reader2.ReadToEnd());

            webResponse2.Close();
            httpWebRequest2 = null;
            webResponse2 = null;

        }

And here is how I call it:

string[] filenames = new string[] { @"C:\Users\John\Desktop\ex.txt" };
NameValueCollection nvc = new NameValueCollection();
nvc.Add("cmd", "new");
nvc.Add("sTitle", "bugX");
nvc.Add("token", "someToken");
UploadFilesToRemoteUrl("https://myUrl.fogbugz.com/api.asp", filenames, "", nvc);

And everything is working fine, except the file isn't uploaded.

I also tried this code:

http://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data

and the same thing happens. How to resolve this?

Here is the response from the server:

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<response>
    <case ixBug=\"123486\" operations=\"edit,assign,resolve,email,remind\"></case>
</response>

score 0 · Accepted Answer · answered Feb 10 '12 at 10:12

0

you're just sending a stream to the server, it's impossible to know what happens at the server for us if you don't provide any code for us from the server side. I guess you've forgotten to receive and create the file on the server side.

if this is not the problem I would suggest you get the invaluable tool fiddler and start catching your httprequests and see what they contain.

answered Feb 10 '12 at 10:12

Thomas Lindvall

599
6
13

Have you written the server side code? Or are you working against a API? – Thomas Lindvall Feb 10 '12 at 13:09
Thanks .care to read my links https://stackoverflow.com/questions/52120664/recieve-accept-file-from-httpwebrequest-post-or-put-in-asp-net – KumarHarsh Sep 01 '18 at 06:31

Upload file with HttpWebRequest

1 Answers1