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  • Upload files with HTTPWebrequest (multipart/form-data)

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    Hi, Some times we need to upload files on a web server using HttpWebRequest.

    For that first we need to define a model (class) that represents the uploaded file property.

    public class UploadFile
    {       
       public string Name { get; set; }
       public string Filename { get; set; }
       public string ContentType { get; set; }
       public Stream Stream { get; set; }
    }
    

    Use below sample code for uploading files using httpWebRequest.

    public byte[] UploadFilesToServer(string address, IEnumerable files, NameValueCollection values)
        {
            var request = WebRequest.Create(address);
            request.Method = "POST";
            var boundary = "---------------------------" + DateTime.Now.ToString("a", 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();
            }
        }
    

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