ACRCloudUploadFile.ACRCloudUploadFile.PostHttp C# (CSharp) Method

        public static string PostHttp(string url, IDictionary<string, Object> headerParams, IDictionary<string, Object> postParams, int timeoutSecond)
        {
            string result = "";
            string BOUNDARYSTR = "acrcloud***copyright***2015***" + DateTime.Now.Ticks.ToString("x");
            string BOUNDARY = "--" + BOUNDARYSTR + "\r\n";
            var ENDBOUNDARY = Encoding.ASCII.GetBytes("--" + BOUNDARYSTR + "--\r\n\r\n");

            var stringKeyHeader = BOUNDARY +
                           "Content-Disposition: form-data; name=\"{0}\"" +
                           "\r\n\r\n{1}\r\n";
            var filePartHeader = BOUNDARY +
                            "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n" +
                            "Content-Type: application/octet-stream\r\n\r\n";

            var memStream = new MemoryStream();
            foreach (var item in postParams)
            {
                if (item.Value is string)
                {
                    string tmpStr = string.Format(stringKeyHeader, item.Key, item.Value);
                    byte[] tmpBytes = Encoding.UTF8.GetBytes(tmpStr);
                    memStream.Write(tmpBytes, 0, tmpBytes.Length);
                }
                else if (item.Value is byte[])
                {
                    var header = string.Format(filePartHeader, "audio_file", "audio_file");
                    var headerbytes = Encoding.UTF8.GetBytes(header);
                    memStream.Write(headerbytes, 0, headerbytes.Length);
                    byte[] sample = (byte[])item.Value;
                    memStream.Write(sample, 0, sample.Length);
                    memStream.Write(Encoding.UTF8.GetBytes("\r\n"), 0, 2);
                }
            }
            memStream.Write(ENDBOUNDARY, 0, ENDBOUNDARY.Length);

            HttpWebRequest request = null;
            HttpWebResponse response = null;
            Stream writer = null;
            StreamReader myReader = null;
            try
            {
                request = (HttpWebRequest)WebRequest.Create(url);
                request.Timeout = timeoutSecond * 1000;
                request.Method = "POST";
                foreach (var item in headerParams)
                {
                    if (item.Value is string)
                    {
                        request.Headers.Add(item.Key+":"+item.Value);
                    }
                }
                request.ContentType = "multipart/form-data; boundary=" + BOUNDARYSTR;

                memStream.Position = 0;
                byte[] tempBuffer = new byte[memStream.Length];
                memStream.Read(tempBuffer, 0, tempBuffer.Length);

                writer = request.GetRequestStream();
                writer.Write(tempBuffer, 0, tempBuffer.Length);
                writer.Flush();
                writer.Close();
                writer = null;

                response = (HttpWebResponse)request.GetResponse();
                myReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                result = myReader.ReadToEnd();
            }
            catch (WebException e)
            {
                Console.WriteLine("timeout:\n" + e.ToString());
            }
            catch (Exception e)
            {
                Console.WriteLine("other excption:" + e.ToString());
            }
            finally
            {
                if (memStream != null)
                {
                    memStream.Close();
                    memStream = null;
                }
                if (writer != null)
                {
                    writer.Close();
                    writer = null;
                }
                if (myReader != null)
                {
                    myReader.Close();
                    myReader = null;
                }
                if (request != null)
                {
                    request.Abort();
                    request = null;
                }
                if (response != null)
                {
                    response.Close();
                    response = null;
                }
            }

            return result;
        }