视频文件上传的接口并分块上传

public static bool httpPost(string url, ref CookieContainer cc, ref string dataToPost, ref string dataget, bool isChangeCookie = false)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.AllowAutoRedirect = false;
            request.KeepAlive = true;
            request.Method = "POST";
            request.ProtocolVersion = HttpVersion.Version11;
            request.Proxy = WebRequest.DefaultWebProxy;
            request.Credentials = CredentialCache.DefaultCredentials;
            request.Headers.Add("Cache-Control: max-age=0");
            request.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
            request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4,zh-TW;q=0.2,fr;q=0.2,ja;q=0.2");
            request.ContentType = "application/x-www-form-urlencoded";
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2008.2 Safari/537.36";
            request.CookieContainer = cc;
            try
            {
                StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.ASCII);
                writer.Write((string)dataToPost);
                writer.Flush();
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                if (response.ContentEncoding == "gzip")
                {
                    MemoryStream ms = new MemoryStream();
                    GZipStream zip = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress);
                    byte[] buffer = new byte[1024];
                    int l = zip.Read(buffer, 0, buffer.Length);
                    while (l > 0)
                    {
                        ms.Write(buffer, 0, l);
                        l = zip.Read(buffer, 0, buffer.Length);
                    }
                    ms.Dispose();
                    zip.Dispose();
                    dataget = Encoding.UTF8.GetString(ms.ToArray());
                }
                else
                    dataget = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("UTF-8")).ReadToEnd();
                response.Close();
                request.Abort();
                return true;
            }
            catch (WebException exception)
            {
                if (exception.Response != null)
                {
                    dataget = ((HttpWebResponse)exception.Response).StatusCode.ToString();
                }
                request.Abort();
                return false;
            }
            catch
            {
                dataget = "error";
                request.Abort();
                return false;
            }
        }
    }
    public class SearchNews
    {
        public string location { get; set; }
        public string fileName { get; set; }
        public string FlagString { get; set; }
        public string Flag { get; set; }
    }

public void Test(string path)
        {
            System.Net.CookieContainer cc = null;
            using (FileStream fs = new FileStream(path, FileMode.Open))
            {
                //缓冲区太小的话，速度慢而且伤硬盘
                //声明一个4兆字节缓冲区大小，比如迅雷也有一个缓冲区，如果没有缓冲区的话，
                //每下载一个字节都要往磁盘进行写，非常伤磁盘，所以，先往内存的缓冲区写字节，当
                //写够了一定容量之后，再往磁盘进行写操作，减低了磁盘操作。
                byte[] bytes = new byte[1024*1024*5];
                int readBytes;
                //第二个参数Offset表示当前位置的偏移量，一般都传0
                int partNum = 1;
                while ((readBytes = fs.Read(bytes, 0, bytes.Length)) > 0) //读取的位置自动往后挪动。
                {
                    //readBytes为实际读到的byte数，因为最后一次可能不会读满。
                    //outStream.Write(bytes, 0, readBytes);
                    //byte[] fileData = new byte[outStream.Length];
                    byte[] buffer = bytes.Take(readBytes).ToArray();
                    //fs.Read(buffer, 0, readBytes);
                    string part = HttpUtility.UrlEncode(Convert.ToBase64String(buffer));

                    string dataGet = "";
                    string dataToPost = "{\"access_id\":\"1230\",\"access_key\":\"abc\",\"fileName\":\"test009.mp4\",\"part\":\"" + part + "\",\"partNum\":" + partNum + "}";
                    HttpPost.httpPost("http://xxxxxx/v2/DVR.UploadPart", ref cc, ref dataToPost, ref dataGet);
                    partNum++;
                    JavaScriptSerializer js = new JavaScriptSerializer();
                    SearchNews sn = js.Deserialize<SearchNews>(dataGet);
                }

                string dataToPostCom = "{\"access_id\":\"1230\",\"access_key\":\"abc\",\"fileName\":\"test009.mp4\"}";
                string dataGetCom = "";
                HttpPost.httpPost("http://xxxxxxxx/v2/DVR.UploadComplete", ref cc, ref dataToPostCom, ref dataGetCom);
                JavaScriptSerializer js1 = new JavaScriptSerializer();
                SearchNews sn1 = js1.Deserialize<SearchNews>(dataGetCom);

            }
        }