/// <summary>设置返回值
        /// </summary>
        private void HandleReceivedPack(ReceivedPackage package)
        {
            try
            {
                //返回为Strem,需要逐步进行解析

                _resp.Header = new FastDFSHeader(package.Length, package.Command, package.Status);

                if (!_context.IsOutputStream)
                {
                    _resp.LoadContent(Configuration, package.Body);
                }

                _context = null;
                _tcs.SetResult(_resp);

                //释放
                ReferenceCountUtil.SafeRelease(package);
            }
            catch (Exception ex)
            {
                Logger.LogError("接收返回信息出错! {0}", ex);
                throw;
            }
        }
        private async void DoReceive()
        {
            while (!_cts.IsCancellationRequested && IsConnected)
            {
                var package = await _client.ReceiveAsync();

                if (package == null)
                {
                    break;
                }

                if (package.IsOutputStream)
                {
                    if (!_hasWriteFile)
                    {
                        _fileStream   = new FileStream(package.OutputFilePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
                        _hasWriteFile = true;
                    }

                    //写入文件
                    await _fileStream.WriteAsync(package.Body, 0, package.Body.Length);

                    //刷新到磁盘
                    if (!package.IsComplete)
                    {
                        continue;
                    }

                    await _fileStream.FlushAsync();
                }

                //返回为Strem,需要逐步进行解析

                _resp.Header = new FastDFSHeader(package.Length, package.Command, package.Status);

                if (!_context.IsOutputStream)
                {
                    _resp.LoadContent(Configuration, package.Body);
                }
                Reset();
                _tcs.SetResult(_resp);
            }
        }