AWSSDK.Transcribe StartTranscriptionJob completion

Question

我编写了以下使用 AWSSDK.Transcribe 转录音频文件的代码。 代码执行并返回状态为 OK 的响应，但对象 response.TranscriptionJob.Transcript 为 null 我想出的解释是，它只表示工作开始，一位同事告诉我，我需要现在轮询结果或使用 AWS Step Functions 或 AWS Lambda 来监控工作完成...还有其他选择吗供我使用以便知道转录何时完成？

    public static string Transcribe(string inputAudioFilePath)
    {
        var awsCredentials = new BasicAWSCredentials(accessKey, secretKey);
        // North CA, for streaming "us-west-2"
        var config = new AmazonTranscribeServiceConfig { RegionEndpoint = RegionEndpoint.GetBySystemName("us-west-2") }; 

        AmazonTranscribeServiceClient client = new AmazonTranscribeServiceClient(awsCredentials, config);
        client.AfterResponseEvent += Client_AfterResponseEvent;

        var jobName = String.Format("AWSSTT-{0}", DateTime.Now.ToString("yyyy-MM-dd-hh-mm-t"));
        var inputLanguage = "en-US";

        #region Upload File to S3 Bucket

        string s3BucketName = "tts-experiment";
        string s3KeyName = inputAudioFilePath;


        mAmazonS3Client = new AmazonS3Client(accessKey, secretKey, mRegionEndpoint);
        string s3MediaUrl = UploadFileToS3(inputAudioFilePath, s3BucketName, s3KeyName);
        string ext = Path.GetExtension(inputAudioFilePath).ToUpper();
        MediaFormat mediaFormat = MediaFormat.Wav;
        if (String.Compare(ext, ".MP3", true) == 0)
            mediaFormat = MediaFormat.Mp3;

        #endregion

        var media = new Media() { MediaFileUri = s3MediaUrl };
        var request = new StartTranscriptionJobRequest
        {
            TranscriptionJobName = jobName,
            LanguageCode = inputLanguage,
            Media = media,
            MediaFormat = MediaFormat.Mp3,
        };

        try
        {
            string text = "";
            StartTranscriptionJobResponse response = client.StartTranscriptionJob(request);
            if (response.HttpStatusCode == System.Net.HttpStatusCode.OK)
            {
                Console.WriteLine("Transcription completed successfully");

                if (response.TranscriptionJob.Transcript != null && response.TranscriptionJob.Transcript.TranscriptFileUri != null)
                {
                    string transcriptUrl = response.TranscriptionJob.Transcript.TranscriptFileUri.ToString();
                    WebClient webClient = new WebClient();

                    string targetDir = Path.Combine(Program.InstallDir, @"TTSExperiment\Transcribed");
                    if (!Directory.Exists(targetDir))
                    {
                        Directory.CreateDirectory(targetDir);
                    }
                    string localFilePath = Path.Combine(targetDir, Path.GetFileNameWithoutExtension(transcriptUrl) +".txt");
                
                    webClient.DownloadFile(transcriptUrl, localFilePath);

                    text = File.ReadAllText(localFilePath);

                    Console.WriteLine($"Transcription job {jobName} completed.");
                }
                else
                {
                    Console.WriteLine("No Transcript created");
                }
                return text;
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error starting transcription job: {ex.Message}");
        }

        return "";
    }