Azure语音转录无识别结果：UI触发转录功能失效求助

我在UI中设置了启动转录流程的按钮，但该功能无法正常工作。目前仅能看到SessionStarted事件输出的------> Started，Recognizing和Recognized事件无任何输出，无法完成语音转文字，已确认传入参数齐全，请求排查解决。

相关代码 #

AzureTranscriptionService服务代码 #

public List<char> Letters { get; set; }

public StringBuilder Builder { get; set; }

public AzureTranscriptionService() {
    Letters = new List<char>();
    Builder = new StringBuilder();
}

public async Task<string> ConvertToTextAsync(
    string FilePath,
    string Language,
    string WordDocName) {

    //Configure speech service
    var config = SpeechConfig.FromSubscription
        (ConstantsHelpers.AZURE_KEY,
        ConstantsHelpers.AZURE_REGION);

    config.EnableDictation();
    config.SpeechRecognitionLanguage = Language;

    //Configure speech recognition
    var taskCompleteionSource = new TaskCompletionSource<int>();

    using var audioConfig = AudioConfig.FromWavFileInput(FilePath);
    {
        using var speechRecognizer = new SpeechRecognizer(config, audioConfig);

        speechRecognizer.Recognized += (sender, e) => {
            if (e.Result.Reason == ResultReason.RecognizedSpeech) {
                foreach (var c in e.Result.Text) {
                    Letters.Add(c);
                    Debug.WriteLine(c);
                }
            }
        };

        speechRecognizer.SessionStarted += (sender, e) => {
            Debug.WriteLine("------> Started");
        };

        speechRecognizer.SessionStopped += (sender, e) => {
            Debug.WriteLine("Stop");
            foreach (var item in Letters) {
                Builder.Append(item);
            }
        };

        speechRecognizer.Recognizing += (sender, e) => {
            Debug.WriteLine(e.Result.Text);
        };

        await speechRecognizer.StartContinuousRecognitionAsync()
            .ConfigureAwait(false);

        Task.WaitAny(new[] { taskCompleteionSource.Task });

        await speechRecognizer.StopContinuousRecognitionAsync()
            .ConfigureAwait(false);
    }

    return Builder.ToString();
}

主ViewModel调用代码 #

private async void StartAction(object obj) {
    var FileWithoutExtension = Path.GetFileNameWithoutExtension(FilePath);

    var AudioPath = FolderHelper.CreateFolder(ConstantsHelpers.AUDIO);
    var DocumentPath = FolderHelper.CreateFolder();

    var AudioFileNamePath = Path.Combine(AudioPath, $"{FileWithoutExtension}{ConstantsHelpers.WAV}");
    var ConvertedAudioPath = AudioHelper.Converter(FilePath!, AudioFileNamePath);

    var DocumentName = Path.Combine(DocumentPath, $"{FileWithoutExtension}{ConstantsHelpers.DOCX}");

    await AzureTranscription.ConvertToTextAsync(ConvertedAudioPath, SelectedItem, DocumentName);
}

排查方向 #

• 任务完成源未触发：代码中用Task.WaitAny(new[] { taskCompleteionSource.Task })等待流程结束，但taskCompleteionSource从未被标记为完成，导致识别逻辑一直阻塞，无法处理音频内容。需要在音频识别会话结束或音频播放完成时调用taskCompleteionSource.SetResult(0)。
• 音频格式不兼容：确认ConvertedAudioPath对应的WAV文件是否符合Azure Speech Service要求（推荐16kHz采样率、16位单声道PCM编码），可通过音频工具（如Audacity）检查属性，或在创建AudioConfig时明确指定格式参数。
• SessionStopped事件未触发：当前依赖SessionStopped拼接结果，若会话未正常终止，这部分逻辑不会执行。建议直接在Recognized事件中更新Builder，无需先存到Letters列表再拼接，减少中间环节的问题。
• 异步阻塞风险：Task.WaitAny在异步方法中可能引发死锁，建议替换为await taskCompleteionSource.Task，同时确保ConfigureAwait(false)的使用场景合理。
• 缺失错误监听：添加Canceled事件监听，排查是否存在识别错误或取消情况：

  speechRecognizer.Canceled += (sender, e) => {
      Debug.WriteLine($"识别取消：{e.Reason}，错误详情：{e.ErrorDetails}");
      taskCompleteionSource.SetResult(0);
  };
  

内容的提问来源于stack exchange，提问作者edu