ContinuousRecognitionSession.StartAsync（）返回“访问被拒绝”

Question

我正在尝试激活台式机（Windows 10）上的麦克风以实现一些语音识别代码。这是我开箱即用的简单UWP应用程序：

致电ContinuousRecognitionSession.StartAsync() 投掷：

ex = {System.UnauthorizedAccessException: Access is denied.

        public MainPage()
    {
        this.InitializeComponent();
        initializeSpeechRecognizer();
    }

    // Initialize Speech Recognizer and start async recognition
    private async void initializeSpeechRecognizer()
    {
        // Initialize recognizer
        mRecognizer = new SpeechRecognizer();

        // Load Grammer file constraint
        string fileName = String.Format(SRGS_FILE);
        var path = Package.Current.InstalledLocation;
        StorageFile grammarContentFile = await path.GetFileAsync(fileName);

        SpeechRecognitionGrammarFileConstraint grammarConstraint = new SpeechRecognitionGrammarFileConstraint(grammarContentFile);

        // Add to grammer constraint
        mRecognizer.Constraints.Add(grammarConstraint);

        // Compile grammer
        SpeechRecognitionCompilationResult compilationResult = await mRecognizer.CompileConstraintsAsync();

        Debug.WriteLine("Status: " + compilationResult.Status.ToString());
        Debug.WriteLine("Result: " + compilationResult.ToString());
    }

    private async void Page_Loaded(object sender, RoutedEventArgs e)
    {
        try
        {
            await mRecognizer.ContinuousRecognitionSession.StartAsync();
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }
    }

我已将Microphone添加到Manifest功能中。 我桌面上的麦克风处于活动状态且正常工作。 我目前的语言是en-US，它列在SupportedTopicLanguages中 和SupportedGrammarLanguages属性。 Visual Studio 2017以管理员模式运行。