初始化SpeechSynthesizer时出现UnauthorizedAccessException

Question

我正在使用Microsofts SpeechSynthesizer为我的Windows Phone应用程序创建音频输出。我用这个代码

private async void TextToSpeech_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
    SpeechSynthesizer synth = new SpeechSynthesizer();

    await synth.SpeakTextAsync("You have a meeting with Peter in 15 minutes.");
}

我得到了这个例外：

{System.UnauthorizedAccessException: Access is denied.

at Windows.Phone.Speech.Synthesis.SpeechSynthesizer..ctor()
at NerdQuiz.Question.<TextToSpeech_Tap>d__1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__0(Object state)}

我发现错误发生在

new SpeechSynthesizer();

Answer 1

确保已将功能ID_CAP_SPEECH_RECOGNITION添加到应用程序清单（WMAppManifest.xml）。

Answer 2

在Windows通用应用程序（UWP应用程序）中，使用 SpeechSynthetizer需要麦克风功能。 （我不知道为什么，但一旦启用我就不再得到例外了）