Windows Phone 8 SpeechSynthesizer暂停

Question

我正在开发一个应用程序，当SpeechSynthesizer.SpeakTextAsync正在运行并从此处恢复时，我想暂停该应用程序。

await synthesizer.SpeakTextAsync(text); 

终止阅读时var stop = true;

Answer 1

有人在这里贴了一段时间后，在同一时间，我刷新页面，看他的回答，看到了一个通知&再次刷新页面&答案不见了。但是谁发布，他是一个拯救生命的人。它卡住了我的想法，我最终创造了这个。

String text; // your text to read out loud 
    String[] parts = text.Split(' '); 
    int max = parts.Length; 
    int count = 0; 

    private String makeSSML() { 
     if (count == max) { 
      count= 0; 
     } 
     String s = "<speak version=\"1.0\" "; 
     s += "xmlns=\"http://www.w3.org/2001/10/synthesis\" xml:lang=\"en-US\">"; 
     for (int i = count; i < max; i++) 
     { 
      s += parts[i]; 
      s += "<mark name=\"anything\"/>"; 
     } 
     s += "<mark name=\"END\"/>"; 
     s += "</speak>"; 
     return s; 
    } 

    private void playIT(){ 
     synth = new SpeechSynthesizer(); 
     synth.BookmarkReached += synth_BookmarkReached; 
     synth.SpeakSsmlAsync(makeSSML()); 
    } 

    private void synth_BookmarkReached(object sender, SpeechBookmarkReachedEventArgs e) 
    { 
     count++; 
     if (e.Bookmark == "END") { 
      synth.Dispose(); 
     } 
    } 

    private void Pause_Click(object sender, RoutedEventArgs e) 
    { 
     synth.Dispose(); 
    } 

谢谢你，你的回答给了我这个主意。

Answer 2

那么，根据文档，当您拨打CancellAll时，您将取消正在异步执行的任务。根据合同，这导致OperationCancelledException被抛出。这意味着无论您在哪里调用SpeakTextAsync，SpeakSsmlAsync或SpeakSsmlFromUriAsync，都必须使用try/catch语句来包围这些调用，以防止此异常未被捕获。

例子：

private static SpeechSynthesizer synth; 

public async static Task<SpeechSynthesizer> SpeechSynth(string dataToSpeak) 
     { 
      synth = new SpeechSynthesizer(); 
      IEnumerable<VoiceInformation> englishVoices = from voice in InstalledVoices.All 
                  where voice.Language == "en-US" 
                  && voice.Gender.Equals(VoiceGender.Female) 
                  select voice; 
      if (englishVoices.Count() > 0) 
      { 
       synth.SetVoice(englishVoices.ElementAt(0)); 
      } 

      await synth.SpeakTextAsync(dataToSpeak); 

      return synth; 
     } 


public static void CancelSpeech() 
     { 
      synth.CancelAll(); 
     } 

现在叫你想要的SpeechSynth("Some Data to Speak")，每当你想取消它，只需调用CancelSpeech()。

它完成了！请享用...！