Windows Phone 8 SpeechSynthesizer暂停

Question

我正在开发一个应用程序，我想在SpeechSynthesizer.SpeakTextAsync运行时暂停，然后从那里恢复。

await synthesizer.SpeakTextAsync(text);

当var stop = true;出现时停止阅读

Answer 1

前段时间有人在这里发帖，同时我刷新了页面，阅读了他的答案，看到一条通知，又刷新了页面&答案不见了。但无论是谁发布的，他都是救命稻草。它卡在我的脑海里，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，你的回答给了我灵感。

Answer 2

根据文档，当您调用CancellAll时，您将取消异步执行的任务。根据约定，这会导致抛出OperationCancelledException。这意味着，无论您在何处调用SpeakTextAsync、SpeakSsmlAsync或SpeakSsmlFromUriAsync，都必须使用try/catch语句将这些调用括起来，以防止此异常无法捕获。

示例：

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，在您想要取消的地方调用SpeechSynth("Some Data to Speak")，只要调用CancelSpeech()即可。

完成了！尽情享受吧！