取消语音合成中的Windows Phone 8 [英] Cancel speech synthesis in windows phone 8

问题描述

我添加了一个语音合成到我的应用程序。它的工作原理，但问题是我无法取消演讲......例如，当我浏览到另一个页面，讲话继续......所以，我呼吁CancelAll（）方法来取消当前讲话，但有异常发生我不知道为什么。你知道是什么问题？

例外

 第一类型'System.Threading.Tasks.TaskCanceledException'的机会异常出现在mscorlib.ni.dll 
型'System.Threading.Tasks.TaskCanceledException的异常出现在mscorlib.ni.dll之前没有处理一个管理/本地边界
型'System.Threading.Tasks.TaskCanceledException的异常出现在mscorlib.ni.dll和管理/本地边界
方案[2576]前没有处理TaskHost.exe已退出，代码为-1（为0xffffffff）。 
  

我的代码：

 私人SpeechSynthesizer合成=新SpeechSynthesizer（）; 
 
保护覆盖无效OnBackKeyPress（CancelEventArgs E）
 {
 //我想在这里也取消，但它是相同的异常... 
} 
 
 //方​​法调用，当我按下一个按钮，取消
私人无效ButtonCancelSpeech（对象发件人，EventArgs EventArgs的）
 {
试
 {
 synth.CancelAll （）; 
} 
赶上（TaskCanceledException）
 {
 //我在这个异常
到达} 
} 
 
私人异步无效BtnSpeech_Click（对象发件人，EventArgs五）
 {
 IEnumerable的< VoiceInformation>从语音的声音=以InstalledVoices.All 
，其中voice.Language.Substring（0,2）.Equals（LanguageApp.GetLangage2Characters（））
选择的声音; 
如果（voices.ElementAt（0）！= NULL）
 {
 //作为确定由查询设置的声音。 
 synth.SetVoice（voices.ElementAt（0））; 
 
等待synth.SpeakTextAsync（_place.Description）; 
} 
} 
  

感谢您

< DIV CLASS =h2_lin>解决方案

既然要取消您可以使用异步操作的 IAsyncAction 从 SpeakTextAsync 而不是使用等待。

 私人SpeechSynthesizer合成=新SpeechSynthesizer（）; 
私人IAsyncAction任务; 
 
私人无效ButtonCancelSpeech（对象发件人，EventArgs EventArgs的）
 {
试
 {
 //取消异步任务本身
任务。取消（）; 
} 
赶上（TaskCanceledException）
 {
 
} 
} 
 
私人无效BtnSpeech_Click（对象发件人，EventArgs的发送） 
 {
 IEnumerable的< VoiceInformation>从语音的声音=以InstalledVoices.All 
，其中voice.Language.Substring（0,2）.Equals（LanguageApp.GetLangage2Characters（））
选择的声音; 
如果（voices.ElementAt（0）！= NULL）
 {
 //作为确定由查询设置的声音。 
 synth.SetVoice（voices.ElementAt（0））; 
 
 =任务synth.SpeakTextAsync（_place.Description）; 
} 
} 
  

I add a speech synthesis to my app. It works but the problem is I can't cancel the speech...For example, when I navigate to another page, the speech continues... So, I call CancelAll() method to cancel the current speech but an exception is occured and I don't know why. Do you know what's the problem?

The exception

A first chance exception of type 'System.Threading.Tasks.TaskCanceledException' occurred in mscorlib.ni.dll
An exception of type 'System.Threading.Tasks.TaskCanceledException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
An exception of type 'System.Threading.Tasks.TaskCanceledException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
The program '[2576] TaskHost.exe' has exited with code -1 (0xffffffff).

My code:

    private SpeechSynthesizer synth = new SpeechSynthesizer();

    protected override void OnBackKeyPress(CancelEventArgs e)
    {
        //I tried to cancel also here but it's the same exception...
    }

    //method called when I press a button Cancel
    private void ButtonCancelSpeech(object sender, EventArgs eventArgs)
    {
        try
        {
            synth.CancelAll();
        }
        catch (TaskCanceledException)
        {
            //I arrive in this exception
        }
    }

    private async void BtnSpeech_Click(object sender, EventArgs e)
    {
        IEnumerable<VoiceInformation> voices = from voice in InstalledVoices.All
                                                     where voice.Language.Substring(0, 2).Equals(LanguageApp.GetLangage2Characters())
                                                     select voice;
        if (voices.ElementAt(0) != null)
        {
            // Set the voice as identified by the query.
            synth.SetVoice(voices.ElementAt(0));

            await synth.SpeakTextAsync(_place.Description);
        }
    }

Thank you

解决方案

Since you want to cancel the async operation you can use the IAsyncAction returned from SpeakTextAsync instead of using await.

private SpeechSynthesizer synth = new SpeechSynthesizer();
private IAsyncAction task;

private void ButtonCancelSpeech(object sender, EventArgs eventArgs)
{
    try
    { 
        //cancel the async task itself
        task.Cancel();
    }
    catch (TaskCanceledException)
    {

    }
    }

private void BtnSpeech_Click(object sender, EventArgs e)
{
    IEnumerable<VoiceInformation> voices = from voice in InstalledVoices.All
                                                     where voice.Language.Substring(0, 2).Equals(LanguageApp.GetLangage2Characters())
                                                     select voice;
    if (voices.ElementAt(0) != null)
    {
        // Set the voice as identified by the query.
        synth.SetVoice(voices.ElementAt(0));

        task = synth.SpeakTextAsync(_place.Description);
    }
}

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