Windows phone에서 음성 합성 취소 8

Question

내 음성 합성을 응용 프로그램에 추가합니다. 그것은 작동하지만 문제는 내가 연설을 취소 할 수 없다는 것입니다 ... 예를 들어, 다른 페이지로 이동하면 연설은 계속됩니다 ... 그래서, 현재 연설을 취소하기 위해 CancelAll() 메서드를 호출하지만 예외가 발생했습니다 왜 그런지 모르겠다. 무슨 문제인지 아십니까?

예외

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). 

내 코드 : 당신이 IAsyncAction 대신 await을 사용 SpeakTextAsync에서 반환 사용할 수있는 비동기 작업을 취소 할 때문에

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); 
     } 
    } 

당신

Answer 1

감사드립니다.

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); 
    } 
}