我在我的应用程序中添加了语音合成。它可以工作,但问题是我无法取消语音...例如,当我导航到另一个页面时,语音继续...所以,我调用 CancelAll() 方法来取消当前语音但发生异常我不知道为什么。你知道有什么问题吗?
例外
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).
我的代码:
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);
}
}
谢谢