我在我的应用程序中添加了语音合成。它有效,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() 方法取消当前语音但发生异常我不知道为什么。你知道问题出在哪里吗?
异常
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
最佳答案
由于您想取消异步操作,您可以使用从 SpeakTextAsync
返回的 IAsyncAction
而不是使用 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);
}
}
关于c# - 在windows phone 8中取消语音合成,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15680027/