CODEWITHSUNDEEP
c#asynchronousasync-awaituwpuwp-xaml
manish
manish

Reputation: 101

How to combine asynchronous method with synchronous method in C#?

I'm calling from the main method: 

public MainPage()
{
  Text_to_Speech.changetospeech("Welcome to Nepal!", newmedia).Wait();
  mytxtblck.Text="Hello from Nepal!"
}

What I really want to do is Wait until "Welcome to Nepal" is being spoken and then write "Hello" in mytextblck.

I've gone to several threads and worked, but nothing could make it work.

public async static Task changetospeech(string text, MediaElement mediaa)
{
   var synth = new SpeechSynthesizer();
   var voices = SpeechSynthesizer.AllVoices;

   synth.Voice = voices.First(x => x.Gender == VoiceGender.Female );
   SpeechSynthesisStream stream = await synth.SynthesizeTextToStreamAsync(text);

   MediaElement media = mediaa;
   media.SetSource(stream,stream.ContentType);
   media.Play();   
}

Upvotes: 3

Views: 658

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1499800

It sounds like what you really want is to trigger the text change when the MediaEnded event is fired.

You could do that within your ChangeToSpeech method, although it'll be a little ugly:

public async static Task ChangeToSpeech(string text, MediaElement media)
{
    var synth = new SpeechSynthesizer();
    var voices = SpeechSynthesizer.AllVoices;

    synth.Voice = voices.First(x => x.Gender == VoiceGender.Female);

    SpeechSynthesisStream stream = await synth.SynthesizeTextToStreamAsync(text);

    var tcs = new TaskCompletionSource<int>();
    RoutedEventHandler handler = delegate { tcs.TrySetResult(10); };
    media.MediaEnded += handler;
    try
    {
        media.SetSource(stream, stream.ContentType);
        media.Play();
        // Asynchronously wait for the event to fire
        await tcs.Task;
    }
    finally
    {
        media.MediaEnded -= handler;
    }
}

Upvotes: 7

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