How to Stop SpeakAsync if another message were about to speak out?

Question

I'm trying to create a web page with speech recognition using c# as my code behind. Please help me because I want to know how may I stop a SpeakAsync to deliver the full message when another message started to speak.

pseudocode like this

 protected void Button1_Click(object sender, EventArgs e)
    {
        ss.SpeakAsync(CurrentStop); // it means if there is a current message it should stop before delivering the next line
        ss.SpeakAsync("Phrase and Sentence");
    }

    protected void Button2_Click(object sender, EventArgs e)
    {
        ss.SpeakAsync(CurrentStop);
        ss.SpeakAsync("Phrase is a group of words without a complete thought.");
    }

please help me. It's my first time to use c# as well as system.speech

Answer 1

Use the GetCurrentlySpokenPrompt and SpeakAsyncCancel methods to cancel the current prompt:

var current = ss.GetCurrentlySpokenPrompt();

if (current != null)
    ss.SpeakAsyncCancel(current);

---

Full Example

var ss = new SpeechSynthesizer();

ss.SpeakAsync("This is a test.");

Thread.Sleep(300);

var current = ss.GetCurrentlySpokenPrompt();

if (current != null)
    ss.SpeakAsyncCancel(current);

ss.SpeakAsync("Goodbye.");