SpeechSynthesizer.SpeakSsmlAsync Method

Asynchronously speaks a String that contains SSML markup.

Namespace:  Microsoft.Speech.Synthesis
Assembly:  Microsoft.Speech (in Microsoft.Speech.dll)

public Prompt SpeakSsmlAsync(
	string textToSpeak


Type: System.String
The SMML markup to speak.

The contents of the textToSpeak parameter must include a speak element and must conform to the Speech Synthesis Markup Language (SSML) Version 1.0. For more information, see Speech Synthesis Markup Language Reference (Microsoft.Speech).

To synchronously speak a string that contains SSML markup, use the SpeakSsml(String) method. You can use SpeakAsync(String) to initiate the asynchronous speaking of a string that does not contain SSML markup.

During a call to this method, the SpeechSynthesizer can raise the following events:

  • StateChanged. Raised when the speaking state of the synthesizer changes.

  • SpeakStarted. Raised when the synthesizer begins generating speech.

  • SpeakProgress. Raised each time the synthesizer completes speaking a word.

  • BookmarkReached. Raised when the synthesizer encounters a bookmark in a prompt.

  • VoiceChange. Raised when the speaking voice for the synthesizer changes.

  • SpeakCompleted. Raised when the synthesizer finishes processing a SpeakSsmlAsync(String) operation.

using System;
using Microsoft.Speech.Synthesis;

namespace SampleSynthesis
  class Program
    static void Main(string[] args)

      // Initialize a new instance of the SpeechSynthesizer.
      SpeechSynthesizer synth = new SpeechSynthesizer();

      // Configure the audio output. 

      // Register for the SpeakCompleted event.
      synth.SpeakCompleted += new EventHandler<SpeakCompletedEventArgs>(synth_SpeakCompleted);

      // Build an SSML prompt in a string.
      string str = "<speak version=\"1.0\"";
      str += " xmlns=\"http://www.w3.org/2001/10/synthesis\"";
      str += " xml:lang=\"en-US\">";
      str += "<say-as type=\"date:mdy\"> 1/29/2009 </say-as>";
      str += "</speak>";

      // Speak the contents of the prompt asynchronously.

      Console.WriteLine("Press any key to exit...");

    // Handle the SpeakCompleted event.
    static void synth_SpeakCompleted(object sender, SpeakCompletedEventArgs e)

      // Create a SoundPlayer instance to play the output audio file.
      System.Media.SoundPlayer m_SoundPlayer =
        new System.Media.SoundPlayer(@"C:\Test\Date.wav");

      //  Play the output file.