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SpeechSynthesizer.SpeakAsync Method (String)

Asynchronously speaks the contents of a string.

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

public Prompt SpeakAsync(
	string textToSpeak


Type: System.String

The text to speak.

Return Value

Type: System.Speech.Synthesis.Prompt
Returns the object that contains the content to speak.

To asynchronously speak a string that contains SSML markup, use the SpeakSsmlAsync method. To synchronously speak the contents of a string, use the Speak method. You can cancel the asynchronous speaking of a prompt with the SpeakAsyncCancel or the SpeakAsyncCancelAll method.

As shown in the following example, the SpeakAsync method provides the simplest means to generate speech output asynchronously.

using System;
using System.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. 

      // Speak a string asynchronously.
      synth.SpeakAsync("What is your favorite color?");

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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