//1.Async="true"

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//2.SpeechSynthesizer speak = new SpeechSynthesizer();

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//同步朗讀

//3.1 speak.Speak(txt.Text.Trim());

//speak.Dispose();? //釋放之前的資源

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//異步朗讀

//3.2 speak.SpeakAsync(txt.Text.Trim());

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//speak.Volume = 100;? //設置朗讀音量 [范圍 0 ~ 100]

//speak.Rate = 0;????? //設置朗讀頻率 [范圍? -10 ~ 10]

//speak.SelectVoice("Microsoft Lili");? //SpeakChina

//speak.SelectVoice("Microsoft Anna");? //SpeakEnglish

//SelectVoiceByHints(VoiceGender.Male, VoiceAge.Child, 2, System.Globalization.CultureInfo.CurrentCulture);

//speak.SpeakAsyncCancelAll();? //取消朗讀

//speak.SetOutputToWaveFile("c:\\message.wav");

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//語音合成

//4.PromptBuilder pb = new PromptBuilder();

//speak.SelectVoice("Microsoft Lili");

//pb.ClearContent();

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//.Net 4.0 的實現方式：

/*

????Type type = Type.GetTypeFromProgID("SAPI.SpVoice");

????dynamic spVoice = Activator.CreateInstance(type);

????spVoice.Speak("你好,歡迎使用 CSharp 4.0！");

????*/

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//5.語音完成

/*

????speak.SpeakCompleted += new EventHandler<SpeakCompletedEventArgs>(speak_SpeakCompleted);

????void speak_SpeakCompleted(object sender, SpeakCompletedEventArgs e)

????{

????txt.Text = "完成";

????}

????*/

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//SPEAK 開始

/*var reader = new SpeechSynthesizer();

reader.SpeakAsync(txt.Text); */

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//event handler

//reader.SpeakCompleted += new EventHandler<SpeakCompletedEventArgs>(reader_SpeakCompleted);

//或

//sp.SpeakCompleted += (s, arg) => txt.Text = "true";

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//PAUSE 暫停

/*if (reader.State == SynthesizerState.Speaking)

{

????reader.Pause();

????btn_pause.Text = "繼續";

}*/

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//RESUME 繼續

/*if (reader.State == SynthesizerState.Paused)

{

????reader.Resume();

????btn_pause.Text = "暫停";

}*/

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//STOP 停止

//reader.Dispose();