SpeechSynthesizer 类
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//绑定时间
speech.SpeakProgress += new EventHandler<SpeakProgressEventArgs>(speech_SpeakProgress);
//选中读的位置
private void speech_SpeakProgress(object sender, SpeakProgressEventArgs e)
{
this.richTextBox1.Select(e.CharacterPosition, e.CharacterCount);
}
