C# 文字转声音

        private SpVoice voice; 
        private void button1_Click(object sender, EventArgs e)
        {
             voice = new SpVoice();
            voice.Rate = 0;
            voice.Volume = 100;
            voice.Speak(textBox1.Text, SpeechVoiceSpeakFlags.SVSFlagsAsync);

        }

        private void button2_Click(object sender, EventArgs e)
        {
            voice.Pause();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            voice.Resume();
        }