//声明一个委托
private delegate void SetTimerLogicCallback();

//声明一个定时器的类
private System.Threading.Timer threadTimer;

//执行委托的方法，ShowMemorandumInfo是查询数据库的方法
private void ThreadMethod(object obj)
    {
      SetTimerLogicCallback timerLogic = new SetTimerLogicCallback(ShowMemorandumInfo);
      this.Invoke(timerLogic);
    }


 /// <summary>
    /// 定时器设置，这个方法或者这段代码可以写在窗体加载的时候
    /// </summary>
    private void TimerSet()
    {
       threadTimer = new System.Threading.Timer(new System.Threading.TimerCallback(ThreadMethod), null, 0, 1000);
    }

/// <summary>
    /// 微软语音识别
    /// </summary>
    /// <param name="content">提示内容</param>
    public static void SpeakAsync(string content)
    {
      try
      {
        if (synth != null)
          synth.Dispose();
        synth = new System.Speech.Synthesis.SpeechSynthesizer();
        synth.SpeakAsyncCancelAll();
        synth.SpeakAsync(content);
      }
      catch (Exception ex)
      {
        throw ex;
      }
    }


    /// <summary>
    /// 百度语音合成(文档网站:http://yuyin.baidu.com/docs/tts/197)
    /// </summary>
    private void BaiduTts(string audioText)
    {
      _ttsClient = new Baidu.Aip.Speech.Tts("API_KEY", "SECRET_KEY ");
      // 可选参数
      var option = new Dictionary<string, object>()
        {
          {"spd", 5}, // 语速
          {"vol", 7}, // 音量
          {"per", 4} // 发音人，4：情感度丫丫童声
        };
      var result = _ttsClient.Synthesis(audioText, option);
      if (result.ErrorCode == 0)
      {
        string fileName = Application.StartupPath + "\\" + Guid.NewGuid().ToString() + ".mp3";
        System.IO.File.WriteAllBytes(fileName, result.Data);
        axWindowsMediaPlayer1.URL = fileName;
        axWindowsMediaPlayer1.Ctlcontrols.play();
        System.IO.File.Delete(fileName);
      }
      else
      {
        Utils.LogMessage("百度语音合成异常", result.ErrorMsg);
      }
    }