/// <summary>
 /// 定时器事件
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void Timer1_Tick(object sender, EventArgs e)
 {
     this.UpdateQueueValue();
     foreach (var series in this.chart1.Series)
     {
         series.Points.Clear();
     }
     for (int i = 0; i < _dataQueue.Count; i++)
     {
         WheelSurfaceAngles group = _dataQueue.ElementAt(i);
         this.chart1.Series["WheelLeft"].Points.AddXY(i, group.WheelLeftSurfaceAngle);
         this.chart1.Series["WheelRight"].Points.AddXY(i, group.WheelRightSurfaceAngle);
         this.chart1.Series["YawAngle"].Points.AddXY(i, group.YawAngle);
     }
 }
        //更新队列中的值
        private void UpdateQueueValue()
        {
            if (this._dataQueue.Count > _maxCount)
            {
                //先出列
                for (int i = 0; i < _num; i++)
                {
                    this._dataQueue.Dequeue();
                }
            }
            string    sqlString = string.Format("select t.wheel_left_surface_angle, t.wheel_right_surface_angle, t.yaw_plc from t_rcms_machineposture_time t where t.machine_name = '{0}'", _machineName);
            DataTable table     = this.provider.Query(sqlString);

            if (table == null || table.Rows.Count == 0)
            {
                return;
            }
            this._dataQueue.Enqueue(WheelSurfaceAngles.GetInstance(table.Rows[0]));
        }