[C#] 上位机开发之报警检测

        /// <summary>
        /// 报警值比较
        /// </summary>
        /// <param name="current">实时值</param>
        /// <param name="set">设定值</param>
        /// <param name="cache">缓存值</param>
        /// <param name="isPositive">上升沿</param>
        /// <returns>1:报警发生;-1报警消除;0 状态不变</returns>
        public static AlarmState Compare(float current, float set, float cache, bool isPositive)
        {
            if (current is float.NaN || cache is float .NaN)//正常情况下,NaN一般是数据不正常.直接状态不变就行了
            {
                Debug.WriteLine($"报警比较方法:输入:{ current},缓存值:{cache}");

                return AlarmState.Keep;
            }
            if (isPositive)
            {
                if (current >= set && cache < set)
                {
                    return  AlarmState.Occurs;//报警发生
                }
                if (current < set && cache >= set)
                {
                    return AlarmState.Elimination;//报警消除
                }
            }
            else
            {
                if (current <= set && cache > set)
                {
                    return AlarmState.Occurs;//报警发生
                }
                if (current > set && cache <= set)
                {
                    return  AlarmState.Elimination;//报警消除
                }
            }
            return  AlarmState.Keep;
        

    alarmState = Common.Compare(_currentValue,
          alarmVariable.HiHiAlarmValue,
          alarmVariable.CacheValue,
          isPositive: true);

if (alarmState != AlarmState.Keep)
{
  AlarmEvent?.Invoke(alarmVariable, new AlarmEventArgs
{
  InsertTime = now,
  AlarmName = alarmVariable.Name,
  alarmInfo = alarmVariable.HiHiAlarmNote,
  CurrentValue = _currentValue.ToString(),
  SetValue = alarmVariable.HiHiAlarmValue.ToString(),
  IsACK = (alarmState == AlarmState.Occurs)
  });
}