public IEnumerable <TimeSpan> GetPeriods(Func <CarSignalInfo, bool> filter, DateTime historyTime)
{
DateTime?lastRecordTime = null;
foreach (var carSensorInfo in CarSignalSet.TakeWhile(x => x.RecordTime >= historyTime))
{
var result = filter(carSensorInfo);
if (result)
{
if (!lastRecordTime.HasValue)
{
lastRecordTime = DateTime.Now;
}
continue;
}
if (lastRecordTime.HasValue)
{
var period = (lastRecordTime.Value - carSensorInfo.RecordTime);
lastRecordTime = null;
yield return(period);
}
}
}
public bool GetSafetyBeltChanged(int minCount)
{
if (CarSignalSet.Count <= 1)
{
return(false);
}
var currentSafetyBelt = CarSignalSet.Current.Sensor.SafetyBelt;
var currentCount = CarSignalSet.TakeWhile(x => x.Sensor.SafetyBelt == currentSafetyBelt).Count();
if (currentCount < minCount)
{
return(false);
}
var previousCount = CarSignalSet.Skip(currentCount).TakeWhile(x => x.Sensor.SafetyBelt == !currentSafetyBelt).Count();
return(previousCount >= minCount);
}