How to use operators(if else) in lambda expression

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CurrentFinancialMovementData movementData = keys.OrderByDescending(s => s.LatestReserveDate ?? s.LatestRecoveryReserveDate).ThenByDescending(x => x.ReserveDaySequence).First();

CurrentFinancialMovementData movementDataReserve = keys.Where(s => s.AmountType == (short)StaticValues.AmountType.Reserve).OrderByDescending(a => a.LatestReserveDate).ThenByDescending(x => x.ReserveDaySequence).FirstOrDefault();

CurrentFinancialMovementData movementDataRecoveryReserve = keys.Where(s => s.AmountType == (short)StaticValues.AmountType.RecoveryReserve).OrderByDescending(a => a.LatestRecoveryReserveDate).ThenByDescending(x => x.ReserveDaySequence).FirstOrDefault();

I want to check if my movementData AmountType.Reserve then it must take LatestReserveDate and if my movementData is AmountType.RecoveryReserve than it should take LatestRecoveryReserveDate. I want to handle this situation in movementData. Can anyone help me in this ?

What I have tried:

I tried:
if (keys.Any(s => s.AmountType == (short)StaticValues.AmountType.Reserve))
{ CurrentFinancialMovementData movementData = keys.OrderByDescending(s => s.LatestReserveDate).ThenByDescending(x => x.ReserveDaySequence).First();
}
else if (keys.Any(s => s.AmountType == (short)StaticValues.AmountType.RecoveryReserve))
{ CurrentFinancialMovementData movementData = keys.OrderByDescending(s => s.LatestRecoveryReserveDate).ThenByDescending(x => x.ReserveDaySequence).First();
}

Posted 28-Feb-19 20:31pm

Member 9956700

Updated 1-Mar-19 9:29am

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#realJSOP · Answer 1 · 2019-03-01T09:30:00

I would do it this way:

C#

CurrentFinancialMovementData movementData = null;
{
    CurrentFinancialMovementData movement1 = keys.OrderByDescending(s => s.LatestReserveDate)
                                                 .ThenByDescending(x => x.ReserveDaySequence)
                                                 .FirstOrDefault(x=>x.AmountType == StaticValues.AmountType.Reserve);
    CurrentFinancialMovementData movement2 = keys.OrderByDescending(s => s.LatestRecoveryReserveDate)
                                                 .ThenByDescending(x => x.ReserveDaySequence)
                                                 .FirstOrDefault(x=>x.AmountType == StaticValues.AmountType.RecoveryReserve);
    movementData = (movement == null) ? movement2 : movement;
}

// caveat - there's still a chance that movementData could be null, but it's 
// handled gracefully in the process of determining that fact, and what you 
// do with that info is up to you.