public List <NPVSet> CalculateSetOfNPV(CalculateSetOfNPVRequest request)
{
var totalDiscountInterestRateRequest = new GetTotalDiscountRateIncrementRowsRequest
{
Increment = request.Increment
,
UpperBoundDiscountRate = request.UpperBoundDiscountRate
,
LowerBoundDiscountRate = request.LowerBoundDiscountRate
};
ValidateInputs(totalDiscountInterestRateRequest, request);
var listOfInterests = BuildConcurrentCollectionOfInterest(totalDiscountInterestRateRequest);
var dictionary = new ConcurrentDictionary <double, NPVSet>();
Parallel.ForEach(listOfInterests, (interest) =>
{
var discountRate = interest / 100;
var npv = CalculateIndividualNPV(new CalculateIndividualNPVRequest {
CashFlows = request.CashFlow
, InitialValue = request.InitialCost
, Interest = discountRate
});
var npvSet = new NPVSet
{
CashFlowSummary = string.Join(", ", request.CashFlow.ToArray())
,
DiscountRate = interest
,
InitialCost = Math.Abs(request.InitialCost)
,
NPV = Math.Round(npv, 2)
};
dictionary.AddOrUpdate(interest, npvSet, (dr, set) => npvSet);
});
var listOfKeys = dictionary.Keys.ToList();
listOfKeys.Sort();
var finalList = new List <NPVSet>();
listOfKeys.ForEach(k =>
{
finalList.Add(dictionary[k]);
});
return(finalList);
}
private ConcurrentBag <double> BuildConcurrentCollectionOfInterest(GetTotalDiscountRateIncrementRowsRequest request)
{
var retValue = new ConcurrentBag <double>();
var lowerLimitDiscountRate = request.LowerBoundDiscountRate;
while (lowerLimitDiscountRate <= request.UpperBoundDiscountRate)
{
retValue.Add(lowerLimitDiscountRate);
lowerLimitDiscountRate += request.Increment;
}
return(retValue);
}
