public double Npv(NpvObjectModel model, double discountRate)
{
var cashFlows = model.GetCashFlows();
var npv = cashFlows.Select((c, n) => c / Math.Pow(1 + (discountRate / 100), n)).Sum();
return(Math.Round(npv, 2));
}
public async Task <NpvResultModel> NpvCollectionAsync(NpvObjectModel model)
{
var result = new NpvResultModel();
await Task.Run(() =>
{
var cashFlows = model.CashFlows.Split(',').Select(Double.Parse).ToList();
cashFlows.Insert(0, -model.IntialInvestment);
var discountRate = model.LowerBoundDiscountRate;
while (discountRate <= model.UpperBoundDiscountRate)
{
result.Labels.Add($"{discountRate}%");
result.Values.Add(Npv(model, discountRate));
discountRate = Math.Round(discountRate + model.DiscountRateIncrement, 2);
}
;
});
return(result);
}
// POST api/values
public async Task <IHttpActionResult> Post([FromBody] NpvObjectModel model)
{
var result = await new ComputeHelper().NpvCollectionAsync(model);
return(Ok(result));
}