private void OnPropertyChanged(object sender, PropertyChangedEventArgs e)
{
TaxRateViewModel trvm = sender as TaxRateViewModel;
if (trvm != null)
{
ReCalculateTaxes(trvm);
}
}
private TaxRateViewModel FindApplicableTaxRate(decimal value)
{
TaxRateViewModel result = null;
foreach (var taxBracket in TaxSchedule)
{
if (value > taxBracket.RangeStart && value <= taxBracket.RangeEnd)
{
result = taxBracket;
break;
}
}
if (result == null)
{
throw new InvalidOperationException("Could not find applicable tax bracket");
}
return(result);
}
private void ReCalculateTaxes(TaxRateViewModel updatedRate)
{
try
{
List <TaxReturnViewModel> affected = new List <TaxReturnViewModel>();
foreach (var item in TaxReturns)
{
TaxRateViewModel newRate = null;
try
{
newRate = FindApplicableTaxRate(item.PreTaxEarnings);
}
catch (InvalidOperationException)
{
item.TaxLiability = decimal.Zero;
item.MarginalTaxRate = 0;
}
if (newRate == updatedRate)
{
affected.Add(item);
}
}
//var affected = from e in Earnings
// where FindApplicableTaxRate(e) == updatedRate
// let taxReturn = from r in TaxReturns
// where r.PreTaxEarnings == e
// select r
// select taxReturn;
foreach (var item in affected)
{
var newTax = CalculateTaxLiability(item.PreTaxEarnings, updatedRate);
item.TaxLiability = newTax;
item.MarginalTaxRate = updatedRate.MarginalTaxRate;
}
}
catch (InvalidOperationException ex)
{
Console.Error.WriteLine(ex.Message);
}
}
public decimal CalculateTaxLiability(decimal pretaxEarning, TaxRateViewModel taxBracket)
{
return(taxBracket.BaseTaxAmount + (decimal)taxBracket.MarginalTaxRate * (pretaxEarning - taxBracket.MarginalRateFloor));
}
private void ReCalculateTaxes(TaxRateViewModel updatedRate)
{
try
{
List<TaxReturnViewModel> affected = new List<TaxReturnViewModel>();
foreach (var item in TaxReturns)
{
TaxRateViewModel newRate = null;
try
{
newRate = FindApplicableTaxRate(item.PreTaxEarnings);
}
catch (InvalidOperationException)
{
item.TaxLiability = decimal.Zero;
item.MarginalTaxRate = 0;
}
if (newRate == updatedRate)
{
affected.Add(item);
}
}
//var affected = from e in Earnings
// where FindApplicableTaxRate(e) == updatedRate
// let taxReturn = from r in TaxReturns
// where r.PreTaxEarnings == e
// select r
// select taxReturn;
foreach (var item in affected)
{
var newTax = CalculateTaxLiability(item.PreTaxEarnings, updatedRate);
item.TaxLiability = newTax;
item.MarginalTaxRate = updatedRate.MarginalTaxRate;
}
}
catch (InvalidOperationException ex)
{
Console.Error.WriteLine(ex.Message);
}
}
public decimal CalculateTaxLiability(decimal pretaxEarning, TaxRateViewModel taxBracket)
{
return taxBracket.BaseTaxAmount + (decimal)taxBracket.MarginalTaxRate * (pretaxEarning - taxBracket.MarginalRateFloor);
}