public WPFViewModel(RealFileProvider realFileProvider)
{
History = new ObservableCollection <IncomeTaxCalFinder>();
INotifyPropertyChanged notify;
this.fileProvider = new RealFileProvider();
IncomeCalculator = new IncomeTaxCalFinder();
IncomeCalculator.Income = 75000;
States = IncomeCalculator.taxRates;
CalculateCommand = new DelegateCommand(() =>
{
if (IncomeCalculator.Income <= 0)
{
MessageBox.Show("Income must be greater the zero.");
return;
}
IncomeCalculator.State = SelectedState;
if (IncomeCalculator.State == null)
{
MessageBox.Show("A state must be selected");
return;
}
IncomeCalculator.taxableIncome();
History.Add(IncomeCalculator);
ExportToExcel.RaiseCanExecuteChanged();
IncomeCalculator = IncomeCalculator.Clone() as IncomeTaxCalFinder;
RaisePropertyChanged(nameof(IncomeCalculator));
});
}
public void TestTaxableIncome()
{
var incomeTax = new IncomeTaxCalFinder
{
State = "AL",
Income = 45000
};
decimal expected = 43200;
decimal actual = incomeTax.taxableIncome();
Assert.AreEqual(expected, actual);
// If income is less then zero then this method will return zero
try
{
var badIncomeTax = new IncomeTaxCalFinder
{
State = "AL",
Income = -45000
};
Assert.Fail("Negative income should throw an exception.");
}
catch (ArgumentOutOfRangeException ar)
{
Assert.Pass("Negative income throws an exception.");
}
}
private void getNewIncome_Click(object sender, EventArgs e)
{
IncomeTaxCalFinder calc = new IncomeTaxCalFinder();
calc.Income = decimal.Parse(txtIncomeBox.Text);
if (calc.Income <= 0)
{
MessageBox.Show("Income must be greater then zero.");
return;
}
calc.State = combState.Text;
if (combState.SelectedIndex == -1)
{
MessageBox.Show("Please select a state");
return;
}
txtNewIncome.Text = calc.taxableIncome().ToString("c");
CalcHistory.Count();
CalcHistory.Add(calc);
}