private List<BondCalculatorModel> ReadTestInput(string testfile,bool expectYield)
{
List<BondCalculatorModel> inputs = new List<BondCalculatorModel>();
using (StreamReader reader = File.OpenText(testfile))
{
CsvReader csv = new CsvReader(reader);
while (csv.Read())
{
BondCalculatorModel model = new BondCalculatorModel();
model.CouponRate = csv.GetField<decimal>(0);
model.YearsToMaturity = csv.GetField<int>(1);
model.Frequency = csv.GetField<int>(2);
model.FaceValue = csv.GetField<decimal>(3);
if (expectYield)
{
model.PresentValue = csv.GetField<decimal>(4);
model.Yield = csv.GetField<decimal>(5);
}
else
{
model.Yield = csv.GetField<decimal>(4);
model.PresentValue = csv.GetField<decimal>(5);
}
inputs.Add(model);
}
}
return inputs;
}
public BondCalculatorViewModel()
{
//create model object
calculatorModel = new BondCalculatorModel();
//create calculation engine object using Unity container
//we can register other types for this interface in unity and use here e.g. FincadCalculationEngine, BrentEngine
calculationEngine = UnityFactory.Resolve<IBondCalculationEngine>("Default");
//register event from model, will be raised when error state of model properties will change
//will be used to enable/disable calculator button/radio button
calculatorModel.NotifyVM = () => { NotifyPropertyChanged("ReadyForCalculation"); };
//command that binds to Calculate button.
CalculateCommand = new DelegateCommand(param => PriceBond(), (param) => ((ReadyForCalculation) && (!calculationRunning)));
//capture action when user wants to switch from ComputeYield to ComputePV and vice-versa
YieldToggleCommand = new DelegateCommand(param => {
yieldGiven = (bool)param;
StatusText = "";
if (yieldGiven)
{
calculatorModel.Yield = 0.0m;
calculatorModel.PresentValue = 0.0m;
}
}, (param) => true);
PVToggleCommand = new DelegateCommand(param => {
yieldGiven = !(bool)param;
StatusText = "";
if (!yieldGiven)
{
calculatorModel.PresentValue = 0.0m;
calculatorModel.Yield = 0.0m;
}
}, (param) => true);
}