private void OnAddNewExpenseExecute(ExpenseBucket expense)
{
Dirty = true;
var newExpense = Expenses.AddNew();
Debug.Assert(newExpense != null);
newExpense.Amount = 0;
// New buckets must be created because the one passed in, is a single command parameter instance to be used as a type indicator only.
// If it was used, the same instance would overwritten each time an expense is created.
if (expense is SpentMonthlyExpenseBucket)
{
newExpense.Bucket = new SpentMonthlyExpenseBucket(string.Empty, string.Empty);
}
else if (expense is SavedUpForExpenseBucket)
{
newExpense.Bucket = new SavedUpForExpenseBucket(string.Empty, string.Empty);
}
else if (expense is SavingsCommitmentBucket)
{
newExpense.Bucket = new SavingsCommitmentBucket(string.Empty, string.Empty);
}
else
{
throw new InvalidCastException("Invalid type passed to Add New Expense: " + expense);
}
Expenses.RaiseListChangedEvents = true;
newExpense.PropertyChanged += OnExpenseAmountPropertyChanged;
}