private static decimal GetGrandTotalFrom(ShellViewModel viewModel)
{
if (string.IsNullOrWhiteSpace(viewModel.GrandTotal))
return 0m;
string grandTotalString = viewModel.GrandTotal.Substring(1);
decimal grandTotalAmount;
if (!decimal.TryParse(grandTotalString, out grandTotalAmount))
return 0m;
return grandTotalAmount;
}
private static ShellViewModel CreateViewModelWithBooks(int[] books)
{
var vm = new ShellViewModel();
foreach (var book in books)
{
if (book == 1)
vm.Book1Quantity++;
if (book == 2)
vm.Book2Quantity++;
if (book == 3)
vm.Book3Quantity++;
if (book == 4)
vm.Book4Quantity++;
if (book == 5)
vm.Book5Quantity++;
}
vm.Calculate();
return vm;
}