public void Validate()
{
if (string.IsNullOrWhiteSpace(OrderNumber))
{
throw new ValidationErrorException(nameof(OrderNumber));
}
if (TotalValue < 0)
{
throw new ValidationErrorException(nameof(TotalValue));
}
if (Customer == null)
{
throw new ValidationErrorException(nameof(Customer));
}
Customer.Validate();
if (ShippingAddress == null)
{
throw new ValidationErrorException(nameof(ShippingAddress));
}
ShippingAddress.Validate();
if (OrderLines == null || !OrderLines.Any())
{
throw new ValidationErrorException(nameof(OrderLines));
}
OrderLines.ForEach(o => o.Validate());
}
private void CalculateSubtotalPrice()
{
OrderLines.ForEach(line => line.CalculatePrice());
var subtotal = OrderLines
.Aggregate(0.0, (i, line) => i + line.Price);
SubtotalPrice = Math.Round(subtotal, 2);
}