public void RemoveLineItem(PurchaseOrderLine line)
{
if (!_lineItems.Contains(line))
{
throw new PurchaseOrderTrackerException($"Line item is not part of this purchase order: {line}");
}
_lineItems.Remove(line);
}
public void AddLineItem(PurchaseOrderLine line)
{
if (!ProductIsFromSameSupplier(line.Product))
{
throw new PurchaseOrderTrackerException(
$"Line item product must be from the same supplier: {line.Product}");
}
_lineItems.Add(line);
}