Chinook.Model.Invoice.FixupInvoiceLines C# (CSharp) Метод

        private void FixupInvoiceLines(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.NewItems != null)
            {
                foreach (InvoiceLine item in e.NewItems)
                {
                    item.Invoice = this;
                }
            }
    
            if (e.OldItems != null)
            {
                foreach (InvoiceLine item in e.OldItems)
                {
                    if (ReferenceEquals(item.Invoice, this))
                    {
                        item.Invoice = null;
                    }
                }
            }
        }