public void ExecuteCommand(ICommand command)
{
if (command.Execute())
{
_history.Push(command);
}
}
public void Execute()
{
_previousProductsInInvoice = _invoiceService.Products.ToList();
_previousProductsInInventory = _inventoryService.Products.ToList();
_invoiceService.AddProductToInvoice(_product);
_inventoryService.AddProductToDelivery(_product);
_commandHistory.Push(this);
}