private static Product GetProductA() { Sale sale = new Sale(); return(sale?.Product); //null条件演算子 }
private static Product GetProduct() { Sale sale = new Sale(); return(sale?.Product); }
private static Product GetProductA() { Sale sale = new Sale(); return(sale?.Product); //null条件演算子 }
private static Product GetProduct() { Sale sale = new Sale(); return(sale?.Product); }