static void TestSave() { OrderForm order1 = new OrderForm("冰激凌", 10.0, 1); OrderForm order2 = new OrderForm("苹果", 1.0, 2); OrderForm order3 = new OrderForm("香蕉", 0.8, 5); OrderForm order4 = new OrderForm("香蕉", 0.8, 3); OrderForm order5 = new OrderForm("冰激凌", 10.0, 3); AccountBook book = new AccountBook(); book.AddOrder(order1); book.AddOrder(order2); book.AddOrder(order3); book.AddOrder(order4); book.AddOrder(order5); ShowOrder(book, "冰激凌"); ShowOrder(book, "香蕉"); ShowOrder(book, "芝麻"); //book.SaveToFile(); book.SaveToFile_Stream(); }