C＃执行特定代码

Question

我想知道在运行程序时是否有可能由用户执行特定的代码（程序是命令行界面）。

程序按顺序执行所有操作，但这不是我想要的。

以下是程序运行方式及其背后代码的两个屏幕截图。

[]

        // Read all the bookings between dates:
        Console.WriteLine("Input start date in the format yyyy-mm-dd");
        DateTime bookingStartDate = DateTime.Parse(Console.ReadLine());
        Console.WriteLine("Input end date in the format yyyy-mm-dd");
        DateTime bookingEndDate = DateTime.Parse(Console.ReadLine());
        DbBookings bookings = new DbBookings(bookingStartDate, bookingEndDate);
        foreach (DbBooking booking in bookings.Bookings)
        {
            Console.WriteLine("booking start date = " + booking.startDate);
            Console.WriteLine("booking end date = " + booking.endDate);
            Console.WriteLine("booking room No = " + booking.roomNo);
            Console.WriteLine("booking guest = " + booking.guestName);
            Console.WriteLine("booking guest phone No = " + booking.guestPhone);
            Console.WriteLine("booking cost = " + booking.cost);
        }


        //Create a new booking
        Console.WriteLine("Bed and breakfast create new booking");

        Console.WriteLine("Input start date in the format yyyy-mm-dd");
        DateTime startDate = DateTime.Parse(Console.ReadLine());
        Console.WriteLine("Input end date in the format yyyy-mm-dd");
        DateTime endDate = DateTime.Parse(Console.ReadLine());
        Console.WriteLine("What room?");
        int room = int.Parse(Console.ReadLine());
        Console.WriteLine("Customer Name");
        string name = Console.ReadLine();
        Console.WriteLine("Customer phone number");
        string phone = Console.ReadLine();
        double cost = (endDate.ToOADate() - startDate.ToOADate()) * 29;

        DbBooking newBooking = new DbBooking(
            startDate,
            startDate,
            room,
            name,
            phone,
            cost
            );
        Console.ReadLine();

我希望程序要做的是提出2个问题，“你想阅读预订吗？”和“你想要添加新预订”，你可以通过输入'1'或'2'来回答问题

Answer 1

如果您希望基于不同的用户输入值使其行为不同，则需要在代码中引入逻辑。 This link将解释if，else if和else关键字的工作原理。此外，如果您想进一步扩展分支知识，可以使用switch statements。

static void Main(string[] args) {
    Console.WriteLine("Do you want to read the bookings?");
    string response = Console.ReadLine();
    if (response == "1")
        ReadBookings();
    else {
        Console.WriteLine("Do you want to create a booking?");
        response = Console.ReadLine();
        if (response == "1")
            CreateBooking();
    }

    Console.WriteLine("Press any key to exit.");
    Console.ReadKey();
}

static void ReadBookings() {
    DateTime startDate, endDate;

    Console.WriteLine("Input start date in the format yyyy-mm-dd");
    startDate = DateTime.Parse(Console.ReadLine());

    Console.WriteLine("Input end date in the format yyyy-mm-dd");
    endDate = DateTime.Parse(Console.ReadLine());

    DbBookings bookings = new DbBookings(bookingStartDate, bookingEndDate);
    foreach (DbBooking booking in bookings.Bookings)
        Console.WriteLine($"booking start date: {booking.startDate}\nbooking end date: {booking.endDate}\nbooking room No: {booking.roomNo}\nbooking guest: {booking.guestName}\nbooking guest phone No: {booking.guestPhone}\nbooking cost: {booking.cost});
}

static void CreateBooking() {
    DateTime startDate, endDate;
    string name, phone;
    int room;
    double cost;

    Console.WriteLine("Bed and breakfast create new booking");
    Console.WriteLine("Input start date in the format yyyy-mm-dd");
    startDate = DateTime.Parse(Console.ReadLine());

    Console.WriteLine("Input end date in the format yyyy-mm-dd");
    endDate = DateTime.Parse(Console.ReadLine());

    Console.WriteLine("What room?");
    room = int.Parse(Console.ReadLine());

    Console.WriteLine("Customer Name");
    name = Console.ReadLine();

    Console.WriteLine("Customer phone number");
    phone = Console.ReadLine();
    cost = (endDate.ToOADate() - startDate.ToOADate()) * 29;

    DbBooking newBooking = new DbBooking(startDate, endDate, room, name, phone, cost);
}