我的问题令我非常困惑。 在我的班子的构造中,我创建了一个有两种阵列(扼杀和翻一番)的SeatManager.c。 btnReserveCancel_Click 我试图用数据填补这两个阵列。 但是,当我后来称之为《最新准则》时,又创建了另一个“SeatManager.cs”(我的老师补充说,在我需要帮助时,该法典的行文是另一回事),当出现我刚刚在两个阵列中填满的所有数据时,就会失去! 令人信服的部分是,如果我删除了在《最新准则》中创建新案例的行文,则编辑在我说有些错了。

Why does UpdateGUI() need a new instance of SeatManager.cs when btnReserveCancel_Click doesn t? Why does UpdateGUI() need a new instance of SeatManager.cs when there is one available in the instance variables?

    private double revenue = 0.0;
    private const int totalNumOfSeats = 10;
    private int numOfReservedSeats = 0; //Increases every time a new reservation is made
    const double minLimit = 10;
    const double maxLimit = 50;
    private SeatManager seatMngr;

    public MainForm()
    {
        InitializeComponent();
        InitializeGUI();
        seatMngr = new SeatManager(totalNumOfSeats);//skapar en instans av klassen SeatManager
        UpdateGUI();
    }



    private void btnReserveCancel_Click(object sender, EventArgs e)
    {
        if (rbtnReserved.Checked == true)//Om radiobutton RESERVE är iklickad
        {
            string customerName = string.Empty;
            double seatPrice = 0.0;

            int selection = listBox1.SelectedIndex;
            if (selection == -1)
            {
                MessageBox.Show(string.Format("You must select which seat you want to reserve!"), "Select a seat.", MessageBoxButtons.OK, MessageBoxIcon.None);

            }
            else
            {
                string getSeatNumber = listBox1.SelectedItem.ToString();//Tar första bokstaven i den markerade strängen i listboxen och gör om till index.
                int seatNumber = int.Parse(getSeatNumber.Substring(0, 1));

                bool inputOk = ReadAndValidateInput(out customerName, out seatPrice);
                bool validSeats = CheckVacantSeats();

                if (inputOk && validSeats)
                {
                    if (seatMngr.ReserveSeat(customerName, seatPrice, seatNumber) != true)
                    {
                        var result = MessageBox.Show(string.Format("Do you wish to overwrite reservation? "), "Seat already registered", MessageBoxButtons.YesNo, MessageBoxIcon.None);
                        if (result == DialogResult.Yes)
                        {
                            double amount = seatMngr.GetPaidPrice(seatNumber);
                            MoneyBackWhenCancelOrOverwrite(amount);
                            seatMngr.ReserveSeatOverwrite(customerName, seatPrice, seatNumber);
                            revenue += seatPrice;
                        }
                    }
                    else
                    {
                        seatMngr.ReserveSeat(customerName, seatPrice, seatNumber);
                        numOfReservedSeats++;
                        revenue += seatPrice;
                        if (seatMngr.ReserveSeat(customerName, seatPrice, seatNumber) == true)
                        {
                            MessageBox.Show(string.Format("Det funkade "), "Sfgdfg", MessageBoxButtons.OK, MessageBoxIcon.None);
                        }
                    }
                }
            }
        }
        else if (rbtnCancel.Checked == true)//Om radiobutton CANCEL är iklickad.
        {
            string getSeatNumber = listBox1.SelectedItem.ToString();//Tar första bokstaven i den markerade strängen i listboxen och gör om till index.
            int seatNumber = int.Parse(getSeatNumber.Substring(0, 1));

            var result = MessageBox.Show(string.Format("Do you wish to cancel reservation? "), "Seat registered", MessageBoxButtons.YesNo, MessageBoxIcon.None);
            if (result == DialogResult.Yes)
            {
                double amount = seatMngr.GetPaidPrice(seatNumber);
                MoneyBackWhenCancelOrOverwrite(amount);
                seatMngr.CancelSeat(seatNumber);
                numOfReservedSeats--;
            }
            else { }
        }
        UpdateGUI();
    }



    private void UpdateGUI()
    {
        labelVacant.Text = (totalNumOfSeats - numOfReservedSeats).ToString();//Visar antal ledig platser.
        labelReserved.Text = numOfReservedSeats.ToString();//Visar antal reserverade platser.
        labelRevenue.Text = revenue.ToString();//Visar intäkter.
        labelSeats.Text = totalNumOfSeats.ToString();//Visar totalt antal platser. Värdet är konstant så det kan inte ändras.
        DisplayOptions choice = (DisplayOptions)comboBox1.SelectedIndex;

        string[] strSeatInfoStrings;


        //seatMngr = new SeatManager(totalNumOfSeats);

        int display = seatMngr.GetSeatInfoStrings(choice, out strSeatInfoStrings);
        listBox1.Items.Clear();
        if (strSeatInfoStrings == null)
        {
            listBox1.Items.Add("No seats where found");
        }
        else
        {
            listBox1.Items.AddRange(strSeatInfoStrings);
        }
    }