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#1 donderma  Icon User is offline

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Help me with an error problem please

Posted 28 September 2011 - 03:12 PM

I'm about to go crazy. Please copy and paste my code in your visual studio and try to see my fault because I can not solve it!

My problem pointing continuously at the code if (m_nameList [index] == null) in public bool reserved seat (String name, double price, int index) method, in the seat the manager class as soon as i try to put in a value in the interface. That is why I copy all the classes to you here and hope for help. Thanks
Program class
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace Assignment4
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new MainForm());
        }
    }
}


MainForm class

 

using System;
using System.Windows.Forms;

namespace Assignment4
{
    public partial class MainForm : Form
    {

        private const int m_numOfSeats = 60;

        private SeatManager m_seatMngr;



        public MainForm()
        {
            InitializeComponent();

            m_seatMngr = new SeatManager(m_numOfSeats);

            InitializeGUI();
        }


        private void InitializeGUI()
        {

            cmbDisplayOption.Items.Add("All Seats");
            cmbDisplayOption.Items.Add("Vacant Seat");
            cmbDisplayOption.Items.Add("Reserved Seat");

            cmbDisplayOption.SelectedIndex = 0;
            UpdateGUI();


            rbtnReserve.Checked = true;
            lstReservations.Items.Clear();
            txtName.Text = string.Empty;


        }
        private bool CheckSelectedIndex()
        {
            for (int i = 0; i < lstReservations.Items.Count; i++)
                lstReservations.SelectedIndex = i;


            if (lstReservations.SelectedIndex < 0)
            {
                MessageBox.Show("Item must be selected");
                lstReservations.SelectedIndex = -1;
                return false;
            }
            else
            {
                return true;
            }
        }
        private bool ReadAndValidateName(out string name)
        {
            name = txtName.Text;

            if (string.IsNullOrEmpty(name))
            {
                txtName.Focus();
                MessageBox.Show("There is no name value");
               
                return false;
            }
            else
            {
                return true;
            }
        }
        private bool ReadAndValidatePrice(out double price)
        {
            int minValue = 0;
            const int maxValue = 1000;

            price = Double.Parse(txtPrice.Text);

            if(price < minValue)
            {
                MessageBox.Show("The value in the price box is under 0");
                txtPrice.Focus();
                return false;
            }
            else if (price > maxValue)
            {
                MessageBox.Show("The value in the price box is over max limit");
                txtPrice.Focus();
                return false;
            }

            else
                return true;
        }
        private bool ReadAndValidateInput(out string name, out double price)
        {
            

            ReadAndValidateName(out name);
            ReadAndValidatePrice(out price);

            //name = txtName.Text;
            //price = +Double.Parse(txtPrice.Text);

            if (ReadAndValidateName(out name) && ReadAndValidatePrice(out price))
            {
                ReadAndValidateName(out name);
                ReadAndValidatePrice(out price);
                return true;
            }
            else 
                return false;

        }
        private void ReserveOrCancelSeat(SeatManager.DisplayOptions choice)
        {
            if (CheckSelectedIndex() == false)
            {
                MessageBox.Show("a seat must be selected", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
           if (rbtnReserve.Checked == true)
            {
                // Validate data
                string name = null;
                double price = 0.0;
                if (ReadAndValidateInput(out name, out price) == true)
                {
                    // Data is ok, reserve seat
                    if (!m_seatMngr.ReserveSeat(name, price, lstReservations.SelectedIndex))
                    {
                        lstReservations.Items.Add(!m_seatMngr.ReserveSeat(name, price, lstReservations.SelectedIndex));
                        // The seat was already reserved, ask user if we should continue with reservation
                        if (MessageBox.Show("The seat is already reserved, continue with reservation?", "Seat already reserved", MessageBoxButtons.YesNo) == DialogResult.Yes)
                        {
                            // We continue. First cancel seat.
                            if (!m_seatMngr.CancelSeat(lstReservations.SelectedIndex))
                            {
                                // This should not happen, throw exception
                                throw new Exception("The seat could not be canceled.");
                            }
                            // Then we reserve it
                            if (!m_seatMngr.ReserveSeat(name, price, lstReservations.SelectedIndex))
                            {
                                // This should not happen, throw exception
                                throw new Exception("The seat could not be reserved.");

                            }
                        }
                    }
                }

            }
        }
        
            

        private void UpdateGUI()
        {
            string[] strSeatInfoStrings = new String[20];

            lstReservations.Items.Clear();
            
            m_seatMngr.GetSeatInfoStrings((SeatManager.DisplayOptions)cmbDisplayOption.SelectedIndex, out strSeatInfoStrings); //Get array of seats to show

            
                                                //Denna ToString är bara för test ska egentligen inte finnas
              // lstReservations.Items.Add(strSeatInfoStrings.ToString());
            lblNumOfReservedSeats.Text = "" + m_seatMngr.GetNumReserved();
            lblNumberOfVacant.Text = "" + m_seatMngr.GetNumVacant();
        }

        private void cmbDisplayOption_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateGUI();
            
        }

        private void lbSeats_SelectedIndexChanged(object sender, EventArgs e)
        {
          
        }

        private void MainForm_Load(object sender, EventArgs e)
        {

        }

        private void btnOK_Click(object sender, EventArgs e)

        {
            ReserveOrCancelSeat(SeatManager.DisplayOptions.ReservedSeats);
        }

        }
    }




SeatManager class

 

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Assignment4
{


    class SeatManager
    {
        private readonly int m_totNumOfSeats;
        private double[] m_priceList = new double[0];
        private string[] m_nameList = new string[0];

        public enum DisplayOptions
        {
            AllSeats,
            VacantSeats,
            ReservedSeats
        }


        public SeatManager(int maxNumberofSeats)
        {
            m_totNumOfSeats = maxNumberofSeats;
            m_nameList = new string[m_totNumOfSeats];
            m_priceList = new double[m_totNumOfSeats];

        }

        private bool CheckIndex(int index)
        {
            if (index >= 0 && index < m_totNumOfSeats)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        public int GetNumReserved()
        {

            int numOfResv = 0;

            foreach (string seat in m_nameList)
            {

                if (seat != null)

                    numOfResv++;

            }

            return numOfResv;

        }

        public int GetNumVacant()
        {
            int notReserved = 60;

            foreach (string seat in m_nameList)
            {

                if (seat != null)

                    notReserved--;

            }
            return notReserved;
        }

        public int GetNumOfSeats(DisplayOptions choice)
        {

            if (choice == DisplayOptions.ReservedSeats)
            {
                return GetNumReserved();
            }
            if (choice == DisplayOptions.VacantSeats)
            {
                return GetNumVacant();
            }
            else
            {
                return m_totNumOfSeats;
            }
        }
        public bool ReserveSeat(String name, double price, int index)
        {
           if (m_nameList[index] == null)
            {

                m_nameList[index] = name;
                m_priceList[index] = price;

                return true;
            }
            else
            {
                return false;
            }
        } 
        public bool CancelSeat(int index)
        {
            if (m_nameList[index] == null)
            {
                return false;
            }
            else
            {
                m_nameList[index] = string.Empty;
                m_priceList[index] = 0.0;

                return true;
            }
        }
        public string GetSeatInfoAt(int index)
        {


            for (index = 0; index < m_nameList.Length; index++)
            {
                return m_nameList[index];
            }
            return m_nameList[index];

        }
        public int GetSeatInfoStrings(DisplayOptions choice, out string[] strSeatInfoStrings)
        {

            strSeatInfoStrings = null;
            int count = GetNumOfSeats(choice);

            if ((count <= 0))
                return 0;

            string strOut = "Vacant";
            strSeatInfoStrings = new string[count];
            string priset = "";
            string namnet;

            int i = 0; //counter for return array
            // is the element corresponding with the index empty
            for (int index = 0; index <= m_totNumOfSeats - 1; index++)
            {
                if (m_nameList[index] != null)
                {
                     strOut = "Reserverad";


                }
                else
                {
                     strOut = "Vacans";
                }
                if (choice == DisplayOptions.VacantSeats)
                {
                    priset = m_priceList[index].ToString();
                    namnet = m_nameList[index];
                }
                else if (choice == DisplayOptions.ReservedSeats)
                {
                    priset = m_nameList[index].ToString();
                    namnet = m_nameList[index];
                }
                else
                {
                    priset = m_priceList[index].ToString();
                    namnet = m_nameList[index];
                }
                if (i < strSeatInfoStrings.Length)
                    strSeatInfoStrings[index++] = string.Format("{0,5}{1, 35}{2, 35}{3,40}", index, strOut, namnet, priset);
            }
            return i;
            }

        
    }
    
        }


And finally the MainForm designer class


namespace Assignment4
{
    partial class MainForm
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.btnOK = new System.Windows.Forms.Button();
            this.lab1 = new System.Windows.Forms.Label();
            this.lab2 = new System.Windows.Forms.Label();
            this.lab4 = new System.Windows.Forms.Label();
            this.rbtnReserve = new System.Windows.Forms.RadioButton();
            this.rbtnCancel = new System.Windows.Forms.RadioButton();
            this.grpInput = new System.Windows.Forms.GroupBox();
            this.lblPrice = new System.Windows.Forms.Label();
            this.lblName = new System.Windows.Forms.Label();
            this.txtName = new System.Windows.Forms.TextBox();
            this.grpOutput = new System.Windows.Forms.GroupBox();
            this.lblNumberOfVacant = new System.Windows.Forms.Label();
            this.lblNumOfReservedSeats = new System.Windows.Forms.Label();
            this.lblNumOfSeats = new System.Windows.Forms.Label();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.cmbDisplayOption = new System.Windows.Forms.ComboBox();
            this.lstReservations = new System.Windows.Forms.ListBox();
            this.txtPrice = new System.Windows.Forms.NumericUpDown();
            this.grpInput.SuspendLayout();
            this.grpOutput.SuspendLayout();
            this.groupBox1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.txtPrice)).BeginInit();
            this.SuspendLayout();
            // 
            // btnOK
            // 
            this.btnOK.Location = new System.Drawing.Point(27, 91);
            this.btnOK.Name = "btnOK";
            this.btnOK.Size = new System.Drawing.Size(122, 26);
            this.btnOK.TabIndex = 0;
            this.btnOK.Text = "Reserv / Cancel";
            this.btnOK.UseVisualStyleBackColor = true;
            this.btnOK.Click += new System.EventHandler(this.btnOK_Click);
            // 
            // lab1
            // 
            this.lab1.AutoSize = true;
            this.lab1.Cursor = System.Windows.Forms.Cursors.No;
            this.lab1.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
            this.lab1.Location = new System.Drawing.Point(24, 170);
            this.lab1.Name = "lab1";
            this.lab1.Size = new System.Drawing.Size(89, 13);
            this.lab1.TabIndex = 1;
            this.lab1.Text = "Number of Seats:";
            // 
            // lab2
            // 
            this.lab2.AutoSize = true;
            this.lab2.Location = new System.Drawing.Point(24, 196);
            this.lab2.Name = "lab2";
            this.lab2.Size = new System.Drawing.Size(108, 13);
            this.lab2.TabIndex = 1;
            this.lab2.Text = "Number of Reserved:";
            // 
            // lab4
            // 
            this.lab4.AutoSize = true;
            this.lab4.Location = new System.Drawing.Point(24, 223);
            this.lab4.Name = "lab4";
            this.lab4.Size = new System.Drawing.Size(96, 13);
            this.lab4.TabIndex = 1;
            this.lab4.Text = "Number of Vacant:";
            // 
            // rbtnReserve
            // 
            this.rbtnReserve.AutoSize = true;
            this.rbtnReserve.Location = new System.Drawing.Point(15, 14);
            this.rbtnReserve.Name = "rbtnReserve";
            this.rbtnReserve.Size = new System.Drawing.Size(65, 17);
            this.rbtnReserve.TabIndex = 2;
            this.rbtnReserve.TabStop = true;
            this.rbtnReserve.Text = "Reserve";
            this.rbtnReserve.UseVisualStyleBackColor = true;
            // 
            // rbtnCancel
            // 
            this.rbtnCancel.AutoSize = true;
            this.rbtnCancel.Location = new System.Drawing.Point(108, 14);
            this.rbtnCancel.Name = "rbtnCancel";
            this.rbtnCancel.Size = new System.Drawing.Size(98, 17);
            this.rbtnCancel.TabIndex = 2;
            this.rbtnCancel.TabStop = true;
            this.rbtnCancel.Text = "Cancel Reserv.";
            this.rbtnCancel.UseVisualStyleBackColor = true;
            // 
            // grpInput
            // 
            this.grpInput.Controls.Add(this.txtPrice);
            this.grpInput.Controls.Add(this.lblPrice);
            this.grpInput.Controls.Add(this.lblName);
            this.grpInput.Controls.Add(this.rbtnReserve);
            this.grpInput.Controls.Add(this.txtName);
            this.grpInput.Controls.Add(this.rbtnCancel);
            this.grpInput.Location = new System.Drawing.Point(12, 7);
            this.grpInput.Name = "grpInput";
            this.grpInput.Size = new System.Drawing.Size(212, 121);
            this.grpInput.TabIndex = 4;
            this.grpInput.TabStop = false;
            this.grpInput.Text = "Booking Input";
            // 
            // lblPrice
            // 
            this.lblPrice.AutoSize = true;
            this.lblPrice.Location = new System.Drawing.Point(159, 42);
            this.lblPrice.Name = "lblPrice";
            this.lblPrice.Size = new System.Drawing.Size(31, 13);
            this.lblPrice.TabIndex = 5;
            this.lblPrice.Text = "Price";
            // 
            // lblName
            // 
            this.lblName.AutoSize = true;
            this.lblName.Location = new System.Drawing.Point(55, 42);
            this.lblName.Name = "lblName";
            this.lblName.Size = new System.Drawing.Size(35, 13);
            this.lblName.TabIndex = 4;
            this.lblName.Text = "Name";
            // 
            // txtName
            // 
            this.txtName.Location = new System.Drawing.Point(15, 58);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(122, 20);
            this.txtName.TabIndex = 3;
            // 
            // grpOutput
            // 
            this.grpOutput.Controls.Add(this.lblNumberOfVacant);
            this.grpOutput.Controls.Add(this.lblNumOfReservedSeats);
            this.grpOutput.Controls.Add(this.lblNumOfSeats);
            this.grpOutput.Location = new System.Drawing.Point(12, 149);
            this.grpOutput.Name = "grpOutput";
            this.grpOutput.Size = new System.Drawing.Size(212, 151);
            this.grpOutput.TabIndex = 4;
            this.grpOutput.TabStop = false;
            this.grpOutput.Text = "Output Data";
            // 
            // lblNumberOfVacant
            // 
            this.lblNumberOfVacant.AutoSize = true;
            this.lblNumberOfVacant.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.lblNumberOfVacant.Location = new System.Drawing.Point(150, 74);
            this.lblNumberOfVacant.Name = "lblNumberOfVacant";
            this.lblNumberOfVacant.Size = new System.Drawing.Size(27, 15);
            this.lblNumberOfVacant.TabIndex = 2;
            this.lblNumberOfVacant.Text = "240";
            // 
            // lblNumOfReservedSeats
            // 
            this.lblNumOfReservedSeats.AutoSize = true;
            this.lblNumOfReservedSeats.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.lblNumOfReservedSeats.Location = new System.Drawing.Point(150, 47);
            this.lblNumOfReservedSeats.Name = "lblNumOfReservedSeats";
            this.lblNumOfReservedSeats.Size = new System.Drawing.Size(27, 15);
            this.lblNumOfReservedSeats.TabIndex = 1;
            this.lblNumOfReservedSeats.Text = "      ";
            // 
            // lblNumOfSeats
            // 
            this.lblNumOfSeats.AutoSize = true;
            this.lblNumOfSeats.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.lblNumOfSeats.Location = new System.Drawing.Point(150, 20);
            this.lblNumOfSeats.Name = "lblNumOfSeats";
            this.lblNumOfSeats.Size = new System.Drawing.Size(27, 15);
            this.lblNumOfSeats.TabIndex = 0;
            this.lblNumOfSeats.Text = "240";
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.cmbDisplayOption);
            this.groupBox1.Controls.Add(this.lstReservations);
            this.groupBox1.Location = new System.Drawing.Point(246, 22);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(360, 270);
            this.groupBox1.TabIndex = 4;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Booking Input";
            // 
            // cmbDisplayOption
            // 
            this.cmbDisplayOption.AccessibleDescription = "";
            this.cmbDisplayOption.AccessibleName = "";
            this.cmbDisplayOption.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cmbDisplayOption.FormattingEnabled = true;
            this.cmbDisplayOption.Location = new System.Drawing.Point(233, 19);
            this.cmbDisplayOption.Name = "cmbDisplayOption";
            this.cmbDisplayOption.Size = new System.Drawing.Size(121, 21);
            this.cmbDisplayOption.TabIndex = 1;
            this.cmbDisplayOption.Tag = "";
            this.cmbDisplayOption.SelectedIndexChanged += new System.EventHandler(this.cmbDisplayOption_SelectedIndexChanged);
            // 
            // lstReservations
            // 
            this.lstReservations.FormattingEnabled = true;
            this.lstReservations.Items.AddRange(new object[] {
            "lstReservations"});
            this.lstReservations.Location = new System.Drawing.Point(6, 53);
            this.lstReservations.Name = "lstReservations";
            this.lstReservations.Size = new System.Drawing.Size(354, 212);
            this.lstReservations.TabIndex = 0;
            this.lstReservations.SelectedIndexChanged += new System.EventHandler(this.lbSeats_SelectedIndexChanged);
            // 
            // txtPrice
            // 
            this.txtPrice.Location = new System.Drawing.Point(143, 59);
            this.txtPrice.Name = "txtPrice";
            this.txtPrice.Size = new System.Drawing.Size(63, 20);
            this.txtPrice.TabIndex = 6;
            // 
            // MainForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(618, 304);
            this.Controls.Add(this.lab4);
            this.Controls.Add(this.lab2);
            this.Controls.Add(this.lab1);
            this.Controls.Add(this.btnOK);
            this.Controls.Add(this.grpOutput);
            this.Controls.Add(this.groupBox1);
            this.Controls.Add(this.grpInput);
            this.Name = "MainForm";
            this.Text = "CBC Cinema Booking System";
            this.Load += new System.EventHandler(this.MainForm_Load);
            this.grpInput.ResumeLayout(false);
            this.grpInput.PerformLayout();
            this.grpOutput.ResumeLayout(false);
            this.grpOutput.PerformLayout();
            this.groupBox1.ResumeLayout(false);
            ((System.ComponentModel.ISupportInitialize)(this.txtPrice)).EndInit();
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        

        private System.Windows.Forms.Button btnOK;
        private System.Windows.Forms.Label lab2;
        private System.Windows.Forms.Label lab4;
        private System.Windows.Forms.RadioButton rbtnReserve;
        private System.Windows.Forms.RadioButton rbtnCancel;
        private System.Windows.Forms.GroupBox grpInput;
        private System.Windows.Forms.GroupBox grpOutput;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.TextBox txtName;
        private System.Windows.Forms.Label lblPrice;
        private System.Windows.Forms.Label lblName;
        private System.Windows.Forms.Label lab1;
        private System.Windows.Forms.Label lblNumOfSeats;
        private System.Windows.Forms.Label lblNumberOfVacant;
        private System.Windows.Forms.Label lblNumOfReservedSeats;
        private System.Windows.Forms.ListBox lstReservations;
        private System.Windows.Forms.ComboBox cmbDisplayOption;
        private System.Windows.Forms.NumericUpDown txtPrice;
        }
    }


This post has been edited by donderma: 28 September 2011 - 03:14 PM


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Replies To: Help me with an error problem please

#2 AdamSpeight2008  Icon User is offline

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Re: Help me with an error problem please

Posted 28 September 2011 - 03:34 PM

Can't post the code into Visual Studio, as it'll have loads of errors.

Of missing controls. The GUI of the Form is a separate (partial) file

Could post the actual error message.
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#3 eclipsed4utoo  Icon User is offline

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Re: Help me with an error problem please

Posted 28 September 2011 - 07:01 PM

I copied all of the code and it builds fine.

YOU need to tell us WHERE the error is occuring, WHAT the error is(exact error message), and HOW to replicate it. I have all of your code running, but I don't know how to make the error occur. Therefore, I can't help you fix the issue.
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#4 Ionut  Icon User is offline

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Re: Help me with an error problem please

Posted 28 September 2011 - 09:42 PM

 
if (m_nameList[index] == null)


what is wrong with this line? m_nameList is an array of doubles, so none of its items won't be ever null(will always return false)
The initialization of the array
double[] m_nameList = new double[whatever_value]


creates an array filled with zeros(0.0). If zero is an option in your program, you have to force a filling with -1.

This post has been edited by Ionut: 28 September 2011 - 09:43 PM

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#5 donderma  Icon User is offline

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Re: Help me with an error problem please

Posted 06 October 2011 - 01:11 PM

View Posteclipsed4utoo, on 28 September 2011 - 07:01 PM, said:

I copied all of the code and it builds fine.

YOU need to tell us WHERE the error is occuring, WHAT the error is(exact error message), and HOW to replicate it. I have all of your code running, but I don't know how to make the error occur. Therefore, I can't help you fix the issue.


eclipsed4utoo it occurs as soon as you put in values in the interface. for instance if you put John in the name box and 12 in the price box it refuses to be edmitted

This post has been edited by donderma: 06 October 2011 - 01:14 PM

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#6 donderma  Icon User is offline

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Re: Help me with an error problem please

Posted 06 October 2011 - 01:18 PM

View PostIonut, on 28 September 2011 - 09:42 PM, said:

 
if (m_nameList[index] == null)


what is wrong with this line? m_nameList is an array of doubles, so none of its items won't be ever null(will always return false)
The initialization of the array
double[] m_nameList = new double[whatever_value]


creates an array filled with zeros(0.0). If zero is an option in your program, you have to force a filling with -1.


Im not sure if i understand what you mean. Can you clarify what you mean?
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