類不（由於其保護級別Tickets.TicketForm.lastSectionNumber是無法訪問）返回一個對象

Question

它不承認我的lstSectionNumber。希望我能清楚地說明一切，我剛剛開始學習C＃，希望能得到任何幫助。先謝謝你。

public class TicketOrder 
{ 
    private static int premiumTicket = 40; 
    private static int basicTicket = 20; 
    private static int serviceCharge = 2; 
    private TicketForm form = new TicketForm(); 

    public double CalcTicketCost(int section, double quantity) 
    { 
     double amount = 0; 
     if (int.Parse(form.lstSectionNumber.SelectedItem.Value) <= 150) 
     { 
      amount = (quantity*premiumTicket) + (quantity*serviceCharge); 
      return amount; 
     } 
     else 
     { 
      amount = (quantity*basicTicket) + (quantity*serviceCharge); 
     } 
     return amount; 
    } 
} 

代碼隱藏：

public partial class TicketForm : System.Web.UI.Page 
{ 
    int myInt; 

    public const double premiumTicket = 40; 
    public const double basicTicket = 20; 
    public const double serviceCharge = 2; 
    TicketUser user = new TicketUser(); 
    TicketOrder order = new TicketOrder(); 

    protected void Page_Load(object sender, EventArgs e) 
    { 
     // This disables the unobtrusive validation in order to see the result 

     this.UnobtrusiveValidationMode = System.Web.UI.UnobtrusiveValidationMode.None; 

      // This will keep my five numbers in my list box without adding more with a refresh of a page 
      if (!IsPostBack) 
      { 

       Random RandomSection = new Random(); 
       for (int i = 0; i < 5; i++) 
       { 
        // Created a list box with five random numbers from 1 to 300 
        myInt = RandomSection.Next(1, 300); 
        lstSectionNumber.Items.Add(myInt.ToString()); 

       } 
      } 

    } 

    protected void btnSubmit_Click(object sender, EventArgs e) 
    { 
     // I also added TextMode="Number"to my <asp:TextBox ID="txtNumberOfTickets" 
     // runat="server" Height="18px" Width="134px"></asp:TextBox> code in order 
     // to get rid of an error incase I left my txtNumberOfTicket empty 
     int section = Convert.ToInt32(lstSectionNumber.SelectedValue); 

    double ticketQuantity = Convert.ToInt32(txtNumberOfTickets.Text); 


    //This label displays users first and last names, number of tickers, seat section number and ticket price 
    lblPrice.Text = txtFirstName.Text + " " + 
        txtLastName.Text + ", " + 
        txtNumberOfTickets.Text + " " + 
        "Tickets in Section:" + " " + 
        lstSectionNumber.SelectedValue + "," + 
        " Total Cost is: " + 
        order.CalcTicketCost(section, ticketQuantity).ToString("C"); 
    } 

    protected void btnCreateAccount_Click(object sender, EventArgs e) 
    { 
     user.firstName = txtFirstName.Text; 
     user.lastName = txtLastName.Text; 
     user.username = txtUserName.Text; 
     lblCreateAccount.Text = user.CreateAccount(); 
    } 
} 

Answer 1

嗯，我想通了。

if (section <= 150) 
    { amount = (quantity * premiumTicket) + (quantity * serviceCharge); 
    return amount; 

Answer 2

，只需提供您的構造空體

變化

public TicketOrder() 

到

public TicketOrder() { } 

爲了解決您的其他問題，您正在嘗試創建一個新頁面，但asp.NET已經爲此頁面加載創建了一個頁面，併爲您填充了值。您應該將當前頁面對象傳遞給您的TicketOrder構造函數，然後保存。

像這樣：

public TicketOrder(TicketForm form) 
{ 
    this.form = form; 
} 

在TicketOrder

和變化

private TicketForm form = new TicketForm(); 

到

private TicketForm form; 

和變化TicketForm

TicketOrder order = new TicketOrder(); 

到

TicketOrder order; 
public TicketForm() 
{ 
    this.order = new TicketOrder(this); 
}