Question

我目前在ASP中遇到问题，说我的代码中的一个项目不存在，但它存在于设计器文件中，并且在ASPX和ASPX.CS文件上都正确命名，我无法弄清楚为什么这个问题是发生的历史。因为它说userLabel目前不存在，我似乎无法理解为什么我的其他页面正常工作。

ASPX代码：

<%@ Page Language="C#" AutoEventWireup="True" CodeBehind="Homepage.aspx.cs" Inherits="Assignment2ASP.Homepage" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Logged In Page</title>
</head>
<body>
<p>This is the Logged In page</p>

<form id="logoutform" runat="server">
    <asp:Button ID="logoutButton" Text="Logout" runat="server" OnClick="logoutEventMethod" />
    <p>Hello</p>
    <p>
    <asp:Label ID="userLabel" Text ="No User" runat="server" />
    </p>

</form>
</body>
</html>

ASPX.CS代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class LoggedIn : System.Web.UI.Page
{
String name;
protected void Page_Load(object sender, EventArgs e)
{
    name = (String)(Session["uname"]);
    if (name == null)
    {
        Response.BufferOutput = true;
        Response.Redirect("index.aspx", true);
    }
    else
    {
        userLabel.Text = name;
    }
}

protected void logoutEventMethod(object sender, EventArgs e)
{
    Session["uname"] = null;
    Session.Abandon();
    Response.BufferOutput = true;
    Response.Redirect("index.aspx", true);
}
}

设计师档案：

namespace Assignment2ASP {


public partial class Homepage {

    /// <summary>
    /// logoutform control.
    /// </summary>
    /// <remarks>
    /// Auto-generated field.
    /// To modify move field declaration from designer file to code-behind file.
    /// </remarks>
    protected global::System.Web.UI.HtmlControls.HtmlForm logoutform;

    /// <summary>
    /// logoutButton control.
    /// </summary>
    /// <remarks>
    /// Auto-generated field.
    /// To modify move field declaration from designer file to code-behind file.
    /// </remarks>
    protected global::System.Web.UI.WebControls.Button logoutButton;

    /// <summary>
    /// userLabel control.
    /// </summary>
    /// <remarks>
    /// Auto-generated field.
    /// To modify move field declaration from designer file to code-behind file.
    /// </remarks>
    protected global::System.Web.UI.WebControls.Label userLabel;
}
}

任何帮助都会受到极大的赞赏谢谢！

Answer 1

问题是aspx.cs文件中的类名与设计器文件中的类名不同。将代码隐藏文件中的类从LoggedIn重命名为Homepage可以解决错误。

Answer 2

试试这个

Label lb = (Label)FindControl("userLabel");
lb.Text = "New text";

ASP在当前上下文错误中不存在

2 个答案: