2

我刚刚在 VS 2012 中创建了一个新的 Web 窗体应用程序，我正在尝试获取位于 Login.aspx 页面中的“用户名”文本框的值，我得到的只是“当前上下文中不存在用户名的名称”当试图在 login.aspx.cs 文件中访问它时......

ASPX 文件：

    <%@ Page Title="Log in" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="WebApplication1.Account.Login" %>
<%@ Register Src="~/Account/OpenAuthProviders.ascx" TagPrefix="uc" TagName="OpenAuthProviders" %>

<asp:Content runat="server" ID="BodyContent" ContentPlaceHolderID="MainContent">
    <hgroup class="title">
        <h1><%: Title %>.</h1>
    </hgroup>
    <section id="loginForm">
        <h2>Use a local account to log in.</h2>
        <asp:Login runat="server" ViewStateMode="Disabled" RenderOuterTable="false">
            <LayoutTemplate>
                <p class="validation-summary-errors">
                    <asp:Literal runat="server" ID="FailureText" />
                </p>
                <fieldset>
                    <legend>Log in Form</legend>
                    <ol>
                        <li>
                            <asp:Label runat="server" AssociatedControlID="UserName">User name</asp:Label>
                            <asp:TextBox runat="server" ID="UserName" />
                            <asp:RequiredFieldValidator runat="server" ControlToValidate="UserName" CssClass="field-validation-error" ErrorMessage="The user name field is required." />
                        </li>
                        <li>
                            <asp:Label runat="server" AssociatedControlID="Password">Password</asp:Label>
                            <asp:TextBox runat="server" ID="Password" TextMode="Password" />
                            <asp:RequiredFieldValidator runat="server" ControlToValidate="Password" CssClass="field-validation-error" ErrorMessage="The password field is required." />
                        </li>
                        <li>
                            <asp:CheckBox runat="server" ID="RememberMe" />
                            <asp:Label runat="server" AssociatedControlID="RememberMe" CssClass="checkbox">Remember me?</asp:Label>
                        </li>
                    </ol>
                    <asp:Button runat="server" CommandName="Login" Text="Log in" />
                </fieldset>
            </LayoutTemplate>
        </asp:Login>
        <p>
            <asp:HyperLink runat="server" ID="RegisterHyperLink" ViewStateMode="Disabled">Register</asp:HyperLink>
            if you don't have an account.
        </p>
    </section>

    <section id="socialLoginForm">
        <h2>Use another service to log in.</h2>
        <uc:OpenAuthProviders runat="server" ID="OpenAuthLogin" />
    </section>
</asp:Content>

CS文件：

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

namespace WebApplication1.Account
{
    public partial class Login : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string id = UserName.Text;
        }
    }
}

编辑：添加了自动生成的 aspx.designer.cs 文件：

    //------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated. 
// </auto-generated>
//------------------------------------------------------------------------------

namespace WebApplication1.Account
{


    public partial class Login
    {

        /// <summary>
        /// RegisterHyperLink 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.HyperLink RegisterHyperLink;

        /// <summary>
        /// OpenAuthLogin control.
        /// </summary>
        /// <remarks>
        /// Auto-generated field.
        /// To modify move field declaration from designer file to code-behind file.
        /// </remarks>
        protected global::WebApplication1.Account.OpenAuthProviders OpenAuthLogin;
    }
}

任何帮助将不胜感激。

4

3 回答 3

2

一方面，您应该命名您的Login控件（例如Login1）。然后像这样引用它：

    protected void Page_Load(object sender, EventArgs e)
    {
        string id = Login1.UserName;
    }
于 2013-07-26T20:42:22.790 回答
0

（应OP的要求将评论转换为答案）

啊，我看到 UserName 包含在<LayoutTemplate>. 设计师产生的混乱控制。如果您将文本框移到外面，那么它会起作用，但是如果您正在使用<asp:Login>（我不建议您这样做），您并不意味着直接从您的代码隐藏中访问控件。

于 2013-07-26T21:15:13.940 回答
0

因为您使用 LoginControl。尝试这个 ：

TextBox tb = (TextBox)Login1.FindControl("UserName");
于 2013-07-26T19:44:21.903 回答