Question

我打开了我的项目和这个错误，我不知道他们究竟是什么意思：错误出现在我的更新面板的'ID'属性上。我搜索了谷歌和搜索引擎优化但没有找到任何内容。

id属性对于没有从控件继承的标记
无效

我以前从未见过这个，所以我不太确定出了什么问题，因为它昨天没有抛出这个错误，也没有看到任何语法错误。

我唯一的线索是它可能与aspx指令或aspx继承的母版页有关。

这是抛出错误的代码块：

<div class="form-group">               
        <label  class="col-lg-4 control-label">Course:</label>
        <div class="col-lg-8">
            <asp:UpdatePanel ID="updateCourse" runat="server">
                <ContentTemplate>
                <asp:DropDownList ID="ddlCourse" CssClass="form-control" runat="server" AutoPostBack="True">
                    <asp:ListItem Value="2">Select Course</asp:ListItem>
                </asp:DropDownList>
             </ContentTemplate> 
                <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="ddlFaculty" EventName="SelectedIndexChanged"/>
                    </Triggers>                                        
            </asp:UpdatePanel>
        </div>                  
    </div>               
</div>

页面指令包含其中的内容：

<%@ Page Title=""  MaintainScrollPositionOnPostback="true" Language="C#"  MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="AddStudent.aspx.cs" Inherits="AddStudent" EnableEventValidation="false" %>

aspx继承的.master：

    <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="IT7x11Project.SiteMaster" %>

<!DOCTYPE html>
<html lang="en">
<head runat="server">
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title><%: Page.Title %> - My ASP.NET Application</title>
    <asp:PlaceHolder runat="server">
        <%: Scripts.Render("~/bundles/modernizr") %>
    </asp:PlaceHolder>
    <webopt:BundleReference runat="server" Path="~/Content/css" />
    <link href="~/favicon.ico" rel="shortcut icon" type="image/x-icon" />
</head>
<body>
    <form runat="server">
        <asp:ScriptManager runat="server">
            <Scripts>
                <%--Framework Scripts--%>
                <asp:ScriptReference Name="MsAjaxBundle" />
                <asp:ScriptReference Name="jquery" />
                <asp:ScriptReference Name="bootstrap" />
                <asp:ScriptReference Name="respond" />
                <asp:ScriptReference Name="WebForms.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebForms.js" />
                <asp:ScriptReference Name="WebUIValidation.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebUIValidation.js" />
                <asp:ScriptReference Name="MenuStandards.js" Assembly="System.Web" Path="~/Scripts/WebForms/MenuStandards.js" />
                <asp:ScriptReference Name="GridView.js" Assembly="System.Web" Path="~/Scripts/WebForms/GridView.js" />
                <asp:ScriptReference Name="DetailsView.js" Assembly="System.Web" Path="~/Scripts/WebForms/DetailsView.js" />
                <asp:ScriptReference Name="TreeView.js" Assembly="System.Web" Path="~/Scripts/WebForms/TreeView.js" />
                <asp:ScriptReference Name="WebParts.js" Assembly="System.Web" Path="~/Scripts/WebForms/WebParts.js" />
                <asp:ScriptReference Name="Focus.js" Assembly="System.Web" Path="~/Scripts/WebForms/Focus.js" />
                <asp:ScriptReference Name="WebFormsBundle" />
                <%--Site Scripts--%>
            </Scripts>
        </asp:ScriptManager>
        <div class="navbar navbar-inverse navbar-fixed-top">
            <div class="container">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </button>
                    <a class="navbar-brand" runat="server" href="~/">Application name</a>
                </div>
                <div class="navbar-collapse collapse">
                    <ul class="nav navbar-nav">
                        <li><a runat="server" href="~/">Home</a></li>
                        <li><a runat="server" href="~/About">About</a></li>
                        <li><a runat="server" href="~/Contact">Contact</a></li>
                    </ul>
                    <asp:LoginView runat="server" ViewStateMode="Disabled">
                        <AnonymousTemplate>
                            <ul class="nav navbar-nav navbar-right">
                                <li><a runat="server" href="~/Account/Register">Register</a></li>
                                <li><a runat="server" href="~/Account/Login">Log in</a></li>
                            </ul>
                        </AnonymousTemplate>
                        <LoggedInTemplate>
                            <ul class="nav navbar-nav navbar-right">
                                <li><a runat="server" href="~/Account/Manage" title="Manage your account">Hello, <%: Context.User.Identity.GetUserName()  %> !</a></li>
                                <li>
                                    <asp:LoginStatus runat="server" LogoutAction="Redirect" LogoutText="Log off" LogoutPageUrl="~/" OnLoggingOut="Unnamed_LoggingOut" />
                                </li>
                            </ul>
                        </LoggedInTemplate>
                    </asp:LoginView>
                </div>
            </div>
        </div>
        <div class="container body-content">
            <asp:ContentPlaceHolder ID="MainContent" runat="server">
            </asp:ContentPlaceHolder>
            <hr />
            <footer>
                <p>&copy; <%: DateTime.Now.Year %> - My ASP.NET Application</p>
            </footer>
        </div>
    </form>
</body>
</html>

ASP.NET：id属性对于未从控件继承的标记无效

0 个答案: