"无法修改控件集合，因为控件包含代码块"

我试图创建一个简单的用户控件，这是一个滑块。当我添加一个AjaxToolkit SliderExtender到用户控件时，我得到这个(*&$#()@#错误:

Server Error in '/' Application. The Controls collection cannot be modified because the control contains code blocks (i.e. `<% ... %>`). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. `<% ... %>`).

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. `<% ... %>`).]    System.Web.UI.ControlCollection.Add(Control child) +8677431    AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) in d:\E\AjaxTk-AjaxControlToolkit\Release\AjaxControlToolkit\ExtenderBase\ScriptObjectBuilder.cs:293 AjaxControlToolkit.ExtenderControlBase.OnLoad(EventArgs e) in d:\E\AjaxTk-AjaxControlToolkit\Release\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:306 System.Web.UI.Control.LoadRecursive()
+50    System.Web.UI.Control.LoadRecursive()
+141    System.Web.UI.Control.LoadRecursive()
+141    System.Web.UI.Control.LoadRecursive()
+141    System.Web.UI.Control.LoadRecursive()             
+141    System.Web.UI.Control.LoadRecursive()
+141    System.Web.UI.Control.LoadRecursive()
+141    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627


Version Information: Microsoft .NET Framework Version:2.0.50727.3074; ASP.NET Version:2.0.50727.3074

我尝试在用户控件中放置一个占位符，并以编程方式将文本框和滑块扩展器添加到占位符，但我仍然得到错误。

下面是简单的代码:

<table cellpadding="0" cellspacing="0" style="width:100%">
    <tbody>
        <tr>
            <td></td>
            <td>
                <asp:Label ID="lblMaxValue" runat="server" Text="Maximum" CssClass="float_right" />
                <asp:Label ID="lblMinValue" runat="server" Text="Minimum" />
            </td>
        </tr>
        <tr>
            <td style="width:60%;">
                <asp:CheckBox ID="chkOn" runat="server" />
                <asp:Label ID="lblPrefix" runat="server" />:&nbsp;
                <asp:Label ID="lblSliderValue" runat="server" />&nbsp;
                <asp:Label ID="lblSuffix" runat="server" />
            </td>
            <td style="text-align:right;width:40%;">                

                    <asp:TextBox ID="txtSlider" runat="server" Text="50" style="display:none;" />
                    <ajaxToolkit:SliderExtender ID="seSlider" runat="server" 
                        BehaviorID="seSlider" 
                        TargetControlID="txtSlider" 
                        BoundControlID="lblSliderValue" 
                        Orientation="Horizontal" 
                        EnableHandleAnimation="true" 
                        Length="200" 
                        Minimum="0" 
                        Maximum="100" 
                        Steps="1" />

            </td>
        </tr>
    </tbody>
</table>

有什么问题吗?

当前回答

在我的情况下，我得到这个错误，因为我错误地设置InnerText到一个div与html里面。

例子:

SuccessMessagesContainer.InnerText = "";

   <div class="SuccessMessages ui-state-success" style="height: 25px; display: none;" id="SuccessMessagesContainer" runat="server">
      <table>
         <tr>
            <td style="width: 80px; vertical-align: middle; height: 18px; text-align: center;">
               <img src="<%=Image_success_icn %>" style="margin: 0 auto; height: 18px;
                  width: 18px;" />
            </td>
            <td id="SuccessMessage" style="vertical-align: middle;" class="SuccessMessage" runat="server" >
            </td>
         </tr>
      </table>
   </div>

2016-03-17 17:02:05

其他回答

如果您在页面中使用脚本管理器，则可以执行相同的功能。你只需要像这样注册脚本

<asp:ScriptManager ID="ScriptManager1" runat="server" LoadScriptsBeforeUI="true"   EnablePageMethods="true">  
<Scripts>
      <asp:ScriptReference Path="~/Styles/javascript/jquery.min.js" />
</Scripts>
</asp:ScriptManager>

2010-09-21 06:53:20

我在不同的情况下遇到了同样的问题。在body标签中有一个简单的元素。解决方案是:

<asp:PlaceHolder ID="container" runat="server">
    <a id="child" href="<%# variable %>">Change me</a>
</asp:PlaceHolder>

protected new void Page_Load(object sender, EventArgs e)
{    
    Page.Form.DataBind(); // I neded to Call DataBind on Form not on Header
    container.InnerHtml = "Simple text";
}

2018-02-06 19:11:21

将JavaScript放在div标签下。

<div runat="server"> //div tag must have runat server
  //Your JavaScript code goes here....
</div>

它会工作! !

2011-01-14 07:34:46

另一种方法是使用另一个.aspx页面作为您想要链接的页面。

这是Masterpage的页眉的样子:

<head runat="server">
    <asp:ContentPlaceHolder ID="head" runat="server">
    </asp:ContentPlaceHolder>
    <link href="CSS/AccordionStyles.aspx" rel="stylesheet" type="text/css" />
</head>

引用的.aspx表单包含您的内容:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AccordionStyles.aspx.cs" Inherits="IntranetConnectCMS.CSS.AccordionStyles" %>
.AccordionHeader
{
    cursor: pointer;
    background-image: url(<%=ResolveUrl("~/Images/Backgrounds/AccordionPaneHeaderClosed.png") %>);
    background-repeat: no-repeat;
}

.AccordionHeaderSelected
{
    cursor: pointer;
    background-image: url(<%=ResolveUrl("~/Images/Backgrounds/AccordionPaneHeaderOpen.png") %>);
    background-repeat: no-repeat;
}
.AccordionContent
{
    background-image: url(<%=ResolveUrl("~/Images/Backgrounds/AccordionPaneContent.png") %>);
    background-repeat: no-repeat;
}

最后，你需要.aspx页面来告诉浏览器你正在发送CSS内容:

protected void Page_Load(object sender, EventArgs e)
{
    Response.ContentType = "text/css";
}

2011-10-07 22:51:37

我在用户控件中也有同样的问题。我的页面，托管控件有评论在头部标签，我删除了那些评论，一切工作之后。一些帖子还建议将脚本从头部移到正文中。

2009-05-14 19:21:53

"无法修改控件集合，因为控件包含代码块"

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