＆QUOT; Controls集合不能修改，因为该控件包含code块＆QUOT;

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问题描述

我想创建一个简单的用户控件是一个滑块。当我添加一个AjaxToolkit SliderExtender用户控件我得到这个（*安培; $＃（）@＃错误：

I am trying to create a simple user control that is a slider. When I add a AjaxToolkit SliderExtender to the user control I get this (*&$#()@# error:


    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

我试图把用户控件的占位符和编程方式添加文本框和滑块扩展到占位符，我仍然得到错误。

I have tried putting a placeholder in the user control and adding the textbox and slider extender to the placeholder programmatically and I still get the error.

下面是一个简单的code：

Here is the simple code:

<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>

这是什么问题？

推荐答案

首先，启动code座以＆lt;％＃代替＆LT;％=：

First, start the code block with <%# instead of <%= :

<head id="head1" runat="server">
  <title>My Page</title>
  <link href="css/common.css" rel="stylesheet" type="text/css" />
  <script type="text/javascript" src="<%# ResolveUrl("~/javascript/leesUtils.js") %>"></script>
</head>

这改变了从一个回复于code块code座到绑定前pression。结果
由于＆LT;％＃......％＆GT; 绑定前pressions不是code块，CLR将不会抱怨。然后在code母版页，你会添加以下内容：

This changes the code block from a Response.Write code block to a databinding expression.
Since <%# ... %> databinding expressions aren't code blocks, the CLR won't complain. Then in the code for the master page, you'd add the following:

protected void Page_Load(object sender, EventArgs e)
{
  Page.Header.DataBind();
}

这篇关于＆QUOT; Controls集合不能修改，因为该控件包含code块＆QUOT;的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！