ASP / C＃代码后面不能达到从标记控制 [英] ASP/C# code behind can not reach control from markup

问题描述

问题：结果
我有一个这样的标记（仅重要的行）：

Issue:
I have a markup like this (only the important lines):

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RTDeluxe.ascx.cs"
Inherits="MainSolution.CONTROLTEMPLATES.Kunde.RTDeluxe" %>
<ul id="linkUl" class="teaserLinksUL" runat="server"/>

代码隐藏：

The code-behind:

namespace MainSolution.CONTROLTEMPLATES.Kunde
public partial class RTDeluxe : UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        linkUl.InnerHtml = string.Empty;
    }
}

我可以访问 UL 中的代码隐藏，并没有得到编译错误。但是，当我调试的代码，我收到了的NullReferenceException ，因为 linkUl 为NULL。

I can access the ul inside the code-behind and get no compilation error. But, when I debug the code I get a NullReferenceException because linkUl is NULL.

首先，我认为命名空间的原因。但是，几次尝试后，我敢肯定，他们是正确的。在 FileLocation 似乎是正确的，我的IIS的 CONTROLTEMPLATES 文件夹中有与相应的ascx文件孔德文件夹中。在它

First I thought that the namespaces are the reason. But, after several tries, I'm sure that they're correct. The FileLocation seems to be correct and the controltemplates folder of my iis has a "Kunde" folder with the corresponding ascx files in it.

我有相同结构的其他.ascx文件 - >他们的工作就像一个魅力

I have other .ascx files with the same structure -> they're working like a charm.

问：结果
是否有任何其他原因比命名空间这样的行为？ ？你有任何提示，我可以看看

Question:
Are there any other reasons than the namespace for such behaviour? Do you have any hints where I can look at?

编辑：结果
的RTDeluxe.ascx.designer.cs文件存在，生成的 linkUl 是这样的：

protected global::System.Web.UI.HtmlControls.HtmlGenericControl linkUl;

EDIT2：结果
好吧，我会尽力回答你所有的问题。 ！感谢您的时间和反馈

Ok, I will try to answer all your questions. Thanks for your time and feedback!

1. 我已经重新启动Visual Studio中 - >问题依然存在

<华里。 >我也清理了解决方案，并部署一个新的。 - >问题仍然存在

2. 当我调试和检查控制层次结构，我可以看到标签是不存在的。


3. 当我改变标识的编译器代码隐藏抛出一个错误（这是正确的）。如果我更改ID有两个I和以前一样得到同样的behavoiur


4. 我也重新启动我的IIS和整个PC - >无变化

<华里。 >我添加了一个名称属性到linkul定义 - >任何更改

5. 当我尝试使用<$ C $。 C>的FindControl 则返回NULL。


6. 目标框架是.NET 3.5


7. 的linkul是不是里面中继器或任何其他控件。


8. 删除/修改web.config中也并不导致的解决方案。


9. 添加 EnsureChildControls 访问前的 linkUl 并没有改变任何东西。


10. 移动代码到Page_PreRender也并不工作。

1. I have restarted Visual Studio -> The Problem persists.
2. I also have cleaned up the solution and deployed a new one. -> The problem persists.
3. When I debug and check the control hierachy I can see that the label is NOT there.
4. When I change the ID the compiler throws an error in the code-behind (which is right). If i change the ID there two I get the same behavoiur as before.
5. I also restarted my IIS and the whole pc -> No changes.
6. I have added a Name attribute to the linkul-definition -> No changes.
7. When I try to use FindControl it returns NULL.
8. The target-framework is .NET 3.5
9. The linkul is NOT inside a repeater or any other controls.
10. Removing/changing the web.config does also not lead to a solution.
11. Adding EnsureChildControls before accessing the linkUl doesnt change anything.
12. Moving the code into Page_PreRender does also not work.

我会尝试一下你的建议未在此处列出，并很快加入他们。

I will try out your suggestions not listed here and add them soon.

EDIT3：结果
在这里充分的标记：

Here the full markup:

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>
<%@ Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="RTDeluxe.ascx.cs" Inherits="MainSolution.CONTROLTEMPLATES.Kunde.RTDeluxe" %>

<ul id="linkUl" class="teaserLinksUL" runat="server"/>

* Edit4：结果
确定这里一些额外的信息，我发现：
当我改变的东西在标记，如添加纯HTML文本它不认可，或在浏览器中显示。当我做这样的事情：

*
Ok here some additional info I found out: When I change something in the markup, like adding plain html text it's NOT recognized by or shown in the browser. When i do something like this:

   Label label1 = new Label();
   label1.Text = "hugo lives!";
   Controls.Add(label1);

据中。这似乎是在Visual Studio中，一切都很好......但活在代码隐藏说话有些怪异不同的标记服务器...

It is shown. It seems like in visual studio everything is fine... But "live" at the server the code-behind speaks to some weird different markup...

推荐答案

这可能会帮助你一点：

在代码隐藏在类级别的用户控制的文件中，添加以下代码：

On the code-behind file of the user-control at class level, add this code:

protected global::System.Web.UI.HtmlControls.HtmlGenericControl linkUl = new System.Web.UI.HtmlControls.HtmlGenericControl();

和删除保护全球:: System.Web.UI.HtmlControls。 HtmlGenericControl linkUl; 从 RTDeluxe.ascx.designer.cs 文件

这可能是因为其对象刚刚宣布不会创建。
希望这有助于..

It might be because its Object was just declared not created. Hope this helps..

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