从内容页面获取并转换 Masterpage UserControl 以访问特定的 UC 属性

Get and cast Masterpage UserControl from Content Page to access specific UC Property(从内容页面获取并转换 Masterpage UserControl 以访问特定的 UC 属性)

问题描述

我有一个引用 2 个用户控件的 MasterPage (MyBoxx.Master):

I have a MasterPage (MyBoxx.Master) referencing 2 usercontrols :

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MyBoxx.master.cs" Inherits="MyBoxxMaster" %>
<%@ Register TagPrefix="uc1" TagName="Header" Src="Header.ascx" %>
<%@ Register TagPrefix="uc1" TagName="Footer" Src="Footer.ascx" %>

我的用户控件标题"包含一个搜索框.我想在访问某些页面时隐藏此搜索框.因此，我在我的用户控件中添加了一个布尔属性，并在呈现用户控件时使用该属性来确定是否显示搜索框:

My user control "Header" contains among other things a searchbox. I want to hide this searchbox when visiting some pages. Therefore I added a boolean property to my user control and use this property when rendering the usercontrol to determinate whether to display the search box or not :

public partial class uxHeader : System.Web.UI.UserControl
{

    bool _showSearch = true;
    public bool ShowSearch
    {
        get { return _showSearch; }
        set { _showSearch = value; }
    }
    [...]
    protected void Page_Load(object sender, EventArgs e)
    {
        [...]
        searchBox.Visible = _showSearch;

    }
}

然后我尝试从内容页面访问此ShowSearch"属性:

I then try to access this "ShowSearch" Property from the content page :

((uxHeader)Page.Master.FindControl("Header1")).ShowSearch = false;

问题是我在尝试编译时收到以下错误:

Problem is I get the following error when trying to compile :

Error   15  The type or namespace name 'uxHeader' could not be found (are you missing a using directive or an assembly reference?)

问题是我确信我可以在某个时候让它工作和编译，因为它可以在以前发布的生产版本上工作.但是现在我正在对同一站点中的其他内容进行更改，并且无法再编译.

The thing is I'm sure I got it to work and compile at some point as it works on the previously released production version. But now I'm doing a change to something else in the same site, and can't compile anymore.

从 SO 上的各种帖子中，我尝试将以下行添加到我的内容页面 aspx 中:

From various post on SO, I tried adding the following lines to my content page aspx :

<%@ MasterType VirtualPath="~/MyBoxx.master"%>
<%@ Reference VirtualPath="~/MyBoxx.master" %>

没有任何成功！我还看到了一些关于页面生命周期的答案，但这不是问题，因为我在编译时遇到错误，而不是在执行时出现错误.

Without any success ! I saw also some answers about the page Lifecycle, but this can't be the problem here as I'm getting an error on compilation, not a bug upon execution.

如果有人对我如何永久解决此问题有任何建议，我将不胜感激.

If anyone has any advice on how I can fix this for good, I would grandly appreciate.

谢谢！

推荐答案

嗯，我找到了几个可行的解决方案……我想我更早地理解了它是如何/为什么起作用的

Well, I found several working solutions... and I think I understood how/why it worked earlier

1) 编译似乎在其中发挥了作用.如果我注释该行，编译站点，然后尝试再次添加该行，则 uxHeader 类型在 VS 中为可用"，我可以在未注释该行的情况下再次编译该站点...

1) it seems that compilation has a role to play in this. If I comment the line, compile the site, and then try to add the line again, the type uxHeader is "available" in VS and I can compile the site back again with the line uncommented...

2) 由于第一个解决方案显然不是长期解决方案，我发现在内容页面 aspx 中引用用户控件(当然没有实际使用它)可以解决问题:

2) As first solution is obviously not a long-term solution, I found that referencing the user-control (without actually using it of course) in the content page aspx would do the trick :

<%@ Register TagPrefix="uc1" TagName="Header" Src="Header.ascx" %>

3) 我也试过这个，我觉得最干净...在母版页中，公开一个公共属性:

3) I also tried this one, which I find the cleanest... In the master page, expose a public property :

public uxHeader PageHeader
{
    get
    {
        return Header1;//Header1 is the id of the userControl dropped in masterpage
    }
}

在内容页aspx中，我再放:

In the content page aspx, I then put :

<%@ MasterType VirtualPath="~/DBoxx.master"%>

然后，仍然在内容页面中，但在代码隐藏中，并且在网站编译后，我可以使用:

then, still in the content page, but in the codebehind, and after a compilation of the site, I can use :

this.Master.PageHeader.ShowSearch = false;

希望这将有助于那些在未来寻求有关该主题的帮助的人.我看到这是一个反复出现的问题

Hope this will help the ones searching for help on the subject in the future. I see this is a recurent question

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