从内容页面获取并投射Masterpage UserControl，以访问特定的UC属性 [英] Get and cast Masterpage UserControl from Content Page to access specific UC Property

问题描述

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

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" %>

我的用户控件页眉"除其他外还包含一个搜索框.我想在访问某些页面时隐藏此搜索框.因此，我在用户控件中添加了一个布尔属性，并在呈现用户控件时确定是否显示搜索框时使用此属性:

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;

问题是尝试编译时出现以下错误:

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?)

事情是肯定的，因为它可以在以前发布的生产版本上运行，所以我可以在某个时候使它工作并进行编译.但是现在我正在对同一站点中的其他内容进行更改，并且无法编译了.

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.

在SO的各种文章中，我尝试将以下行添加到内容页面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" %>

没有成功！我也看到了有关页面生命周期的一些答案，但这不是问题，因为我在编译时遇到错误，而不是执行时遇到错误.

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

好吧，我找到了几个可行的解决方案...而且我想我知道它较早/为什么工作

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

1)似乎编译可以在其中发挥作用.如果我注释了这一行，编译了站点，然后尝试再次添加该行，则在VS中"uxHeader"类型为"available"，并且我可以重新编译该站点，而无需注释该行...

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)因为第一个解决方案显然不是长期解决方案，所以我发现在内容页面aspx中引用用户控件(当然实际上并没有实际使用它)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)我也尝试过这个，我发现它最干净... 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
    }
}

然后在内容页面aspx中，输入:

In the content page aspx, I then put :

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

然后，仍在内容页面中，但在代码背后，并且在对该站点进行编译之后，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;

希望这将对以后寻求有关此主题的帮助的人们有所帮助.我看到这是一个递归问题

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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