在C#中以编程方式添加元标记 [英] Adding meta tag programmatically in C#

问题描述

我正在尝试以编程方式添加<meta>.当.aspx页面中的Head元素带有runat = "server"时，它可以正常工作.

I'm trying to programmatically add a <meta>. It is working fine when there is a Head element with runat = "server" in the .aspx page.

后面的代码是:

HtmlMeta meta = new HtmlMeta();
meta.Name = "robots";
meta.Content = "noindex,follow";
this.Page.Header.Controls.Add(meta);

但是我的head标记中有一些脚本，其中包含<% ... %>之类的代码块，因此我无法保留runat = "server"的值.

But I have some script in the head tag which contains code blocks like <% ... %>, so I cannot keep the runat = "server" value.

问题是我必须以编程方式添加meta标记，因为它取决于数据库中的值.

The problem is I have to add the meta tag programmatically, because it depends on a value from the database.

有没有办法解决这个问题，以便我head元素中的脚本照常工作，并且可以通过编程方式添加meta标签?

Is there a way to solve this issue so that my script inside the head element works as usual and I can add a meta tag programmatically?

推荐答案

好，我测试了

OK, I tested the answer by veggerby, and it works perfectly:

在<header>部分:

<asp:PlaceHolder id="MetaPlaceHolder" runat="server" />

请注意，Visual Studio可能会在PlaceHolder标记上显示警告，因为它没有被识别为标头中的已知元素，但是您可以忽略它.可以.

Note that Visual Studio might show a warning on the PlaceHolder tag, because it is not recognised as a known element inside the header, but you can ignore this. It works.

在C#代码中:

HtmlMeta meta = new HtmlMeta();
meta.Name = "robots";
meta.Content = "noindex,follow";
MetaPlaceHolder.Controls.Add(meta);

或者(因为您已经在标头部分使用<% %>拥有代码块了)，所以您可以直接标记meta并仅从服务器端检索值:

Alternatively (since you already have code blocks using <% %> in your header section), you can tag the meta directly and retrieve only the value from server side:

<meta name="robots" content="<%=GetMetaRobotsValueFromDatabase()%>" />

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