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Adding meta tag programmatically in C#

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渐次进展 2020-12-14 01:24

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

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10条回答
  • 隐瞒了意图╮
    2020-12-14 01:46

    The best solution for this, which I successfully checked without any error or warning:

    The JavaScript code, which contains the <% ... %> code, was removed from the head section and placed in the body section.

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  • 生来不讨喜
    2020-12-14 01:52

    Many thanks to Awe for the solution! I have implemented this code in a (error404.ascx) ASP.NET User Control as follows:

    <%@ Control Language="C#"%>
<script runat="server">
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.TrySkipIisCustomErrors = true;  //Suppress IIS7 custom errors
        Response.StatusCode = 404;
        SetRobotsHeaderMetadata();
    }

    private void SetRobotsHeaderMetadata()
    {
        HtmlMeta meta = new HtmlMeta();
        meta.Name = "robots";
        meta.Content = "noindex,follow";
        this.Page.Master.FindControl("cphPageMetaData").Controls.Add(meta);
    }
</script>

    With the following masterpage:

    <%@ Master Language="C#" AutoEventWireup="true" Inherits="MyMaster" %>
<script runat="server">
    ...
</script>

<!DOCTYPE html>
<html lang="en-GB">
    <head>
        <title>Site title here</title>

        <asp:contentplaceholder runat="server" id="cphPageMetaData">
        </asp:contentplaceholder>
    </head>

    <body>
        ...
    </body>
</html>
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  • 死守一世寂寞
    2020-12-14 01:52

    I haven't tested it, but maybe you can add an <asp:Placeholder> inside the <head></head> tag and add the meta tags to this.

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  • 夕颜
    2020-12-14 01:55

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

    In the <header> section:

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

    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.

    In the C# code:

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

    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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