asp.net - load CSS file dynamically renders but doesn't load the CSS file

Question

in my ASP.NET app, I'm trying to add a CSS reference dynamically (with intelligent caching on the client).

My code renders to the browser correctly, but it doesn't load the CSS file. I have to put the link in my markup explicitly for the CSS file to load, but it won't load when in code behind

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        FileInfo fi = new FileInfo(Server.MapPath("~/Styles/Site.css"));
        HtmlGenericControl link = new HtmlGenericControl("LINK");
        link.Attributes.Add("rel", "stylesheet");
        link.Attributes.Add("type", "text/css");
        link.Attributes.Add("href", "~/Styles/Site.css?t=" + fi.CreationTime.Ticks.ToString());
        Page.Header.Controls.Add(link);
    }
}

This seems really simple. Not sure why it isn't working.

NOTE: the attending the fileinfo ticks has no effect on the behavior. It renders fine but doesn't load regardless of appending the file information.

tawman · Accepted Answer · 2011-10-06 16:13:37Z

2

You need to resolve the client URL for the stylesheet and then it will work:

link.Attributes.Add("href", ResolveClientUrl("~/Styles/Site.css?t=" + fi.CreationTime.Ticks));

answered Oct 6, 2011 at 16:13

tawman

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2 Comments

pearcewg Over a year ago

awesome! Thank you! I am curious though: the rendered code looks the same. Do you know why this makes a difference? Is it about the way ASP.NET/IIS loads the dynamic files like CSS files?

tawman Over a year ago

@pearcewg without the ResolveClientUtl() call it still has the ~/ in the markup <LINK rel="stylesheet" type="text/css" href="~/Styles/Site.css?t=634534960310240974"></LINK> whereas it's resolved otherwise <LINK rel="stylesheet" type="text/css" href="Styles/Site.css?t=634534960310240974"></LINK>

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