MVC4 StyleBundle: Can you add a cache-busting query string in Debug mode?

Question

I\'ve got an MVC application and I\'m using the StyleBundle class for rendering out CSS files like this:

bundles.Add(new StyleBundle(\"~/bundles         


        

Answer 1

Note this is written for Scripts but also works for Styles (just change those key words)

Building on @Johan's answer:

public static IHtmlString RenderBundle(this HtmlHelper htmlHelper, string path)
{
    var context = new BundleContext(htmlHelper.ViewContext.HttpContext, BundleTable.Bundles, string.Empty);
    var bundle = System.Web.Optimization.BundleTable.Bundles.GetBundleFor(path);
    var html = System.Web.Optimization.Scripts.Render(path).ToString();
    foreach (var item in bundle.EnumerateFiles(context))
    {
        if (!html.Contains(item.Name))
            continue;

        html = html.Replace(item.Name, item.Name + "?" + item.LastWriteTimeUtc.ToString("yyyyMMddHHmmss"));
    }

    return new HtmlString(html);
}

public static IHtmlString RenderStylesBundle(this HtmlHelper htmlHelper, string path)
{
    var context = new BundleContext(htmlHelper.ViewContext.HttpContext, BundleTable.Bundles, string.Empty);
    var bundle = System.Web.Optimization.BundleTable.Bundles.GetBundleFor(path);
    var html = System.Web.Optimization.Styles.Render(path).ToString();
    foreach (var item in bundle.EnumerateFiles(context))
    {
        if (!html.Contains(item.Name))
            continue;

        html = html.Replace(item.Name, item.Name + "?" + item.LastWriteTimeUtc.ToString("yyyyMMddHHmmss"));
    }

    return new HtmlString(html);
}

Usage:

@Html.RenderBundle("...")
@Html.RenderStylesBundle("...")

Replacing

@Scripts.Render("...")
@Styles.Render("...")

Benefits:

• Works for v1.0.0.0 of System.Web.Optimizations
• Works on multiple files in the bundle
• Gets the file modification date, rather than hashing, of each file, rather than a group

Also, when you need to quickly workaround Bundler:

public static MvcHtmlString ResolveUrl(this HtmlHelper htmlHelper, string url)
{
    var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext);
    var resolvedUrl = urlHelper.Content(url);

    if (resolvedUrl.ToLower().EndsWith(".js") || resolvedUrl.ToLower().EndsWith(".css"))
    {
        var localPath = HostingEnvironment.MapPath(resolvedUrl);
        var fileInfo = new FileInfo(localPath);
        resolvedUrl += "?" + fileInfo.LastWriteTimeUtc.ToString("yyyyMMddHHmmss");
    }

    return MvcHtmlString.Create(resolvedUrl);
}

Usage:

Replacing:

(Also replaces many other alternative lookups)