Transforming multiple arguments in asp.net MVC CSS rewriteUrl

I've been attempting to utilize CssRewriteUrlTransform within one of my bundles in bundleconfig, however I'm consistently receiving a missing argument error. Here's what my code looks like:

bundles.Add(new StyleBundle("~/Content/GipStyleCss").Include(
       new CssRewriteUrlTransform(),
       "~/Content/GipStyles/all.css",
       "~/Content/GipStyles/normalize.css",
       "~/Content/GipStyles/reset.css",
       "~/Content/GipStyles/style.css",
));

I suspect that something is incorrect, but I'm unsure about where exactly to include the CssRewriteUrlTransform argument when there are multiple arguments in the include statement.

Answer №1

Attempting to combine both variations of the Include method is not possible:

public virtual Bundle Include(params string[] virtualPaths);
public virtual Bundle Include(string virtualPath, params IItemTransform[] transforms);

If you require the CssRewriteUrlTransform for each file, consider the following approach:

bundles.Add(new StyleBundle("~/Content/CustomStyle")
    .Include("~/Content/styles/custom1.css", new CssRewriteUrlTransform())
    .Include("~/Content/styles/custom2.css", new CssRewriteUrlTransform())
    .Include("~/Content/styles/custom3.css", new CssRewriteUrlTransform())
    .Include("~/Content/styles/custom4.css", new CssRewriteUrlTransform())
);

Answer №2

Encountering a similar scenario led me to develop a compact extension method:

public static class BundleExtensions {

    /// <summary>
    /// Utilizes the CssRewriteUrlTransform for each path in the array.
    /// </summary>      
    public static Bundle IncludeWithCssRewriteUrlTransform(this Bundle bundle, params string[] virtualPaths) {
        //To prevent 404 errors caused by relative paths in CSS files not reaching static files, we add CssRewriteUrlTransform.

        if ((virtualPaths != null) && (virtualPaths.Any())) {
            virtualPaths.ToList().ForEach(path => {
                bundle.Include(path, new CssRewriteUrlTransform());
            });
        }

        return bundle;
    }
}

You can utilize it in this manner:

        bundles.Add(new StyleBundle("~/bundles/foo").IncludeWithCssRewriteUrlTransform(
            "~/content/foo1.css",
            "~/content/foo2.css",
            "~/content/foo3.css"
        ));

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