MVC4 – Bundling does not work when optimizations are set to true

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I imagine the problem is you putting the bundle at a virtual URL that actually exists, but is a directory.

MVC is making a virtual file from your bundle and serving it up from the path you specify as the bundle path.

The correct solution for that problem is to use a bundle path that does not directly map to an existing directory, and instead uses a virtual file name (that also does not map to a real file name) inside that directory.

Example:

If your site has a folder named /content/css, make your css bundle as follows:

In BundleConfig.cs:

bundles.Add(new StyleBundle("~/content/css/AllMyCss.css").Include(
                        "~/content/css/reset.css",
                        "~/content/css/bla.css"));

And on the page:

@Styles.Render("~/content/css/AllMyCss.css")

Note that this assumes you do NOT have a file named AllMyCss.css in your css folder.

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