c# – {version} wildcard in MVC4 Bundle

The Question :

157 people think this question is useful

In MVC 4 we have bundles. While defining the bundles we can use wildcards like * for all files in a folder.

In the example below what does -{version} mean?

public static void RegisterBundles(BundleCollection bundles)
{
    bundles.Add(new ScriptBundle("~/bundles/jquery").Include(
        "~/Scripts/jquery-{version}.js"));
}

The Question Comments :

The Answer 1

179 people think this answer is useful

The -{version} basically maps to a version regex, or to be precise: (\d+(?:\.\d+){1,3}).
Using * tends to grab too much, for example if you bundle jquery*, that will include jquery-ui as well which might mess up the ordering. But using jquery-{version}.js would let you avoid having to update your bundle definition every time you upgrade jquery.

Additional things to note:

  • {version} only works for the last part of the path–basically the file name–not a directory.
  • multiple version of jquery in the same folder will all get caught up.

The Answer 2

12 people think this answer is useful

This bundle is able to accomodate version numbers in script names. So updating jQuery to a new version in your application (via NuGet or manually) doesn’t require any code / markup changes.

See the following link for more information on bundling: http://weblogs.asp.net/jgalloway/archive/2012/08/16/asp-net-4-5-asp-net-mvc-4-asp-net-web-pages-2-and-visual-studio-2012-web-developer-features.aspx

The Answer 3

0 people think this answer is useful

~/Scripts/jquery-{version}.js is included in it. Here bundling system is smart enough to reference the highest version of jquery file when we specified {version} selector in the path. Also, this bundling system is smart enough to pick the minified version of the file, if available at the defined path.

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