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Asp.NET MVC BundleConfig: {version} string

One of the neat features inside the ASP.NET Optimization library is the support for a {version} string. Before you had to update your BundleConfig.cs each time that you upgraded one of your included JavaScript/CSS libraries.  The{version} placeholder tells the bundler to look for a string in the form of N[.N[.N]] and pick the file with the highest numbers.

You can see this feature in action by looking at the BundleConfig you get out-of-the-box when creating a new ASP.NET MVC application:

This will load the latest JQuery file that can be found inside my Scripts folder:

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You can do the same thing for Modernizr or any other library that uses the same versioning pattern.

There is only one thing missing in this feature; it only works when the version is part of the filename not of a folder. For example, when you use the Kendo UI libraries you’ll see that they don’t have a version number in every file but instead have the version number on the folder level.  Unfortunately this doesn’t work with the {version} number feature and you still have to update the references yourself:

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