example of a chained bundle transform using less

chainedBundleTransform.cs

protected void Application_Start()
{
   //...

   Bundle cssBundle = new Bundle("~/Content/css", new LessTransform().Then(new CssMinify()));
   cssBundle.AddFile("~/Content/site.css", throwIfNotExist: false);
   cssBundle.AddDirectory("~/Content/", "jquery.mobile*", searchSubdirectories: false, throwIfNotExist: false);
   BundleTable.Bundles.Add(cssBundle);

   //...
}

public class LessTransform : IBundleTransform
{
    public void Process(BundleContext context, BundleResponse response)
    {
        response.Content = Less.Parse(response.Content);
        response.ContentType = "text/css";
    }
}

public static class BundleTransformExtensions {
    public static IBundleTransform Then(this IBundleTransform source, IBundleTransform add)
    {
        return new ChainedBundle(source, add);
    }
}

public class ChainedBundle : IBundleTransform
{
    IBundleTransform _source;
    IBundleTransform _add;

    public ChainedBundle(IBundleTransform source, IBundleTransform add)
    {
        _source = source;
        _add = add;
    }

    public void Process(BundleContext context, BundleResponse response)
    {
        _source.Process(context, response);
        _add.Process(context, response);
    }
}