Use CDN for ASP MVC Bundle with version tag

Question

I'd like to use CDN with my Bundles but ASP MVC doesn't handle version natively for CDN urls.

For instance :

public static void RegisterBundles(BundleCollection bundles) { bundles.UseCdn = true; //enable CDN support //add link to jquery on the CDN var jqueryCdnPath = "http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.min.js"; bundles.Add(new ScriptBundle("~/bundles/jquery", jqueryCdnPath).Include( "~/Scripts/jquery-{version}.js")); }

I can't use {version} tag Inside jqueryCdnPath, the Framewok has no way to know that I want the local version in the remote url. Is there a way to workaround this limitation ? How can I retrieve the local version to build the CDN url ?

Guillaume · Accepted Answer · 2014-12-03 08:26:26Z

I have an option but it only works when the {version} tag is used in virtualPath. Some scripts (bootstrap, globalize,...) doesn't need a version tag and I have no way to know the version number to reference on the CDN.

private static string GetLastIncludedVirtualPath(this Bundle bundle) { var files = bundle.EnumerateFiles(new BundleContext(new HttpContextWrapper(HttpContext.Current), new BundleCollection(), "")); var lastFile = files.LastOrDefault(); if (lastFile == null) throw new InvalidOperationException("You must include a file so version can be extracted"); return lastFile.IncludedVirtualPath; } public static Bundle IncludeWithVersionnedCdn(this Bundle bundle, string virtualPath, string cdnPath, params IItemTransform[] transforms) { if (bundle == null) throw new ArgumentNullException("bundle"); if (cdnPath == null) throw new ArgumentNullException("cdnPath"); bundle.Include(virtualPath, transforms); //GetVersion int lengthBeforeVersion = virtualPath.IndexOf("{version}", StringComparison.OrdinalIgnoreCase); if (lengthBeforeVersion == -1) throw new ArgumentException("Path must contains {version} when version argument is not specified", "virtualPath"); var includedPath = bundle.GetLastIncludedVirtualPath(); int lengthAfterVersion = virtualPath.Length - lengthBeforeVersion - "{version}".Length; string version = includedPath.Remove(includedPath.Length - lengthAfterVersion).Substring(lengthBeforeVersion); //Set CDN bundle.CdnPath = cdnPath.Replace("{version}", version); return bundle; }

Usage :

bundles.Add(new ScriptBundle("~/bundles/jquery") .IncludeWithVersionnedCdn( "~/Scripts/jquery-{version}.js", "//ajax.aspnetcdn.com/ajax/jQuery/jquery-{version}.min.js"));

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