asp.net-mvc – MVC 5捆绑和Azure CDN(查询字符串)

问题是,一旦为StyleBundles或ScriptBundles重写查询字符串,一年的默认缓存行为将重置为no-cache.这可以通过重新生成MVC框架在指定每个Bundle的CDNPath时使用的每个bundle完全相同的查询字符串来解决.

以下是使用MVC Web App模板完成的工作.这是BundleConfig类：

public class BundleConfig
    {
        public static void RegisterBundles(BundleCollection bundles)
        {            
            //we have to go ahead and add our Bundles as if there is no CDN involved.
            //this is because the bundle has to already exist in the BundleCollection
            //in order to get the hash that the MVC framework will generate for the
            //querystring. 
            Bundle jsBundle = new ScriptBundle("~/scripts/js3").Include(
                 "~/Scripts/jquery-{version}.js","~/Scripts/modernizr-*","~/Scripts/bootstrap.js","~/Scripts/respond.js");
            bundles.Add(jsBundle);

            Bundle cssBundle = new StyleBundle("~/content/css3").Include(
                      "~/Content/bootstrap.css","~/Content/site.css");
            bundles.Add(cssBundle);

#if Debug
            bundles.UseCdn = false; 
#else
            bundles.UseCdn = true;
            //grab our base CDN hostname from web.config...
            string cdnHost = ConfigurationManager.AppSettings["CDNHostName"];

            //get the hashes that the MVC framework will use per bundle for 
            //the querystring. 
            string jsHash = GetBundleHash(bundles,"~/scripts/js3");
            string cssHash = GetBundleHash(bundles,"~/content/css3");

            //set up our querystring per bundle for the CDN path. 
            jsBundle.CdnPath = cdnHost + "/scripts/js3?v=" + jsHash;
            cssBundle.CdnPath = cdnHost + "/content/css3?v=" + cssHash;
#endif
        }

        //Frison B Alexander's code:
        private static string GetBundleHash(BundleCollection bundles,string bundlePath)
        {

            //Need the context to generate response
            var bundleContext = new BundleContext(new HttpContextWrapper(HttpContext.Current),BundleTable.Bundles,bundlePath);

            //Bundle class has the method we need to get a BundleResponse
            Bundle bundle = BundleTable.Bundles.GetBundleFor(bundlePath);
            var bundleResponse = bundle.GenerateBundleResponse(bundleContext);

            //BundleResponse has the method we need to call,but its marked as
            //internal and therefor is not available for public consumption.
            //To bypass this,reflect on it and manually invoke the method
            var bundleReflection = bundleResponse.GetType();

            var method = bundleReflection.GetMethod("GetContentHashCode",System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);

            //contentHash is whats appended to your url (url?###-###...)
            var contentHash = method.Invoke(bundleResponse,null);
            return contentHash.ToString(); 
        }
    }