c# - Using CDN in ASP.NET MVC bundles -

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i read article bundling , monification, specially using cdn, there things unclear me.

having example : 

public static void registerbundles(bundlecollection bundles) {     //bundles.add(new scriptbundle("~/bundles/jquery").include(     //            "~/scripts/jquery-{version}.js"));      bundles.usecdn = true;   //enable cdn support      //add link jquery on 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"));      // code removed clarity. }

  1. is there possibility use {version} format of cdn references, "local" ones?

  2. what point of including in bundles minified version of script, jquery-1.7.1.min.js? if not exist? should not search if .min file exist and/or generate respectively?

using system.web; using system.web.optimization;  namespace mvcapp {     public class bundleconfig     {         public static void registerbundles(bundlecollection bundles)         {             bundles.add(new scriptbundle("~/bundles/jquery", "https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js").include("~/scripts/jquery-{version}.js"));              bundles.add(new scriptbundle("~/bundles/bootstrap","https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js").include("~/scripts/bootstrap.js"));              bundles.add(new stylebundle("~/content/css", "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css").include("~/content/bootstrap.css"));              bundletable.enableoptimizations = true;             bundles.usecdn = true;         }     } }

what lot of developers don't realized there overload class constructor of scriptbundle , stylebundle, takes 2 string parameters, example scriptbundle scriptbundle(string, string) , stylebundle stylebundle(string, string). first parameter virtual path , second parameter cdnpath.

we might asking yourself, if takes 2 parameters, how mvc know 1 use? well, cdn location used when bundletable.enableoptimizations property set true.

setting enableoptimization property true tells mvc use use minified version of file instead of regular version.

when property set true, , cdn path present mvc use cdn path instead of local virtual path.
there 1 more property have set true , bundles.usecdn.
tells mvc use cdn location instead of local version. if bundletable.enableoptimization set false, the local version used automatically fall because cdn version minified version.

read blog clear think:

http://www.techjunkieblog.com/2015/06/aspnet-mvc-5-configure-bundleconfig.html


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