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In MVC 4 I can use @Styles.Render(“~/Content/css”) to called a bundle of CSS files defined BundleConfig file instead of calling the CSS directly.
When should we use bundle instead of calling directly the file?
I understand it clearly when we have various CSS files to simplify the code. But if there is a single CSS file, should we use a bundle or call it directly?
Combining multiple files is only one of the various interesting features of bundling.
For instance, bundles allow you to apply various transformations (e.g. LESS for CSS; Minification; Obfuscation for JS; etc).
Another nice feature is its built in caching mechanism. This ensures that clients will only retrieve a specific version of your bundle once. Any change to your bundle will be picked up by the client on the next request.
Bundles can also be used for run-time swapping of CSS or JS files. For instance, serving debug version of a JS framework on your development environment, while serving a minified version on your production environment. The switch can be made in your Global.asax.cs using any custom logic you like (e.g. Web.config parameter; compiler conditionals; etc)