Bundling not working in MVC5 when I turn on release mode

Question

I have the following bundle configured in BundleConfig.cs:

bundles.Add(new StyleBundle("~/bundles/css").Include(                       "~/assets/bootstrap/css/bootstrap.css",                       "~/assets/css/global/all.css")); 

and I reference it using the following:

@Styles.Render("~/bundles/css") 

When I'm in debug mode (web.config compilation debug="true") it works as expected in that it renders both css files as normal ie:

<link href="/assets/bootstrap/css/bootstrap.css" rel="stylesheet"/> <link href="/assets/css/global/all.css" rel="stylesheet"/> 

However when I set debug="false" the above behaviour still occurs in that it does recognise the files, however it's just rendering them as normal.

To confirm bundling can definitely work I've enabled optimizations in BundleConfig ie BundleTable.EnableOptimizations = true;

Whenever I do the above, it bundles the css and appears as expected ie:

<link href="/bundles/css?v=WBKHkZAJly7jUzHrVDT8SwfaQE-CA9dbOUQUlLKadNE1" rel="stylesheet"/> 

EDIT:

A few people have mentioned that adding the following code to my BundleConfig.cs file will achieve what I am after:

#if DEBUG             BundleTable.EnableOptimizations = false; #else             BundleTable.EnableOptimizations = true; #endif 

I understand and appreciate this response, however according to the documentation, the default behaviour of MVC bundling is to bundle in release mode but not in debug mode. I don't see why I should need to add extra code to make it do this when it should be doing it already.

EDIT 2

I've a confession to make. It turns out I had the web.config from the Views folder opened and not the main web.config. I changed the setting in the main web.config and this works just fine for me. I blame ReSharper

Answer 1

This is the default behavior.

Bundling and minification is enabled or disabled by setting the value of the debug attribute in the compilation Element in the Web.config file.

http://www.asp.net/mvc/overview/performance/bundling-and-minification

Answer 2

The way that I get around this is to force it in the BundleConfig to do exactly what I want it to do. I don't think MVC4 had the same options with the config file (or I just never got them to work).

So this is what I have at the end of my RegisterBundles method:

#if DEBUG BundleTable.EnableOptimizations = false; #else BundleTable.EnableOptimizations = true; #endif 

This way it's always there, plain to see. However, you do have to remember to put that in there when you're starting up the project, but that's not a huge deal.

If you're not familiar with these, the #if DEBUG is a preprocessor directives that tells the CLR to do what is in that block when the DEBUG build parameter is present (should only be present in DEBUG mode, though that can be changed from the Project Properties). If that variable is not present (Release mode, or any other mode), then it will do the other block.