Conditional compilation does not work

Question

Reading this post here on stackoverflow want to load a different css when compiling for release mode.

Code:

@{ #if (Debug) 
<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
#else
<link href="@Url.Content("~/Content/Site-min.css")" rel="stylesheet" type="text/css" />
#endif 
}

Attempt 2

@{ #if (Debug) }
<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
@{ #else }
<link href="@Url.Content("~/Content/Site-min.css")" rel="stylesheet" type="text/css" />
@{ #endif  }

I tried to DEBUG in uppercase But no change has no effect when compiling Debug to Release

Answer 1

According to this SO post, if you want this sort of thing to work, you can use a property in your Model to drive the View's conditional stuff, so the C# sets the Model's boolean (IsDebug, or whatever) via the compile time directive stuff and the View relies on that.

So your Model would end doing something like:

bool IsDebug = true;

#if (!DEBUG)
IsDebug = false;
#endif

and your View would do something like:

@if(Model.IsDebug) 
{ 
}
else
{
}

You could also use ViewBag/ViewData to hold that boolean value too, I suppose.

---

UPDATE:

Base on your comments, here's something you could do:

Create a new BaseController class which inherits from Controller.

public abstract class BaseController : Controller
{
   ...
   protected BaseController()
   {
      bool indebug = false;

      #if DEBUG
      indebug = true;
      #endif

      ViewBag.InDebug = indebug;
   }
}

and have your Controllers inherit from this rather than Controller.

Then in your _Layout.cshtml you could do this:

@if (ViewBag.InDebug)
{
}
else
{
}

This seems to work OK.