Turn off ASP.NET Bundling based on "debug" query string

DebugBundlingAttribute.cs

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class DebugBundlingAttribute : ActionFilterAttribute
{
    private const string DEBUG_MODE_SESSION_KEY = "BundlingDebugMode";
        
    public bool PersistPerSession { get; set; }

    public DebugBundlingAttribute()
    {
        PersistPerSession = true;
    }

    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var session = filterContext.HttpContext.Session;
        var debugQueryString = filterContext.HttpContext.Request.QueryString["debug"];

        if (debugQueryString != null)
        {
            bool isUserRequestingDebug;
            bool.TryParse(debugQueryString, out isUserRequestingDebug);

            SetOptimizationEnabled(!isUserRequestingDebug);

            if (PersistPerSession && session != null)
            {
                session[DEBUG_MODE_SESSION_KEY] = isUserRequestingDebug;
            }
        }
        else
        {
            // user didn't supply a debug querystring but might have persisted a setting in sessions.
            if (PersistPerSession && session != null)
            {
                var sessionValue = session[DEBUG_MODE_SESSION_KEY];
                if (sessionValue != null)
                {
                    SetOptimizationEnabled(!(bool)sessionValue);
                }
            }
        }
    }

    private static void SetOptimizationEnabled(bool value)
    {
        var instance = ManagerProperty.GetValue(null, null);
        OptimizationEnabledProperty.SetValue(instance, value);
    }

    private static readonly PropertyInfo ManagerProperty = typeof(Scripts)
        .GetProperty("Manager", BindingFlags.Static | BindingFlags.NonPublic);

    private static readonly PropertyInfo OptimizationEnabledProperty = Assembly
        .GetAssembly(typeof(Scripts))
        .GetType("System.Web.Optimization.AssetManager")
        .GetProperty("OptimizationEnabled", BindingFlags.Instance | BindingFlags.NonPublic);
}

FilterConfig.cs

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new DebugBundlingAttribute());
    }
}