Logging errors in ASP.NET MVC

I'm currently using log4net in my ASP.NET MVC application to log exceptions. The way I'm doing this is by having all my controllers inherit from a BaseController class. In the BaseController's OnActionExecuting event, I log any exceptions that may have occurred:

protected override void OnActionExecuted(ActionExecutedContext filterContext)
{
    // Log any exceptions
    ILog log = LogManager.GetLogger(filterContext.Controller.GetType());

    if (filterContext.Exception != null)
    {
        log.Error("Unhandled exception: " + filterContext.Exception.Message +
            ". Stack trace: " + filterContext.Exception.StackTrace, 
            filterContext.Exception);
    }
}

This works great if an unhandled exception occurred during a controller action.

As for 404 errors, I have a custom error set up in my web.config like so:

<customErrors mode="On">
    <error statusCode="404" redirect="~/page-not-found"/>
</customErrors>

And in the controller action that handles the "page-not-found" url, I log the original url being requested:

[AcceptVerbs(HttpVerbs.Get)]
public ActionResult PageNotFound()
{
    log.Warn("404 page not found - " + Utils.SafeString(Request.QueryString["aspxerrorpath"]));

    return View();
}

And this also works.

The problem that I'm having is how to log errors that are on the .aspx pages themselves. Let's say I have a compilation error on one of the pages or some inline code that will throw an exception:

<% ThisIsNotAValidFunction(); %>
<% throw new Exception("help!"); %>

It appears that the HandleError attribute is correctly rerouting this to my Error.aspx page in the Shared folder, but it is definitely not being caught by my BaseController's OnActionExecuted method. I was thinking I could maybe put the logging code on the Error.aspx page itself, but I'm unsure o