使用NLog获取Application_Start()中的错误，并重定向到友好页面错误

我需要捕捉Application_Start（）中的任何错误并重定向到HTML错误页面，但如果我有错误，NLog不会记录任何内容，例如，数据库不可用：

private static Logger logger = LogManager.GetCurrentClassLogger();
protected void Application_Start()
{
    try
    {
        AreaRegistration.RegisterAllAreas();
        WebApiConfig.Register(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
        AutofacConfig.RegisterDependencies();
        AutoMapperConfiguration.Configure();
        AuthConfig.RegisterAuth();
        SimpleMemberShipConfig.SimpleMembershipInitializer();
        EntityFrameworkConfig.Configure();
    }
    catch (Exception e)
    {
        logger.Error(e);
    }
}

NLog配置：

<targets>
     <target xsi:type="File" name="Heelp_log" fileName="${basedir}/logs/Heelp-${shortdate}.log" layout="${longdate} ${uppercase:${level}} ${callsite:className=true:includeSourcePath=true:methodName=true} ${message}" />
</targets>
<rules>
     <logger name="*" minlevel="Error" writeTo="Heelp_log" />
</rules>

重定向我有：

<customErrors mode="On" defaultRedirect="~/Views/Shared/Error.html" />

但它会转到这样的页面（/Views/Shared/Error.html？aspxerrorpath=/）：

Server Error in '/' Application.
Runtime Error
Description: An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception. The request has been terminated. 

    protected void Application_Error()
    {
        var exception = Server.GetLastError();
        var httpException = exception as HttpException;
        Response.Clear();
        Server.ClearError();
        var routeData = new RouteData();
        routeData.Values["controller"] = "Error";
        routeData.Values["action"] = "General";            
        routeData.Values["exception"] = exception;
        Response.StatusCode = 500;
        if (httpException != null)
        {
            Response.StatusCode = httpException.GetHttpCode();
            switch (Response.StatusCode)
            {
                case 403:
                    routeData.Values["action"] = "Http403";
                    break;
                case 404:
                    routeData.Values["action"] = "Http404";
                    break;
            }
        }
        IController errorsController = new ErrorController();
        var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
        errorsController.Execute(rc);
    }

public class ErrorController : Controller
{   
    public ActionResult Index()
    {
        return View();
    }
    public ActionResult General()
    {            
        return RedirectToAction("Index", "Error");
    }
    public ActionResult Http404()
    {
        return View();
    }
    public ActionResult Http403()
    {
        return View();
    }
}