log4net log all unhandled application errors

Question

Can you point me to some tutorial or samples on how I can log all un-handled exceptions that are occurring on my mvc web app using log4net. Thank you

You may or may not find this interesting (I'm not sure if it will work with log4net): ELMAH - http://code.google.com/p/elmah/ — Michael Maddox, Sep 02 '09 at 17:43
Thanks! I actually also hooked my app to Elmah while working on this problem and I really like the handy interface it has. I see my self using it more compared to log4 net for now but I will see how that goes with more experience.. — kaivalya, Sep 02 '09 at 19:14

score 53 · Accepted Answer · answered Sep 02 '09 at 19:12

53

I paste below the code I use on my global.asax that seems to satisfy me for now.. I am getting all unhandled exceptions on my log4net generated log files..

    public class MvcApplication : System.Web.HttpApplication
    {

        private static readonly ILog log = LogManager.GetLogger(typeof(MvcApplication));

        void Application_Error(Object sender, EventArgs e)
        {
            Exception ex = Server.GetLastError().GetBaseException();

            log.Error("App_Error", ex);
        }


        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default",
                "{controller}/{action}/{id}",
                new { controller = "Home", action = "Index", id = "" }
            );

        }

        protected void Application_Start()
        {
            RegisterRoutes(RouteTable.Routes);
            log4net.Config.XmlConfigurator.Configure();

        }

    }

answered Sep 02 '09 at 19:12

kaivalya

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2

You can also use an HttpModule to register the Error event handler: http://codebetter.com/blogs/karlseguin/archive/2006/06/12/146356.aspx – dahlbyk Sep 02 '09 at 19:22
1

You'll want to add `routes.IgnoreRoute("{*favicon}", new { favicon = @"(.*/)?favicon.ico(/.*)?" });` to your RegisterRoutes method if you don't have a favicon located within your site – Tr1stan Oct 27 '10 at 15:50
About HttpModule: the method to register the module detailed in the linked article applies to the old Classic IIS pipeline mode, not the (now recommended) integrated mode. See https://msdn.microsoft.com/library/ms227673(v=vs.100).aspx for details on how to register it if you use integrated mode. – personne3000 Nov 11 '15 at 03:23
So where do exceptions get logged to in this case? – Ortund Feb 19 '19 at 14:14

score 7 · Answer 2 · answered Apr 11 '13 at 16:41

For ASP.NET applications you like to use the System.Web.HttpApplication.Error event which is placed in Global.asax file.

protected void Application_Error(Object sender, EventArgs e)
{
    Exception ex = Server.GetLastError();

    // Stop error from displaying on the client browser
    Context.ClearError();

    logger.Fatal(ex.ToString);

}

watch Managing unhandled exceptions

score 2 · Answer 3 · answered Sep 02 '09 at 14:38

You might be interested to check out what Aspect Oriented Programming (AOP) is.

We accomplished this with Post sharp (only - we didn't use log4net but custom tracer).

Just check out first if log4net haven't something for this 'out-of-the-box'. I'm not sure about that.

score 2 · Answer 4 · answered Sep 02 '09 at 16:37

2

There is no built-in support for this in log4net. You should implement the Application_Error event in Global.asax and call your log4net logger there. The event will be triggered for all unhandled events in your app.

answered Sep 02 '09 at 16:37

Peter Lillevold

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score 1 · Answer 5 · answered Sep 02 '09 at 14:30

Without being facetious here you go.

        try
        {
            NotImplementedException nie = new NotImplementedException();
            throw nie;
        }
        catch (Exception e)
        {
            Log.Fatal(e);
        }

Assuming you are using .net 3.5, you could use extension methods, and extend System.Exception and add a Log(log4net.ILog log) method, then wherever you catch an exception in your app, assuming you've setup the Log instance correctly, then you easily do it. Your extension class could grow quite a bit, with various overloads for Debug, Info, Warn, Error and Fatal etc.

sorry my question was not clear - I need to log all unhandled exceptions — kaivalya, Sep 02 '09 at 14:34

log4net log all unhandled application errors

5 Answers5

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