log4net log all unhandled application errors

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

Answers:

Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

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();

        }

    }

Method 2

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

Method 3

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.

Method 4

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.

Method 5

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.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0