Log4net logging not working - asp.net mvc

Solved by myself, reason was "for some reason" log4net configuration was not loaded from assembly info. Still I do not know why that happens.

I tried so many fixes proposed by different posts. Finally fixed the issue. Solution mentioned in this post helped me to solve the issue.

I have added following configuration,

    <!--These settings load the log4net configuration.-->
        <add key="log4net.Config" value="log4net.config"/>
        <add key="log4net.Config.Watch" value="True"/>

It starts logging!

Then I removed following line from assembly info,

// Configure log4net using the .config file 
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)]

The reason is that Log4Net tries to load the config from the assembly that first uses LogManager.GetLogger(). If it's one of your class libraries it will simply ignore the attribute in all other assemblies.

The easiest way to fix it is to invoke LogManager in your start file (like Program.cs or Global.asax):

var logger = LogManager.GetLogger(typeof(Program));
logger.Info("Application started.");

//rest of app init.

Doing that will get you the expected behavior with the assembly attribute.

I found log4net won't load the webconfig configuration unless you call log4net.Config.XmlConfigurator.Configure(); on start up.

    protected void Application_Start()
    {
        // your other codes

        log4net.Config.XmlConfigurator.Configure(); // must have this line
        Logger = log4net.LogManager.GetLogger(typeof(MvcApplication));

    }