使用log4net记录多个程序集

Question

After lots of issues, finally I managed to configure log4net for my window service.

I am pretty new to it and today I started configuring it. I have these below doubts.

1) I need to use that into multiple assemblies. Say I have an assembly 'A' which is added as reference in assembly 'B' which is mine main assembly where I have reference of log4net.I need to log both assembly 'A' and 'B'.

2) My application is multi-threaded and use lots of thread. So is log4net is thread safe?

3) I am using this below config in my app.config. I am not much aware what's the use of it. But I don't want to use unnecessary parameters.

<log4net>
     <root>
       <level value="DEBUG"/>
       <appender-ref ref="LogFileAppender"/>
     </root>
     <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
       <param name="File" value="C:\logs\log.txt"/>
       <param name="AppendToFile" value="true"/>
       <rollingStyle value="Size"/>
       <maxSizeRollBackups value="10"/>
       <maximumFileSize value="100KB"/>
       <staticLogFileName value="true"/>
       <layout type="log4net.Layout.PatternLayout">
         <param name="ConversionPattern" value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n"/>
       </layout>
     </appender>   
</log4net>

Answer 1

Use <lockingModel type="log4net.Appender.FileAppender+MinimalLock" /> under appender section. I twill increase the logging performance.

log4net is threadsafe.

<maximumFileSize value="10MB" /> //For 100 Kb configuration there will be lot of files.

<datePattern value="_yyyyMMdd" /> //It will hint the logger to create a new file per date.

Create a static class for Logger and call the static function from every assembly where you want to use.

Sample Class for logging:

public static class Logger
    {
        static Logger()
        {
            XmlConfigurator.Configure();
        }

        public static void Log()
        {
            string methodName = new System.Diagnostics.StackFrame(1, true).GetMethod().Name;
            string moduleName = new System.Diagnostics.StackFrame(1, true).GetMethod().ReflectedType.FullName;

            var appLog = LogManager.GetLogger(loggername);
            appLog.Error(...);

        }
    }

Answer 2

1. that's not a problem; just use ILog as usual in assembly B.
   just make sure you call Configure() once in your application's lifetime.
2. Yes.
3. I recommend familiarizing yourself with log4net. a simple google search or a look at the docs should do the trick.

Answer 3

 <root>
       <level value="DEBUG"/>
       <appender-ref ref="LogFileAppender"/>
     </root>

It will log only in debug mode, so make following entry in config:

 <root>
       <level value="ALL"/>
       <appender-ref ref="LogFileAppender"/>
     </root>