I am new with log4net and I am getting problem with it.

I had referenced log4net.dll but when I write in my code :

using log4net; or in my Web.config

<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
 </configSections>

the compiler did not know that.

I am using .net framework 2.0 and log4net 1.2.10

Please help me with this problem.

Thanks in advance 

Hello.

In order to work with log4net, you need to:

1. Reference log4net.dll in your project

2. Add config handler as you already did, but because of changes in ASP.NET 2.0 security model, please do it like this:

<configSections>
    <section name="log4net" 
      type="log4net.Config.Log4NetConfigurationSectionHandler
      , log4net"     
      requirePermission="false"/>
</configSections>

3. Add log4net appender configuration:

  <log4net>
    <appender name="Console" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <!-- Pattern to output the caller's file name and line number -->
        <conversionPattern value="%5level [%thread] (%file:%line) - %message%newline" />
      </layout>
    </appender>
    <appender name="AspNetTraceAppender" type="log4net.Appender.AspNetTraceAppender" >
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
      <file value="LogFiles\file.log" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date %level %thread %logger - %message%newline" />
      </layout>
    </appender>
    <root>
      <level value="INFO" />
      <appender-ref ref="AspNetTraceAppender" />
      <appender-ref ref="Console" />
      <appender-ref ref="RollingFile" />
    </root>
  </log4net>

 4. Activate log4net in your application. Ideal place is Application_Start:

 
protected void Application_Start(Object sender, EventArgs e)
{
    log4net.Config.XmlConfigurator.Configure();
}
 

5.  Start using it :-)

Thanks Dejan Vesic so much, it is done.

But now I get a problem with external Log4Net.Config file. I want to create this file to write Log4Net configuration instead writting in Web.config.

My Web run normally but it did not write message into file log. 

This  is my Code :

1. Log4Net.Config file :

    <?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <appender name="FileAppender" type="log4net.Appender.FileAppender">
    <File value="c:/edex-log.txt" />
    <AppendToFile value="true" /> 
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%5p %d (%c:%L) - %m%n" />
    </layout>
  </appender>
  <root>
    <level value="INFO" />
    <appender-ref ref="FileAppender" />
  </root>
</log4net>

2. Code

    private static readonly ILog log = LogManager.GetLogger("Default");
    protected void Page_Load(object sender, EventArgs e)
    {           

        XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo("Log4Net.config"));
        log.Info("Entering application.");
    } 

 What's wrong with it.

Please help me solve this problem!

Thanks so much.

Phuc 

I believe that this is matter of relative path problem - you need to specify exactly where config file is.

Try this:

XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(Server.MapPath("~/Log4Net.config") ));  

You are right. 

Thank you very much!

And I have another problem in Log4Net even though I have Log4Net Document.

Please help me more understand TraceAppender attribute.

If I have only :

<?xml version="1.0" encoding="utf-8" ?> 

<log4net> 

<appender name="TraceAppender" type="log4net.Appender.TraceAppender" >
    <filter type="log4net.Filter.LevelRangeFilter">
      <acceptOnMatch value="true" />     
    </filter>
    <layout type="log4net.Layout.PatternLayout">
      <ConversionPattern value="%-5p - %m%n"/>
    </layout>
  </appender>

 <root>
    <levelMin value="INFO" />
    <levelMax value="FATAL" />
    <appender-ref ref="TraceAppender" />
  </root>
</log4net>

in my Config file.

Is it right or wrong!

Where is the Trace Info stored?

Thanks so much !

Phuc 

Well, there is no too much to say about TraceAppender It is using standard Trace class, for which you need to configure Listeners (look at article).

Personally, I do not use it, I am using Console / File and SMTP Appenders.

Another question, I hope I do not bother you much.

First, I thought ConsoleAppender is writting Log Info in Console App. When I tried to do that nothing happen.

Now I just understand about FileAppender and RollingLogFileAppender.

Could you tell me more about ConsoleAppender ?

Thanks for your support,

Phuc 

If you are writing Console application (or using Win32 API AllocConsole), that ConsoleAppender is for you.

If not (i.e. you have WinForms app or ASP.NET app), use other appenders, like FileAppender. 

You mean If I am in ASP.net, the ConsoleAppender is useless.

Exactly.

Stick with File or RollingFile appender + SMTP for ERROR/FATAL - best practice  

Thank you again!

Have a nice day.

Best Regards,

Phuc 

Awesome, wish I found this a long time ago. Trace appender works pretty well for me now.