C# Tutorial for log4net

Here’s a short tutorial on how to use log4net in C#

1. Get log4net from the apache website.

2. Open your project with visual studio.

3. Add the reference to your project: You find the reference in the zip that you just downloaded: \bin\net\xxx\release\log4net.dll. xxx is your.net version.

4. Add the section to your app.config. The following code uses a file for the logging:

<configuration>
 <configSections>
 <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,Log4net"/>
 </configSections>
 <log4net>
 <root>
 <level value="DEBUG" />
 <appender-ref ref="LogFileAppender" />
 </root>
 <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender" >
 <param name="File" value="log-file.txt" />
 <param name="AppendToFile" value="true" />
 <rollingStyle value="Size" />
 <maxSizeRollBackups value="10" />
 <maximumFileSize value="10MB" />
 <staticLogFileName value="true" />
 <layout type="log4net.Layout.PatternLayout">
 <param name="ConversionPattern" value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
 </layout>
 </appender>
 </log4net>
</configuration>

5. Use the following code to use the configuration you just added to app.config:

static void Main
{
 log4net.Config.XmlConfigurator.Configure;
...

6. To log use the following code:

using log4net;
...
private static readonly ILog log = LogManager.GetLogger(typeof(Bar));
log.Debug("thishe first log message");
...

7. If Visual studio doesn’t recognize log4net. Configure your project like this:

Visual Studio -> project -> project name properties -> target framework ->.net Framework (not client)

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