log4net - Getting Started
Note
Probably better to use the Microsoft - Logging Application Block: ../microsoft/patterns-and-practices.
Download
Download incubating-log4net-1.2.10.zip from
http://logging.apache.org/log4net/.
Install
The zip file contains different DLL’s for each version of .NET. Extract the
appropriate log4net.dll e.g:
bin\net\1.1\release\
bin\net\2.0\release\
Build
The log4net.dll file must be added as a reference to the project.
Note: If you make a copy of log4net.dll, don’t forget to copy
log4net.xml as well.
An MSBuild example: ../microsoft/msbuild.
Configuration
Assembly
In AssemblyInfo.cs, tell log4net to get its configuration from the
application .config file:
[assembly: log4net.Config.XmlConfigurator(Watch=true)]
Remove Watch=true is you don’t want the log4net system to watch the file
for runtime changes.
config
The application configuration file for ConsoleApp.exe is found in the
application root folder (i.e. the directory containing ConsoleApp.exe) and
will be called ConsoleApp.exe.config.
Note:
This is different for web applications: log4net - Web Application.
The .config file must be copied to the same folder as the exe or
dll.
For notes on how to do this… see Visual Studio - Tips - Build Events, ../microsoft/dev/visual-studio/tips.
A sample sample.exe.config file:
../../misc/howto/log4net/sample.exe.config
…another (more complicated sample):
../../misc/howto/log4net/ApplicationName.exe.config
To change the log level for a specific class:
<logger name="HelloWorld">
<level value="ALL" />
<appender-ref ref="RollingLogFileAppender" />
</logger>
Sample Code
A sample project: https://weezy/svn/development/sample/c-sharp/sample-log4net
To add logging to your class (not sure which of the next two is best):
public class HelloWorld
{
private static readonly log4net.ILog logger
= log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
public static void Main()
{
if (logger.IsErrorEnabled)
logger.Info("Application started");
}
}
or:
public class HelloWorld
{
private static log4net.ILog logger;
static HelloWorld()
{
logger = log4net.LogManager.GetLogger(typeof(HelloWorld));
}
Logging levels
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