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Posted 20 Dec 2012
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Simplest Implementation of log4net

, 21 Dec 2012
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Simplest implementation of log4net


log4net is a powerful logging framework for .NET. However most people go for their own implementation for logging framework to handle logs. I personally feel it's may be due to lack of simple implementation of sample with log4net.dll.

Using the Code

Simplest implementation of log4net:

Step 1: Create a Central Logging Class

public static class Logger
    private static log4net.ILog Log { get; set; }

    static Logger()
          Log = log4net.LogManager.GetLogger(typeof(Logger));

    public static void Error(object msg)

    public static void Error(object msg, Exception ex)
        Log.Error(msg, ex);

    public static void Error(Exception ex)
        Log.Error(ex.Message, ex);

    public static void Info(object msg)

Step 2: Update the AssemblyInfo.cs File in the Properties folder

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)] 

Step 3: Create a config named log4net.config (as specified in step 2)

<?xml version="1.0" encoding="utf-8" ?>
        <section name="log4net" 

         log4net" />

        <appender name="LogFileAppender" 

                        type="log4net.Appender.RollingFileAppender" >
            <param name="File" value="C:\Temp\Log\log.txt" />
            <param name="AppendToFile" value="true" />
            <rollingStyle value="Size" />
            <maxSizeRollBackups value="2" />
            <maximumFileSize value="10MB" />
            <staticLogFileName value="true" />
            <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
            <layout type="log4net.Layout.PatternLayout">
                  <param name="ConversionPattern" 

                       value="%-5p%d{yyyy-MM-dd hh:mm:ss} – %m%n" />

                       value="%newline%newline%date %newline%logger 
                       [%property{NDC}] %newline>> %message%newline" />

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

In this config file, have one appender only. Refer to Apache site for more config file samples.

Step 4: Done!!!!!

Step 5: Using it

Since all the logging methods exposed by Logger class are a static, we simply call them to do the logging, like:

    return 5/0;
catch (Exception ex)

Happy coding!!!


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

QuestionLog is not getting Created Pin
dheerajindian28-Jun-16 17:55
memberdheerajindian28-Jun-16 17:55 
QuestionLog is not writing on a file Pin
maheshmaddi26-Dec-13 22:46
membermaheshmaddi26-Dec-13 22:46 
AnswerRe: Log is not writing on a file Pin
RijuKK4-Feb-14 19:32
memberRijuKK4-Feb-14 19:32 
GeneralMy vote of 4 Pin
Klaus Luedenscheidt21-Dec-12 19:16
memberKlaus Luedenscheidt21-Dec-12 19:16 

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