How to Use log4net in ASP.NET MVC


Download code - https://github.com/codeandyou/Log4Net

Step 1 - Add log4net
"log4net.dll" library into your project.














Step 2 - Add Log4net setting in web.config

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<!-- Log4net section -->
      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
<log4net debug="true">
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="C:\\log.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="10MB" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n" />
      </layout>
    </appender>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
<!-- Log4net section -->
      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

<log4net debug="true">
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="C:\\log.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="10MB" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n" />
      </layout>
    </appender>
    <root>
      <level value="DEBUG" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>

Step 3 -  Add Log4net settings in Global.asax
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log4net.Config.XmlConfigurator.Configure();
log4net.Config.XmlConfigurator.Configure();

Step 4 - Log4net settings
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private static log4net.ILog Log { get; set; }
ILog log = log4net.LogManager.GetLogger(typeof(classtype));      //type of class
            log.Debug("Debug message");
            log.Warn("Warn message");
            log.Error("Error message");
            log.Fatal("Fatal message");
private static log4net.ILog Log { get; set; }


ILog log = log4net.LogManager.GetLogger(typeof(classtype));      //type of class


            log.Debug("Debug message");

            log.Warn("Warn message");

            log.Error("Error message");

            log.Fatal("Fatal message");

Step 5 - Run your project. And check that in c: drive log.txt file created and log entry done like this.







Note:
After done every step if you not able to see any log in c: drive. That means your application don't have administrator permission.

You can see such type of message - "ErrorCode: GenericFailure. Unable to acquire lock on file C:\log.txt. Access to the path 'C:\log.txt' is denied."

Now start your visual studio as administrator or create log.txt file into c: drive and give him administrator persmission.
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