log4net log configuration in ASP.net Web Application

Steps for log4net log configuration in asp.net web application

1) Add log4net package from Manage NuGet Manager option on references right click menu.

2) Add this code in AssemblyInfo.cs file under properties in solution window.

// log4net to know and look for configuration
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Web.config", Watch = true)]

3) Add below config under "configuration" in web.config file.

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

4) Add this code under "configuration" in web.config file.

here file element is used to configure the application log file location.

<log4net debug="true">
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="D:\\TestProj\\TestLog.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>

5) Add this code under "configuration/appSettings" in web.config file.

    <add key="log4net.Internal.Debug" value="true" />

6) Add this code after system.web section under "configuration" in web.config.

here initializeData attribute is used in listeners to capture log4net data.

<system.diagnostics>
    <trace autoflush="true">
      <listeners>
        <add name="textWriterTraceListener"

           type="System.Diagnostics.TextWriterTraceListener"

           initializeData="D:\\TestProjlog4net.txt" />
      </listeners>
    </trace>
  </system.diagnostics>

7) Create log object using LogManager.GetLogger method under log4net namespace in class where need log operations.

using log4net;

private static readonly ILog log = LogManager.GetLogger(typeof(CustomerController).Name);

8) log object has info, Debug, Error methods to log the details for application.

log.Info("Employee information adding event: " + "ID: " + employee.Id.ToString() + ", Name: " + employee.Name);

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