Log4Net Configuration in WPF

app.config

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,Log4net"/>
  </configSections>
  <log4net>
    <root>
      <level value="DEBUG"/>
      <appender-ref ref="SmtpAppender"/>
      <appender-ref ref="LogFileAppender"/>
      <appender-ref ref="ColoredConsoleAppender"/>
    </root>
    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="C:\tagfileuploader-log.txt"/>
      <param name="AppendToFile" value="true"/>
      <rollingStyle value="Size"/>
      <maxSizeRollBackups value="10"/>
      <maximumFileSize value="1MB"/>
      <staticLogFileName value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger: %message%newline"/>
      </layout>
    </appender>
    <appender name="ColoredConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger: %message%newline"/>
      </layout>
    </appender>
    <appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
      <to value="[email protected]"/>
      <from value="[email protected]"/>
      <subject value="TagFileUploader ERROR"/>
      <smtpHost value="prc-mn-ex01"/>
      <bufferSize value="512"/>
      <lossy value="true"/>
      <evaluator type="log4net.Core.LevelEvaluator">
        <threshold value="ERROR"/>
      </evaluator>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger: %message%newline"/>
      </layout>
    </appender>
  </log4net>

<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup></configuration>

App.xaml.cs

using System.Windows;
using log4net;

namespace Namespace
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        private static readonly ILog Log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        
        protected override void OnStartup(StartupEventArgs e)
        {
            log4net.Config.XmlConfigurator.Configure();
            //Log.Info("Hello World");
            base.OnStartup(e);
        }
    }
}

Thanks for this! I have a mental block around log4net.Config.XmlConfigurator.Configure();

For me the log is writing in to the file

Thanks for this.I got output.

The order is important, section should be before