log4net debug logs are not shown even if debug level is set to true

Question

I am using Microsoft.Extensions.Logging.Log4Net.AspNetCore in my ASP.NET Core 5.0 web application.

The logging is enabled in Startup.cs as this:

services.AddLogging(logging =>
{
    logging.AddLog4Net("log4net.config", true);
});

Unfortunately DEBUG Logs are not shown in the logfile / console even if I set the level to DEBUG?!

<log4net>
    <appender name="Console" type="log4net.Appender.ConsoleAppender">
        <layout type="log4net.Layout.PatternLayout">
            <!-- Pattern to output the caller's file name and line number -->
            <conversionPattern value="%date %5level %logger.%method [%line] - MESSAGE: %message%newline %exception" />
        </layout>
    </appender>
    <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
        <file value="log/WebApp.log" />
        <appendToFile value="true" />
        <maximumFileSize value="100KB" />
        <maxSizeRollBackups value="2" />
        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date %5level %logger.%method [%line] - MESSAGE: %message%newline %exception" />
        </layout>
    </appender>
    <appender name="TraceAppender" type="log4net.Appender.TraceAppender">
        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date %5level %logger.%method [%line] - MESSAGE: %message%newline %exception" />
        </layout>
    </appender>
    <appender name="ConsoleAppender" type="log4net.Appender.ManagedColoredConsoleAppender">
        <mapping>
            <level value="ERROR" />
            <foreColor value="Red" />
        </mapping>
        <mapping>
            <level value="WARN" />
            <foreColor value="Yellow" />
        </mapping>
        <mapping>
            <level value="DEBUG" />
            <foreColor value="White" />
        </mapping>
        <mapping>
            <level value="DEBUG" />
            <foreColor value="Green" />
        </mapping>
        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date %5level %logger.%method [%line] - MESSAGE: %message%newline %exception" />
        </layout>
    </appender>
    <root>
        <level value="ALL" />
        <appender-ref ref="RollingFile" />
        <appender-ref ref="TraceAppender" />
        <appender-ref ref="ConsoleAppender" />
    </root>
</log4net>

Answer 1

Configure logging for you HostBuilder. Tipicaly code in program.cs

public static IWebHostBuilder CreateWebHostBuilder(string[] args)
        {
            var HostBuilder = WebHost.CreateDefaultBuilder(args);
            
            HostBuilder
             

              .ConfigureLogging((hostingContext, logging) =>
              {
                  logging.AddLog4Net(Path.Combine(AppContext.BaseDirectory, "cfg", "log4net.config"));
                  logging.SetMinimumLevel(LogLevel.Debug);
              })
              .UseStartup<Startup>();
            return HostBuilder;
        }
    }