开启log4net内部调试

3种方法

• debug属性
• log4net.Internal.Debug application setting
• log4net.Util.LogLog.InternalDebugging属性

debug属性

log4net属性及含义：

实例：

<?  version=\"1.0\" encoding=\"utf-8\"?>
<configuration>
  <configSections>
    <section name=\"log4net\" type=\"log4net.Config.Log4NetConfigurationSectionHandler, log4net\" />
  </configSections>

 <log4net debug=\"true\">
    <root>
      <level value=\"ALL\" />
      <appender-ref ref=\"xxx\" />
    </root>
  </log4net>
</configuration>

log4net.Internal.Debug application setting

实例：

<?  version=\"1.0\" encoding=\"utf-8\" ?>
<configuration>
    <appSettings>
        <add key=\"log4net.Internal.Debug\" value=\"true\"/>
    </appSettings>
</configuration>

log4net.Util.LogLog.InternalDebugging属性

将log4net.Util.LogLog.InternalDebugging属性设置为true后，内部调试信息会写到控制台和System.Diagnostics.Trace。
实例：

<configuration>
    ...
    
    <system.diagnostics>
        <trace autoflush=\"true\">
            <listeners>
                <add 
                    name=\"textWriterTraceListener\" 
                    type=\"System.Diagnostics.TextWriterTraceListener\" 
                    initializeData=\"C:\\tmp\\log4net.txt\" />
            </listeners>
        </trace>
    </system.diagnostics>

    ...
</configuration>

Referal

• How do I enable log4net internal debugging?