<layout type="log4net.Layout.PatternLayout">
<param name="Header" value=" -----------------------header-------------------------- " />
<param name="Footer" value="-----------------------footer-------------------------- " />
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] %X{auth} - Line:%L %m%n" />
</layout>
%m(message):输出的日志消息,如ILog.Debug(…)输出的一条消息
官方文档中有说明
http://logging.apache.org/log4net/release/sdk/log4net.Layout.PatternLayout.html