c# - Log4net doesn't write to file -

i want add new log file.this appender:

<appender name="rollingfileappender" type="log4net.appender.rollingfileappender">   <file value="mylogfile.txt"/>   <appendtofile value="true"/>   <rollingstyle value="size"/>   <maxsizerollbackups value="5"/>   <maximumfilesize value="10mb"/>   <staticlogfilename value="true"/>   <filter type="log4net.filter.stringmatchfilter">     <stringtomatch value="test"/>   </filter>   <filter type="log4net.filter.stringmatchfilter">     <stringtomatch value="error"/>   </filter>   <filter type="log4net.filter.denyallfilter"/>   <layout type="log4net.layout.patternlayout">     <conversionpattern value="%date [%thread] %level %logger - %message%newline%exception"/>   </layout> </appender> <root>   <level value="all"/>   <appender-ref ref="rollingfileappender"/> </root> 

and on class add

[assembly: xmlconfigurator(watch = true)] 

and add access file but: log4net doesn't write file. why?

log4net fails silently when there's problem. design conceit no logging preferable taking down application. figure out what's wrong, turn on log4net's internal debugging adding key [app/web].config file:

<appsettings>   <add key="log4net.internal.debug" value="true"/> </appsettings> 

the debug messages written console or system.diagnostics.trace system. more details phill haack @ http://haacked.com/archive/2006/09/26/log4net_troubleshooting.aspx/

there number of reasons log4net might fail. permissions problems on log file directory, starters (especially true server processes, running under restricted set of permissions security).