I've been shown how to use log4net and got a config file to use. I lost this config file and now I cant get it to work. For some reason the guy who configured it could not get it to work while having the configuration info in app.config so he placed it in log4net.config in the output folder.
He then called this when the program started up:
var logConfig = Path.Combine(Path.GetDirectoryName(typeof(App).Assembly.Location), "log4net.config");
var configStream = new FileInfo(logConfig);
log4net.Config.XmlConfigurator.Configure(configStream);
And it worked flawlessly.
Now I got it to work perfectly in a new console project. However allmost all of my projects are addons to another application so my project types are class libraries loaded by this other application (called Revit).
Anyway, so I know that I can log, but just cant get it to work...
This is log4net.config that I use:
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<file value="logs\" />
<datePattern value="dd.MM.yyyy'.log'" />
<staticLogFileName value="false" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="5MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="RollingFileAppender"/>
</root>
</log4net>
Each class that I want to log stuff from declares the an ILog instance on the class level.
Like this:
static private ILog _logger = LogManager.GetLogger(typeof(Program));
The ILog instance reports that all logging is enabled (debug and so on), but there are no files created.
Do I need to do anything else?
Im going nuts here!
Thanks for any help!
It seems you tried a few different ways to configure log4net. If one fails, the best option is to enable log4net debugging to see if your logger is working/crashed. In your app.config:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
...
<system.diagnostics>
<trace autoflush="true">
<listeners>
<add
name="textWriterTraceListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="C:\tmp\log4net.txt" />
</listeners>
</trace>
</system.diagnostics>
</configuration>
Log4net FAQ
In App.config file you should add this code in order to register the log4net section handler and the log will be generated
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
......
</configuration>
or Check if your AssemblyInfo.cs file has this code :
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4Net.config", Watch = true)]
Related
I am creating a logging component using log4net in my project. I've created an xml file to configure the log4net settings including an append-er and logger definition. I'm using PatternString to pick up properties' value from the appsetting.config file. However when I build and run the project, it throws the following error:
log4net:ERROR Undefined level [%property{Level}] on Logger [Test].
Does anyone know what might be causing it?
XML:
<?xml version="1.0" encoding="UTF-8" ?>
<log4net>
<logger name="Test">
<level type="log4net.Util.PatternString" value="%property{Level}" />
<appender-ref ref="JsonFileAppender" />
</logger>
</log4net>
appsetting.config:
<appSettings>
<add key="Level" value="ALL"/>
</appSettings>
In case it's useful the log4net version is: version:2.0.8
Good question!
I learnt from this, a lot.
Please don't forget to call this method before start logging.
log4net.Config.XmlConfigurator.Configure();
app.config is.
if you need apply pattern, use <layout> element.
and if you want to use some value from "appSettings",
use like this, %appSetting{Environment}
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender" >
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%ndc] - %message%newline" />
</layout>
</appender>
<root>
<level value="%appSetting{Environment}" />
<appender-ref ref="ConsoleAppender" />
</root>
</log4net>
<appSettings>
<add key="Environment" value="INFO" />
<!-- this is optional flag.-->
<add key="log4net.Internal.Debug" value="True" />
</appSettings>
</configuration>
Here is where I learned
Accessing appSettings config values from log4net config section
https://logging.apache.org/log4net/release/manual/configuration.html
https://www.paraesthesia.com/archive/2010/11/12/log4net-appsettings-keys.aspx/
The reason for this error is because the level of a logger can't be configured via a PatternString.
The <level> elements expects a wellknown value, like eg. ALL, DEBUG, INFO, WARN, ERROR,
eg.:
<logger name="Test">
<level value="All" />
</logger>
From your setup I read that you are trying to apply a setting from AppSettings.config upon the log level of a logger in your Log4net configuration.
As explained above, this can't be done.
Either keep all Log4net related settings within its own xml - in the end it is also configuration.
Or set the level programmatically;
you will have to translate the string value in appsettings.config to a Level yourself.
logger = LogManager.GetLogger("Test");
Level level = // Parse from ConfigurationManager.AppSettings["Level"]
((Logger)logger.Logger).Level = level;
The Story: I have a WinForms application with multiple assemblies - MainApp and Utilities. I use Utilities for my logging via log4net. All is fine with the world if I use a separate config file for log4net (aka log4net.config) - no issues.
However, IT staff finds it challenging to tweak two .config files (MainApp.exe.config and log4net.config). So, I'm trying to add my log4net config settings into my app.config file. Not having any luck.
I've tried several solutions posted in this forum. This one seemed to experience the same error I get:
log4net configuration - failed to find section
I've tried putting this line in my Utilities:AssemblyInfo.cs
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "MainApp.exe.config", Watch = false)]
In my Utilities module where log4net is referenced, I have this:
const string TEMP_VARIABLE = "TEMP";
string tempDir = Environment.GetEnvironmentVariable( TEMP_VARIABLE );
StringBuilder userTempDirLogFile = new StringBuilder( tempDir );
userTempDirLogFile.Append( #"\" );
userTempDirLogFile.Append( Environment.MachineName );
userTempDirLogFile.Append( "_MAIN_" );
userTempDirLogFile.Append( DateTime.Now.DayOfWeek );
userTempDirLogFile.Append( ".log" );
log4net.GlobalContext.Properties["MainLogFileName"] = userTempDirLogFile.ToString();
StringBuilder utilityLogFile = ( userTempDirLogFile.Replace( "_MAIN_", "_UTILITIES_" ) );
log4net.GlobalContext.Properties["UtilityLogFileName"] = utilityLogFile.ToString();
log4net.Config.XmlConfigurator.Configure();
_mainLogger = LogManager.GetLogger( "MAIN" );
_mainLogger gets this error message:
log4net:ERROR XmlConfigurator: Failed to find configuration section 'log4net' in the application's .config file. Check your .config file for the <log4net> and <configSections> elements. The configuration section should look like: <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
I noticed in log4net source code that log4net.Config.XmlConfigurator.Configure() calls Assembly.GetCallingAssembly(). I've verified that GetCallingAssembly() is indeed MainApp. My program directory contains all necessary files.
This is my app.config
<?xml version="1.0"?>
<configuration>
<!-- configSections MUST be first! -->
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net>
<appender name="MainLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{MainLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601} %property{messageId} %-5level %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<appender name="UtilityLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{UtilityLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601} %property{messageId} %-5level %message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<logger name="MAIN">
<level value="DEBUG" />
<appender-ref ref="MainLogFile" />
</logger>
<logger name="UTILITY">
<level value="DEBUG" />
<appender-ref ref="UtilityLogFile" />
</logger>
</log4net>
<startup>
<!-- Leave sku out so that both 4.0 and 4.5 are supported -->
<supportedRuntime version="v4.0" />
</startup>
<system.windows.forms jitDebugging="true" />
<system.diagnostics>
<trace useGlobalLock="false" />
</system.diagnostics>
<appSettings>
<add key="PRINT_CALL_STACK" value="false"/>
<add key="TRACK_PERFORMANCE" value="false"/>
<add key="USING_TEST_MODE" value="false"/>
<add key="WAIT_FOR_LOGON" value="0"/>
</appSettings>
</configuration>
I figure I'm missing something, but no clue as to what. Thanks for your time.
Note: using VS2013 and log4net 1.2.13.0. Solution targets .NET 4.0 full and x86.
If you want to put everything in your app.config, make sure you have this in the AssemblyInfo.cs:
[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]
true or false can be changed if you want to monitor dynamically or not the config file for changes.
and in your config file, make sure you have the appropriate sections. For example in mine I have:
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<param name="file" value="logs/App.log"/>
<param name="appendToFile" value="True"/>
<param name="encoding" value="utf-8"/>
<param name="staticLogFileName" value="False"/>
<param name="RollingStyle" value="Size"/>
<param name="MaxSizeRollBackups" value="1"/>
<param name="MaxFileSize" value="10485760"/>
<param name="threshold" value="Debug"/>
<layout type="log4net.Layout.PatternLayout">
<param value="%d [%t] %-5p %c{2} - %m%n" name="conversionPattern"/>
</layout>
</appender>
<root>
<level value="INFO" />
<appender-ref ref="FileAppender" />
</root>
</log4net>
If you put log4net configuration setting into the app.config or the web.config file the put into the AssemblyInfo.cs file in the Properties folder of your project the following line:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
Quote from the manual:
// Configure log4net using the .config file
[assembly: log4net.Config.XmlConfigurator(Watch=true)]
// This will cause log4net to look for a configuration file
// called TestApp.exe.config in the application base
// directory (i.e. the directory containing TestApp.exe)
// The config file will be watched for changes.
The assembly attribute must be in the MainApp project, not in the Utilities project.
As it says in the documentation for assembly attributes
Therefore if you use configuration attributes you must invoke log4net
to allow it to read the attributes. A simple call to
LogManager.GetLogger will cause the attributes on the calling assembly
to be read and processed. Therefore it is imperative to make a logging
call as early as possible during the application start-up, and
certainly before any external assemblies have been loaded and invoked.
I am using sharpdevelop to create a console application in C#. I have added in the reference for log4net and I added my logging statements while I was writing the code but I never looked at the log file. Now I am done with the code I need to get the log file working. My program runs fine, even the logging statements, but I can't find the log file.
I have tried to cobble together a couple of examples on getting log4net working. I have the lines to read from the configuration and then to instantiate the object, these are the first lines in my program to run:
log4net.Config.XmlConfigurator.Configure();
ILog datalogger = LogManager.GetLogger("myLog"); //initiate the data logger
Then in various places throughout the code I have this:
datalogger.Info(DateTime.Now.ToString() + ": using file: " + ProDirectory.ToString() + #"\" + myProFile.ToString());
I have also put the following in my app.config file:
<appender name="myLogAppender" type="log4net.Appender.RollingFileAppender" >
<file value="myLog.log" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %level - %message%n" />
</layout>
</appender>
<logger name="myLog">
<level value="All"></level>
<appender-ref ref="myLogAppender" />
</logger>
No matter what I do, I can't see the log file being produced. I have changed the directory and even paused the program to see if I could find a handle open to the log file. Each time I come up empty. Not sure what I could be doing wrong.
not sure if this will help. I also had hard times making log4net work in different scenarios.
I use log4net root xml node to specify the appender. hope it will help.
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="log.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="250KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFileAppender" />
</root>
UPDATE
You might also want to check Visual Studio output log. First setup the output log to log "ALL" (somewhere in VS settings). Then you should see exact error message of log4net in the output window of Visual Studio.
Whenever I have had issues with log4net creating the log file, it usually wound up being a file / directory permissions issue.
Change your <file value="log.txt" /> to something that you know will be accessible by the current user / process running devhost.
For example: <file value="%USERPROFILE%\Documents\log.txt" /> will create a log file in the user's My Documents folder. This is a folder that the user has permissions to write data to, and shouldn't give you any troubles with.
For more information on special folder values, see this link.
Looks like I just had to clean up my XML a little, after I did the log file is working fine:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections> <!-- Level 1 -->
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,
log4net"/> <!-- Level 2 -->
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
</startup>
<log4net>
<appender name="myLogAppender" type="log4net.Appender.RollingFileAppender" >
<file value="myLog.log" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %level - %message%n" />
</layout>
</appender>
<logger name="myLog">
<level value="All"></level>
<appender-ref ref="myLogAppender" />
</logger>
</log4net>
</configuration>
I'm having a problem logging to a text file using log4net dll.
I'm using vs 2012 express on a windows server 2008 r2 standard (64).
I have preform the following steps:
Open a new asp.net web forms
Install log4net via nuget manager.
in the global.asax file I have this in Application_Start :
log4net.Config.XmlConfigurator.Configure ();
In the web config I have added to the configSections node this line :
< section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
In the web config I have added this section :
<log4net debug="true">
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="c:\webSite\extraDownloadServerResources\Logs\ALU\log.txt" />
<appendToFile value="true" />
<rollingStyle value="Composite"/>
<datePattern value="yyyyMMdd" />
<maxSizeRollBackups value="5" />
<maximumFileSize value="5MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%n%-5p %d %5rms %-22.22c{1} %-18.18M %n - %m%n" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingLogFileAppender" />
</root>
</log4net>
In a start up page I have fetch instance of the logger :
private static readonly ILog log = LogManager.GetLogger ( System.Reflection.MethodBase.GetCurrentMethod ().DeclaringType );
In the Page_Load I have wrote this line :
log.Debug ( "test" );
I have add to the log.txt file security the Dedualt App Pool user with read/write permissions.
I have ended up with nothing in my log file.
To test the steps I did I have created a new empty web site and follow these steps one by one.
alas (I like this word) this time the log have been written to the file.
Can any one point me to a possible solution ?
To debug issues with log4net configuration you should enable log4net internal debugging.
Inside appSettings add log4net.Internal.Debug key as following:
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
This will enable log4net to output all messages to console and to the Trace. To forward all diagnostics messages to file you can add a trace listener:
<system.diagnostics>
<trace autoflush="true">
<listeners>
<add name="textWriterTraceListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="C:\tmp\log4net.txt" />
</listeners>
</trace>
</system.diagnostics>
These snippets were taken directly from the log4net FAQ and here only for quick reference.
This at least will give you understanding of what is going on as you will get error messages.
i have managed to solve my problem.
i have downloaded a tool to monitor all iss trafic.
When monitoring the traffic i saw the user name wasn't defaultAppPool nor AppPoolName.
it was ASP.NET v4.0.
After i granted the permissions and restarted everything , i finally saw some logs in the file...
So for some reason our logger has stopped logging and I am at a complete loss as to why.
What I'm using in my project is the following:
The log4net configuration:
<?xml version="1.0" encoding="utf-8"?>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="UdpAppender" />
<appender-ref ref="RollingFile" />
</root>
<appender name="UdpAppender" type="log4net.Appender.UdpAppender">
<remoteAddress value="127.0.0.1" />
<remotePort value="8180" />
<layout type="log4net.Layout.XmlLayoutSchemaLog4j">
<locationInfo value="true" />
</layout>
</appender>
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
<file value="Logs/DA.RA.log"/>
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<appendToFile value="true"/>
<maxSizeRollBackups value="10"/>
<maximumFileSize value="10MB"/>
<rollingStyle value="Size"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date %logger - %message%newline"/>
</layout>
</appender>
</log4net>
In my web.config I have the following line:
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=a3d255455d3dcb36"
requirePermission="false"/>
In my global.asax I have the following line in the application_start method:
string filename = Server.MapPath( #"~\XML\log4net.xml" );
log4net.Config.XmlConfigurator.ConfigureAndWatch( new System.IO.FileInfo( filename ) );
and when I call the logger in any of my pages I use:
private static readonly ILog logger = LogManager.GetLogger(typeof(ReportParameters));
I have tried many different things I found online. These include:
adding the following line to the assembly in my project
[assembly: log4net.Config.XmlConfigurator(Watch=true)]
I tried:
[assembly: log4net.Config.XmlConfigurator()]
I've upgraded the version of my log4net.dll from 1.2.10.0 to 1.2.11.0.
I tried adding the log4net appenders to the web.config file instead of in it's own file, and I still get nothing out of the logging.
Try opening internal debugging of log4net and check or share the result:
Note: I made a sample app and used your same log4net.xml file and ConfigureAndWatch statement and it worked without a problem. I think you are having a filename path resolution problem or permission to write problem. Create log folder If you didn't.
You need to add to web.config
<appSettings>
<add key="log4net.Internal.Debug" value="true" />
</appSettings>
<system.diagnostics>
<trace autoflush="true">
<listeners>
<add
name="textWriterTraceListener"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="c:\\inetpub\\wwwroot\\log4net.txt" />
</listeners>
</trace>
</system.diagnostics>
Other than a possible file permission issue, I have found that when using
[assembly: log4net.Config.XmlConfigurator()]
in ASP.NET projects, that it would never actually do anything (I was using the debug string appender).
The solution for me was to start up log4net within the Application_Start even in global.asax.
protected void Application_Start()
{
log4net.Config.XmlConfigurator.Configure();
}
Replace this:
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=a3d255455d3dcb36"
requirePermission="false"/>
For this:
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"
requirePermission="false"/>
And instead of
log4net.Config.XmlConfigurator.ConfigureAndWatch()
Call
log4net.Config.XmlConfigurator.Configure();
Let me know if it works that way