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;
Related
Is it possible to specify the logfile in the App.config?
I found these parameters in .NET:
https://github.com/paypal/sdk-core-dotnet/wiki/SDK-Configuration-Parameters
In PHP it seems to be possible (Logging):
https://github.com/paypal/sdk-core-php/wiki/Configuring-the-SDK
Now, the informations will be saved in the first of many stated logfiles.
Yes, it is possible to specify the logfile in your config. The PayPal .NET SDK wiki shows what information you need to add to your config file:
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<!-- log4net settings -->
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="my_app.log"/>
<appendToFile 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="FileAppender"/>
</root>
</log4net>
<!--
App-specific settings. Here we specify which PayPal logging classes are enabled.
PayPal.Log.Log4netLogger: Provides base log4net logging functionality
PayPal.Log.DiagnosticsLogger: Provides more thorough logging of system diagnostic information and tracing code execution
-->
<appSettings>
<!-- Diagnostics logging is only available in a Full Trust environment. -->
<!-- <add key="PayPalLogger" value="PayPal.Log.DiagnosticsLogger, PayPal.Log.Log4netLogger"/> -->
<add key="PayPalLogger" value="PayPal.Log.Log4netLogger"/>
</appSettings>
</configuration>
Replace my_app.log with your own logfile name.
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)]
I followed logging instructions given here:
I created a Assembly.cs that has this the following:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
This is my web.config file:
<configuration>
<configSections>
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="FileAppender"
type="log4net.Appender.FileAppender">
<file value="C:\Users\SOIS\Documents\Visual Studio 2010\WebSites\DummyPharmacy\logfile.txt" />
<appendToFile 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="FileAppender" />
</root>
</log4net>
</configuration>
My connection class where I use logger has this:
using log4net;
public class Connection
{
private static readonly ILog log = LogManager.GetLogger(typeof(Connection));
The debug shows execution of the logging. No file created in my folder though. What went wrong?
My output file has this:
log4net:ERROR 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 have made a separate log4net.config file. Because editing the existing one does not allow me to define a element.
This is because you didn't tell log4net to read config from your log4net.config file in your assembly attribute:
see the Configuration Attributes in official document:
// 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.
Change it to following should work:
[assembly: log4net.Config.XmlConfigurator(ConfigFile="log4net.config",Watch=true)]
Or if you prefer a single .config file, then keep the attribute and move the configruations from log4net.config to Web.config.
This is my first time ever using Log4Net so I'm sure I'm doing something really dumb.
In App.config, inside the <configuration> tag, I have the following:
<log4net>
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="log-file.txt" />
<param name="AppendToFile" value="true" />
<layout type="log4net.Layout.PatternLayout">
<param name="Header" value="[Header]\r\n" />
<param name="Footer" value="[Footer]\r\n" />
<param name="ConversionPattern" value="%d [%t] %-5p %c [%x] <%X{auth}> - %m%n" />
</layout>
</appender>
<root>
<level value="WARN" />
<appender-ref ref="LogFileAppender" />
</root>
</log4net>
In my Program.cs file I catch a ConfigurationException:
Message: Configuration system failed to initialize
InnerException: Unrecognized configuration section log4net.
But I copy-pasted the configuration code straight out of the .NET example they provide on their website. I read over their documentation but it's pretty confusing for someone who has never used any sort of logging framework before. I also found a few tutorials on CodeProject that hold your hand better but can't piece out what I've done wrong. I tried putting the <root> element before the <appender> element and that gives me the same ConfigException. And yes I've added a reference to the DLL to the project.
Sounds like you just forgot to include the configSection entry for log4net:
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<!-- other configurations, such as appSettings and whatnot -->
<log4net>
<!-- log4net configuration that you already have -->
</log4net>
</configuration>
In order to use the log4net config node the system needs to be told how to interpret that node, which is handled in the log4net.Config.Log4NetConfigurationSectionHandler class.
I am using Log4Net as the logging mechanism for an application of ours. Our configuration is contained in a config file and in our code we programatically invoke which of our several loggers (mostly using FileAppenders) we want to invoke. Recently I realized that one of our log files was not being populated, and I tracked it down to a string mismatch, between the name in our configuration file and the name we were programatically invoking in our code. Because the LogManager could not find the specified logger the root was returned, which for our config is not setup to meaningfully log anywhere.
My question is, is there a way to setup log4net to allow for using specific loggers, but that will fall back to a general logger if the specified logger is not found?
For example using a configuration file like this
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net>
<root>
<level value="ALL" />
<appender-ref ref="ConsoleAppender" />
</root>
<logger name="TestFileLogger">
<level value="ALL" />
<appender-ref ref="TestFileAppender" />
</logger>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%d [%t] %-5p [%x] - %m%n" />
</layout>
</appender>
<appender name="TestFileAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="TestLog" />
<param name="DatePattern" value=".yyyyMMdd".log"" />
<param name="AppendToFile" value="true" />
</appender>
</log4net>
</configuration>
And invoking the loggers in C# like this
var fileLogger = LogManager.GetLogger("TestFileLogger");
fileLogger.Info("This logs appropriately.");
var bogusLogger = LogManager.GetLogger("Bogus");
bogusLogger.Info("This should go to a general log. Bogus is not a recognized appender");
Is there a good way to log the messages from bogusLogger to some kind of general log file? My initial thought was to create a general file appender that is part of the root node, but this is very noisy as ALL log messages will be routed to this file. Is there a way to ONLY route messages that are not captured in another log file?
You could use LogManager.Exists("Bogus") to determine if the bogus-logger or your default implementation should be used.
You could create an extensionmethod on LogManager that could handle it for you.