I have a third party using a configuration file that looks like this:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
<!--Others sections-->
</configSections>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value=".\logs\logclient.txt" />
<appendToFile value="false" />
<rollingStyle value="Date" />
<maximumFileSize value="1000KB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%ndc] - %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFileAppender" />
</root>
</log4net>
</configuration>
The code in the third party looks like :
LogManager.GetRepository(Assembly.GetCallingAssembly()), configFile);
LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
I would like the third party dll to use my own appender defined in my own configuration file. How can I managed this ?
NB :
the third party need to use its own configuration file because others
sections are mandatory and I can not add them in my file
I can modify the third party configuration file, I can not modify mine
There are two existing questions that propose a solution to dynamically edit log4net configuration:
Dynamically reconfigure Log4Net
How can I change the file location programmatically? (see JackAce answer).
As far as I understand, you must use the third party configuration file and you can modify it.
The configSource property/attribute should work to redirect the log4net configuration section of your third party configuration file.
In the third party configuration file :
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net configSource="pathtoyourlog4net.config" />
log4net library is a tool to help the programmer output log statements
to a variety of output targets.
You can also configure log4net in code instead of using a config file,this SO post clearly explains the question.
Change appender dynamically:
public static void ChangeFilePath(string appenderName, string newFilename)
{
log4net.Repository.ILoggerRepository repository = log4net.LogManager.GetRepository();
foreach (log4net.Appender.IAppender appender in repository.GetAppenders())
{
if (appender.Name.CompareTo(appenderName) == 0 && appender is log4net.Appender.FileAppender)
{
log4net.Appender.FileAppender fileAppender = (log4net.Appender.FileAppender)appender;
fileAppender.File = System.IO.Path.Combine(fileAppender.File, newFilename);
fileAppender.ActivateOptions();
}
}
}
Reference post
If your .NET app is referencing the thirdparty.dll, at runtime the app will ignore the thirdparty.dll.config completely. Also, the thirdparty.dll will not pickup the settings in the thirdparty.dll.config as it is expecting these to be loaded by the exe.
What you have to do is to merge (or replicate) the content of the thirdparty.dll.config into your own app.config. Both your app and the thirdparty.dll will be able to pickup the settings in your app.exe.config and you only need to maintain one .config file.
Furthermore, you can then add additional appenders to the log4net section and it will be picked-up by both your app and the thirdparty.dll.
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;
I currently use a class library to store a class that handles logging using log4net. This class is used in other projects.
I've read a lot of other questions and answers, but I haven't been able to fix it yet...
I enabled internal debugging of log4net because it would not write to a file, and this is the error I get:
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" />
These are my files:
log4net.config
<log4net debug="true">
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<param name="File" value="Logs/log4net.log" />
<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 %m%n" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="LogFileAppender" />
</root>
</log4net>
App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
<parameter>
<parameterName value="#BlogId" />
<dbType value="Int32" />
<layout type="log4net.Layout.RawPropertyLayout">
<key value="BlogId" />
</layout>
</parameter>
</configuration>
AssemblyInfo.cs (just last line)
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)]
Logger.cs
public class Logger : ILogger
{
private static ILog logger = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
public Logger()
{
XmlConfigurator.Configure();
logger.Info("NEW LOGGER INSTANCE CREATED");
}
}
UPDATE
I fixed it by letting the class that uses my Logger.cs give its own .config file for log4net. Now log4net reads the given .config files and it works.
You have defined that the log4net section is in your app.config with:
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
that means you should add the content of the log4net.config to the app.config file.
If you're trying to implement a wrapper over log4net where the log4net lives in its own class library and not in the main executable of your application, try something like this in a static constructor of your wrapper class:
static Logger()
{
log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo
(System.IO.Path.GetDirectoryName
(System.Reflection.Assembly.GetExecutingAssembly().Location)));
}
The static constructor solution ensures that if you load the class library, the configuration code will run.
You will also need to do something to copy the log4net.config file from that class library project into the same folder as the executable. You can do this by hand when deploying the application; however, to do it automatically when debugging a post-build step with something like this (from the class library project) will put the config file into the right folder:
XCOPY "$(TargetDir)*.config" ".\..\..\..\..\bin\Debug" /S /Y /I
XCOPY "$(TargetDir)*.config" ".\..\..\..\..\bin\Release" /S /Y /I
// Where those paths point to the main executable /bin folders
// and build configuration target dirs
A good reason to use this approach is that if you're leveraging something like MEF, you can bring in your logger wrapper class as an interface and you don't need to reference log4net in more than one project in your solution. You can interface with the logger with an abstract interface of your own choosing, and use log4net as the Impl. (Bridge pattern)
Good luck!
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.
I want add new log to file.this is my 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 my class I add
[assembly: XmlConfigurator(Watch = true)]
and I add access everyone for the file but: log4net doesn't write to file. Why?
Log4net fails silently when there's a problem. The design conceit is that no logging is preferable to taking down the application. To figure out what's wrong, turn on Log4net's internal debugging by adding this key to your [app/web].config file:
<appSettings>
<add key="log4net.Internal.Debug" value="true"/>
</appSettings>
The debug messages will be written to the console or to the System.Diagnostics.Trace system. More details from Phill Haack at http://haacked.com/archive/2006/09/26/Log4Net_Troubleshooting.aspx/
There are any number of reasons Log4net might fail. Permissions problems on the log file directory, for starters (especially true for server processes, where your likely running under a restricted set of permissions for security).
You just need to call Configure:
log4net.Config.XmlConfigurator.Configure();
You can see more details here:
Log4net does not write the log file
You need to initialise the logging as the very first step in your app, and from the same assembly that you have the [assembly] tag:
From the docs:
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.
Add something like this in your start up code:
LogManager.GetLogger("Initialises logging from assembly attributes");
You should add this config section:
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
to refer the log4net configuration.
I'm not sure if this is the right forum to post this question. But I'm just hoping someone here might have used log4net in the past, so hoping to get some help.
I'm using log4net to log my exceptions. The configuration settings look like this:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net debug="false">
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:\Logs\sample.log" />
<appendToFile value="true"/>
<rollingStyle value="Size"/>
<maxSizeRollBackups value="10"/>
<maximumFileSize value="10MB"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date %logger.%method[line %line] - %message%newline"/>
</layout>
</appender>
<root>
<level value="INFO"/>
<appender-ref ref="RollingLogFileAppender"/>
</root>
</log4net>
</configuration>
I started out by adding this configuration to web.config, but I got an error (VS studio could not find a schema for log4net-"Could not find schema information for the element log4net"). So I followed this link (Log4Net "Could not find schema information" messages) and configured my settings in a separate xml file and added the following line of code in my AssemblyInfo.cs:
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "xmlfile.xml", Watch = true)]
And in the actual code, I placed this line:
public void CreateUser(String username, String password)
{
try
{
log.Info("Inside createuser");
//code for creating user
}
catch(exception e)
{
log.Info("something happened in create user", e);
}
}
The problem is that the log file is not being created. I can't see anything inside C:\Logs. Can anybody tell me what I'm doing wrong here?
Any suggestions/inputs will be very helpful.
Thank you all in advance.
I could not get the setting in Asembly.cs to work without adding this to Application_Start in my Global.asax:
log4net.Config.XmlConfigurator.Configure();
Your log file is not being created probably because the ASPNET user does not have permission to write to the C:\Logs\ directory. Make sure you give full rights to ASPNET to wherever your applicaton wants to create the log file.
So you are loading the configuration file but are you then setting the log variable like so
private static readonly ILog log = LogManager.GetLogger(typeof(Program));
Unless you specify a full path for the separate config file log4net expects the file to be in the path returned by:
System.AppDomain.CurrentDomain.BaseDirectory
If you have a simple console application, this usually means the directory containing the assembly but this is not necessarily true in other cases. There are many ways to solve this problem (c.f. my answer here as well).
To start it might be easier to put the log4net configuration back to the app/web.config and ignore the schema warning. If logging works then you can be sure you have no permission issues and can move to the next step to have the configuration in an external file.
What kind of application are you writing? Maybe I could be a bit more specific with my answer...