I really wish someone could help me with that. It is really driving me crazy.
I have a simple simple Windows Forms application and I am trying to use the log4net library for logging (I am just testing it in this project because it didn't work out in my main project).
So I have the regular Form1.cs, app.config, AssemblyInfo.cs and Program.cs.
In my app.config I have:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="LogFileAppender" />
</root>
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<header value="[Your Header text here]" />
<footer value="[Your Footer text here]" />
<conversionPattern value="%date [%thread] %-5level %logger [%ndc]
<%property{auth}> - %message%newline" />
</layout>
</appender>
</log4net>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>
In the Form1.cs:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using log4net;
using log4net.Config;
namespace log4net.test
{
public partial class Form1 : Form
{
private static readonly ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
log4net.Config.XmlConfigurator.Configure();
log.Debug("This is a DEBUG level message. The most VERBOSE level.");
log.Info("Extended information, with higher importance than the Debug call");
log.Warn("An unexpected but recoverable situation occurred");
}
}
}
And in the end of the AssemblyInfo.cs file I have added:
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "app.config", Watch = true)]
When I debug and go to the button1_Click I can see that nothing is happening. The log object has its:
IsInfoEnabled, IsDebugEnabled, IsErrorEnabled, IsWarnEnabled set to false and just nothing happens.
I've been trying to find a solution all day long and nothing. Can somebody help?
The problem is in this line:
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "app.config", Watch = true)]
At runtime, there is no file "app.config" in the bin directory. You must either specify the correct file name like this:
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "<your assembly name>.exe.config", Watch = true)]
or better just omit the name
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
I ran into a similar problem recently. If the logging does not work, I usually enable debug output as shown here: How to track down log4net problems
You need to set the root logging level in the configuration:
</appender>
<!-- Set root logger level to DEBUG and its only appender to A1 -->
<root>
<level value="DEBUG" />
<appender-ref ref="A1" />
</root>
</log4net>
You will also need to set the configuration section for log4net. Setting the configuration section allows log4net to read settings from the app.config See Below:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
/// Add this section before the log4net node
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<root>
<level value="DEBUG" />
<appender-ref ref="LogFileAppender" />
</root>
<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<header value="[Your Header text here]" />
<footer value="[Your Footer text here]" />
<conversionPattern value="%date [%thread] %-5level %logger [%ndc]
<%property{auth}> - %message%newline" />
</layout>
</appender>
</log4net>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
</configuration>
Related
I'm at my wits end, is it even possible to use log4net with an internet explorer browser helper object (BHO). I've tried just about everything I can find on the web and still no logfile.
My configuration is a separate log4net.config file and a bho that is designed to secure the browser for test takers. The log4net.config file is being picked up by the app and seems to be working, even to the point of an 'IsDebugEnabled' query. It seems to execute the write but nothing results.
My log4net.config
enter code here
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="c:\Logs\lockdown.txt" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<!--<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="DEBUG" />
<levelMax value="FATAL" />
</filter>-->
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%-5p %d %-22.22c{1} %-25.25M - %m%n" />
</layout>
</appender>
<root>
<level value="ALL"/>
<appender-ref ref="FileAppender" />
</root>
</log4net>
</configuration>
public BHO()
{
LoadLogging();
_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
if (_log.IsDebugEnabled)
_log.Debug("************** Browser session started *************");
}
public void LoadLogging()
{
Debugger.Launch();
if (!log4net.LogManager.GetRepository().Configured)
{
var codeBase = Assembly.GetExecutingAssembly().CodeBase;
var uri = new UriBuilder(codeBase);
var pathDataString = Uri.UnescapeDataString(uri.Path);
var path = Path.GetDirectoryName(pathDataString);
var configFile = new FileInfo(path + "\\log4net.config");
if (!configFile.Exists)
{
throw new FileLoadException($"The configuration file {configFile} does not exist.");
}
log4net.Config.XmlConfigurator.Configure(configFile);
}
}
Any help would be appreciated ...
Whilst it may be possible (but unlikely) that BHOs are blocked from writing to a file, I doubt it would be blocked from writing to the debug window.
Try configuring log4net to write to the debug window:
<log4net>
<root>
<level value="ALL" />
<appender-ref ref="DebugAppender"/>
</root>
<appender name="DebugAppender" type="log4net.Appender.DebugAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{dd.MM.yyyy HH:mm:ss.ffff} [%thread] %level %logger%exception - %message%newline" />
</layout>
</appender>
</log4net>
I have a C# application. I would like to integrate a log File. Then I try do this in App.config
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="logfile.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] – %message%newline" />
</layout>
</appender>
<appender name="InfoFileAppender" type="log4net.Appender.FileAppender">
<file value="info_logfile.txt" />
<appendToFile value="true" />
</appender>
<appender name="ErrorFileAppender" type="log4net.Appender.FileAppender">
<file value="error_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" />
<level value="INFO" />
<appender-ref ref="InfoFileAppender" />
<level value="ERROR" />
<appender-ref ref="ErrorFileAppender" />
</root>
</log4net>
So I try to write in infoFile:
log.Info("chiamata json");
but I don't see any text in info_logfile.txt
Where is my error?
Can we help me?
Reguards
Do you instantiate your log file? Try the following to see that it works with a console appender. (this example is copied from David Saltner)
using log4net;
using log4net.Config;
public class LogTest
{
private static readonly ILog logger =
LogManager.GetLogger(typeof(LogTest));
static void Main(string[] args)
{
BasicConfigurator.Configure();
logger.Debug("Here is a debug log.");
logger.Info("... and an Info log.");
logger.Warn("... and a warning.");
logger.Error("... and an error.");
logger.Fatal("... and a fatal error.");
}
}
.
private static readonly ILog logger =
LogManager.GetLogger(typeof(LogTest));
This creates a logger for the class LogTest. You don't have to use a different logger for each class you have, you can use different loggers for different sections or packages within your code. The class of the logger is output to the log so you know where any logged information has come from.
BasicConfigurator.Configure();
This method initializes the log4net system to use a simple Console appender. Using this allows us to quickly see how log4net works without having to set up different appenders.
This should get you started. Check out this great article for a brief introduction on how to set up appenders and more.
If the configuration is in your app.config file you need to add the sections in the config file:
<configSections>
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler, log4net, Version=1.2.10.0,
Culture=neutral, PublicKeyToken=1b44e1d426115821" />
</configSections>
It is better practice to configure your log4.net is a log4net.config file. Then you need to add the following line to your assembly which reads your configuration file:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
I have a console application and have a class library which wraps the Log4Net methods. Now when run the application in debug mode it writes log but when it is built in release mode it doesn’t write log file. What would be the solution for this? The sample code and config file is given below
My development environment is
Visual Studio 2013 and .NET Framework 4.5
Console Application
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
log4net.GlobalContext.Properties["LogFileName"] = "TestLogin.txt";
Logger log = new Logger(typeof(Program));
log.Info("Logging is enabled!!");
}
}
}
App.config in Console Application
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value ="%property{LogFileName}"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level - %message%newline%exception" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="RollingFileAppender" />
</root>
</log4net>
</configuration>
Class Library
using log4net;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace Logging
{
public class Logger
{
private readonly ILog log = null;
public Logger(Type type)
{
log = LogManager.GetLogger(type);
}
public void Info(object message)
{
log.Info(message);
}
}
}
I have followed the post and it didn’t help me to figure out why Log4Net doesn’t write in log file in release mode?
log4net doesn't log when running a .Net 4.0 Windows application built in Release mode
There are a few workarounds for this.
You could add the [MethodImpl(MethodImplOptions.NoInlining)]
attribute to your Logger constructor methods in your class library.
You could add [assembly: log4net.Config.XmlConfigurator(Watch =
true)] to AssemblyInfo.cs in your Console Project (not the class library project)
You can add log4net.Config.XmlConfigurator.Configure(); at the
start of your Logger constructor.
I think the reason this is happening is that in release mode, your class library is inlined and so when log4net attempts to find the attribute, it thinks the calling assembly is your exe which does not contain the attribute.
PS.
I presume you are aware that your Logger class will mean that you lose the ability to filter by method names, as log4net will only see the Logger.Info method name.
The line [assembly: log4net.Config.XmlConfigurator(Watch = true)] should be added to your AssemblyInfo.cs file in the Properties folder.
For users with an MVC app that already have the lines [assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)] in AssemblyInfo.cs and log4net.Config.XmlConfigurator.Configure(); in Global.asax.cs, but it's still not writing, make sure that the Application Pool user has permissions to write to the location where you're writing the log.
To get around this, I simply created a log directory on the IIS server NOT inside inetpub, gave it adequate permissions (I suppose it can be "Everyone", "Full Control" if it's just a child log directory and you're feeling lazy), and wrote the full path in the log4net.config (or Web.config, if you didn't isolate it).
Here's my config file:
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<root>
<level value="ALL"/>
<appender-ref ref="RollingFileAppender"/>
</root>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="C:/absolute/path/to/logfile.log" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maximumFileSize value="10MB"/>
<datePattern value="yyyyMMdd'-FULL.log'" />
<maxSizeRollBackups value="-1"/>
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
</log4net>
</configuration>
Make sure that the log4net.config file is added in your final release binary and corresponds to the path mentioned in ConfigFile = "log4Net.config".
I had the same problem, then I realized that I was simply missing out this config file in my release binary.
I have this in my Logging.dll and my Program.exe assembly.cs. Then it works in both debug and release mode. My program is a windows service.
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", Watch = true)]
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 attempting to use log4net. When I fire up the app it creates the log file, but no matter how many times I call Log.Info("Application Started"); it remains empty. I've researched the first two pages that google returns and my code seems to match all examples.
Code:
[assembly: XmlConfigurator(Watch = true)]
namespace Generator
{
public class Run
{
private static readonly log4net.ILog Log =
log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
public List<BILL_RUN> PerformBillRun()
{
XmlConfigurator.Configure();
Log.Info("Application Started");
var enabled = Log.IsInfoEnabled; //This is true
}
}
}
app.config
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="log-files.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<root>
<level value="All" />
<appender-ref ref="FileAppender" />
</root>
</log4net>
Any pointers as to what may be wrong?
This always happens to me...as soon as I post the question.
It turns out my <configSections></configSections> tags weren't directly a child to <configuration> meaning that the config wouldn't be picked up (I assume), and because log4net swallows all exceptions this only manifested itself further into my app.
Logging is working fine now.