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Questions tagged [log4net]

The Apache log4net library is a tool to help the programmer output log statements to a variety of output targets. log4net is a port of the excellent Apache log4j™ framework to the Microsoft® .NET runtime. We have kept the framework similar in spirit to the original log4j while taking advantage of new features in the .NET runtime.

Apache log4net is a tool to help the programmer output log statements to a variety of output targets. In case of problems with an application, it is helpful to enable logging so that the problem can be located. With log4net it is possible to enable logging at runtime without modifying the application binary. The log4net package is designed so that log statements can remain in shipped code without incurring a high performance cost. It follows that the speed of logging (or rather not logging) is crucial.

At the same time, log output can be so voluminous that it quickly becomes overwhelming. One of the distinctive features of log4net is the notion of hierarchical loggers. Using these loggers it is possible to selectively control which log statements are output at arbitrary granularity.

log4net is designed with two distinct goals in mind: speed and flexibility.

Features:

  • Support for multiple frameworks
  • Output to multiple logging targets
  • Hierarchical logging architecture
  • XML Configuration
  • Dynamic Configuration
  • Logging Context
  • Proven architecture
  • Modular and extensible design
  • High performance with flexibility

Support for multiple frameworks:

log4net runs on all ECMA CLI 1.0 compatible runtimes. log4net has specific builds for the following frameworks:

  • Microsoft® .NET Framework 1.0
  • Microsoft .NET Framework 1.1
  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 3.5
  • Microsoft .NET Framework 4.0
  • Microsoft .NET Framework 3.5 Client Profile
  • Microsoft .NET Framework 4.0 Client Profile
  • Microsoft .NET Compact Framework 1.0*
  • Microsoft .NET Compact Framework 2.0
  • Mono 1.0
  • Mono 2.0
  • Microsoft Shared Source CLI 1.0*
  • CLI 1.0 Compatible
  • Microsoft .NET Core 1.0 providing .NET Standard 1.3

The "Client Profile" builds are stripped down versions of the "normal" builds that don't contain any ASP.NET releated code - which for example means the %aspnet-* patterns and the AspNetTraceAppender are not available.

* Not supported by the binary release but can be built from the source release.

Official Website: http://logging.apache.org/log4net/

Useful Links:

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confusion on log4net capabilities, please help clarify?

My boss is asking me to develop a demo application that uses log4net for logging, and i set up the environment and did a simple logging, but now he is asking me to use log4net to search through the patterns that exist in several log files such us…
Precious
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Log4Net Dynamic logging folder path by exception

How can I configure logging folder path by specified exception using log4net ? I wanna specify logging folder at exception level, not at Appender level. Something like that : "_log.Error(exception, {LogFolder});"
pham cuong
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How to create log.txt using log4net?

I'm able to create logs but unable to write exception string to it...the logs.txt remains empty... This is the catch block : catch (Exception ex) { Logging.LogError(ex.ToString()); return new…
Syed Muhammad Yasir
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How to configure log4net for applications we are developing and running on our servers?

I would really apreciate if some one kindly clarify my confusion. I'm doing my internship in a company that develops and monitors prepaid reload systems in .NET framework and we are using C# currently, and i am required to research log4net and help…
Precious
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log4net file path using project Assembly info

I have the following in log4net.config that defines my logger:
BrianKE
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Is log4net AdoNetAppender thread-safe?

The Log4net FAQ says that log4net is thread-safe: Question: Is log4net thread-safe? Answer: Yes, log4net is thread-safe. However, the manual for the AdoNetAppender class says the following: Instance members are not guaranteed to be…
AWS User
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unable to set property on object using value with acceptable conversion type

I am using async forwarding appender. https://github.com/cjbhaines/Log4Net.Async Below is my Configuration
Esen
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Log to database with EF Code First

I would like to have log4net log to my database. I have added an AdoNetAppender as written in the docs . The docs also give the definition for the Log-table to create. Since I am using Entity Framework with Code First and I am recreating the…
peter
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Write raw text in log file using log4net

I have create the custom xml layout using this post. i need log message with character < but in log file it converted to < this is my code sample public class MyXmlLayout : XmlLayoutBase { protected override void FormatXml(XmlWriter writer,…
Mahendran
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Possible to set up Log4net Notification When it Crashes?

Log4net fails silently by design. Good. I don't want it taking down my app. Is there a way to set up a notification when Log4net crashes and stops logging? Is there some kind of event handler that I can hook into which will tell me that Log4net has…
onefootswill
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Including additional properties using PostSharp, Log4Net and Unity

I have a WCF application which uses Unity (3.5.1404) for DI via Unity.Wcf (3.5.1404) and PostSharp.Patterns.Diagnostics.Log4Net (4.1.14) with Log4Net (2.0.3) for logging via UnityLog4NetExtension (1.1). This all works exactly as expected and I get…
Shevek
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log4net.ext.json: ERROR Failed to find type [log4net.Layout.SerializedLayout, log4net.Ext.Json]

I've installed the nuget package for log4net.Ext.Json and following the first steps instructions from the wiki. However, I am getting the following error at runtime: log4net:ERROR Failed to find type [log4net.Layout.SerializedLayout,…
urig
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Log4net: Why is Pattern Layout ignored in RenderedMessage?

I'm debugging a custom log4net Appender that I've written. My setup uses this standard PatternLayout in my config file:
urig
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Log4net buffer size not working

im trying to enter every 100 records into the database.If i specify the buffer size as 100.It stills enters each record into the database.Is there a way where i can specify the flush interval and buffer size.So which comes first it takes that. This…
mithi sh
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LoggingEvent.ExceptionObject is null

I am currently attempting to write a custom appender for log4net. My Append method: protected override void Append(LoggingEvent loggingEvent) { ... stuff } I'd like to capture loggingEvent.ExceptionObject within the method. I can trigger the…
Nick Vaccaro
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