Log4net does not write the log in the log file

Question

I have created a simple scenario using Log4net  but it seems that my log appenders do not work because the messages are not added to the log file  I added the following to the web config file   lt configSections gt       lt section name  quot log4net quot  type  quot log4net Config Log4NetConfigurationSectionHandler  log4net quot  requirePermission  quot false quot   gt           lt  configSections gt    lt log4net gt       lt appender name  quot LogFileAppender quot  type  quot log4net Appender FileAppender quot  gt               lt file value  quot D  MyData Desktop LogFile txt quot    gt               lt appendToFile value  quot true quot    gt               lt encoding value  quot utf-8 quot    gt               lt layout type  quot log4net Layout SimpleLayout quot    gt       lt  appender gt         lt root gt           lt level value  quot INFO quot    gt           lt appender-ref ref  quot LogFileAppender quot    gt       lt  root gt   lt  log4net gt   Within the global ASAX file I have added  ILog logger   LogManager GetLogger typeof MvcApplication     And within the Application Start method  logger Info  quot Starting the application    quot     Why the test log  quot Starting the application    quot  is not being added to the log file

User · Answer

Insert     assembly  log4net Config XmlConfigurator Watch   true     at the end of AssemblyInfo cs file

User · Answer

Use this FAQ page   Apache log4net Frequently Asked Questions  About 3 4 of the way down it tells you how to enable log4net debugging by using application tracing   This will tell you where your issue is   The basics are    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt       lt appSettings gt           lt add key  log4net Internal Debug  value  true   gt       lt  appSettings gt   lt  configuration gt    And you see the trace in the standard output

User · Answer

Make sure the following line code should be there in AssemblyInfo cs file    assembly  log4net Config XmlConfigurator ConfigFile    Web config   Watch   true    and also check for this line in Application start   method   log4net Config XmlConfigurator Configure

User · Answer

For me I had to move Logger to a Nuget Package  Below code need to be added in NuGet package project    assembly  log4net Config XmlConfigurator ConfigFile    log4net config      See https   gurunadhduvvuru wordpress com 2020 04 30 log4net-issues-when-moved-it-to-a-nuget-package  for more details

User · Answer

Do you call  log4net Config XmlConfigurator Configure      somewhere to make log4net read your configuration  E g  in Global asax   void Application Start object sender  EventArgs e            Code that runs on application startup         Initialize log4net      log4net Config XmlConfigurator Configure

User · Answer

Your config file seems correct  Then  you have to register your Log4net config file to application  So you can use below code         var logRepo   LogManager GetRepository Assembly GetEntryAssembly     XmlConfigurator Configure logRepo  new FileInfo  log4net config       After registering process  you can call below definition to call logger   private static readonly ILog log   LogManager GetLogger MethodBase GetCurrentMethod   DeclaringType    log Error  Sample log

User · Answer

In my case I had to give the IIS IUSRS Read write permission to the log file

User · Answer

There are a few ways to use log4net  I found it is useful while I was searching for a solution  The solution is described here  https   www hemelix com log4net

User · Answer

Make sure the process  account  that the site is running under has privileges to write to the output directory   In IIS 7 and above this is configured on the application pool and is normally the AppPool Identity  which will not normally have permission to write to all directories   Check your event logs  application and security  to see if any exceptions were thrown

User · Answer

In my case  log4net wasn t logging properly due to having a space in my project name  Drove me nuts why the same code worked just fine in a different project  but didn t in the new one  Spaces  A simple space   So  beware spaces in project names  I ve learned my lesson

User · Answer

For me I moved the location of the logfiles and it was only when I changed the name of the file to something else it started again   It seems if there is a logfile with the same name already existing  nothing happens   Afterwards I rename the old file and changed the log filename in the config back again to what it was

User · Answer

As  AndreasPaulsson suggested  we need to configure it  I am doing the configuration in AssemblyInfo file  I specify the configuration file name here      Log4Net Configuration   assembly  log4net Config XmlConfigurator ConfigFile    log4net config   Watch   true

User · Answer

Also  Make sure the  Copy always  option is selected for  log4net  config

[asp.net] Log4net does not write the log in the log file

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