Log4net configuration from assembly attribute does not load configuration file

Question

I have the following file Log4net.config in my bin directory:

<?xml version="1.0" encoding="utf-8" ?> <log4net xmlns="urn:log4net">     <appender name="FileAppender" type="log4net.Appender.FileAppender">         <param name="file" value="MyLogFile.log"/>         <param name="appendToFile" value="false"/>         <layout type="log4net.Layout.PatternLayout">             <param name="ConversionPattern" value="%date (%logger) [%5level] - %message" />         </layout>     </appender>     <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">         <layout type="log4net.Layout.PatternLayout">             <param name="ConversionPattern" value="%date (%logger) [%5level] - %message" />         </layout>     </appender>     <root>         <level value="DEBUG" />         <appender-ref ref="FileAppender" />         <appender-ref ref="ConsoleAppender"/>     </root>     <logger name="NHibernate" additivity="false">         <level value="WARN"/>     </logger> </log4net> 

And the following code in my AssemblyInfo.cs file:

using System.Reflection; using System.Runtime.CompilerServices; using System.Runtime.InteropServices;  [assembly: AssemblyVersion("1.0.0.0")] [assembly: AssemblyTitle("My Project")] [assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4net.config", Watch = true)] 

When I run the program, I get the following log4net debug output:

log4net: log4net assembly [log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821]. Loaded from [D:\Data\Projects\Active\Clients\MyProject\src\MyProject.Importer\bin\Debug\log4net.dll]. (.NET Runtime [4.0.30319.1] on Microsoft Windows NT 6.1.7600.0) log4net: DefaultRepositorySelector: defaultRepositoryType [log4net.Repository.Hierarchy.Hierarchy] log4net: DefaultRepositorySelector: Creating repository for assembly [MyCompany.Framework, Version=2.1.72.0, Culture=neutral, PublicKeyToken=null] log4net: DefaultRepositorySelector: Assembly [MyCompany.Framework, Version=2.1.72.0, Culture=neutral, PublicKeyToken=null] Loaded From [D:\Data\Projects\Active\Clients\MyProject\src\MyProject.Importer\bin\Debug\MyCompany.Framework.dll] log4net: DefaultRepositorySelector: Assembly [MyCompany.Framework, Version=2.1.72.0, Culture=neutral, PublicKeyToken=null] does not have a RepositoryAttribute specified. log4net: DefaultRepositorySelector: Assembly [MyCompany.Framework, Version=2.1.72.0, Culture=neutral, PublicKeyToken=null] using repository [log4net-default-repository] and repository type [log4net.Repository.Hierarchy.Hierarchy] log4net: DefaultRepositorySelector: Creating repository [log4net-default-repository] using type [log4net.Repository.Hierarchy.Hierarchy] The thread 'vshost.RunParkingWindow' (0xd30) has exited with code 0 (0x0). The thread '<No Name>' (0x15d0) has exited with code 0 (0x0). log4net: Hierarchy: Shutdown called on Hierarchy [log4net-default-repository] 

Log4net loads, but doesn't seem to be processing my config file. When I comment out the attribute in AssemblyInfo.cs and run the following code during my program initialization, it works as expected:

var log4netConfig = "Log4net.config"; var log4netInfo = new FileInfo(log4netConfig); log4net.Config.XmlConfigurator.ConfigureAndWatch(log4netInfo); 

What am I doing wrong? I want to load from AssemblyInfo.cs.

Answer 1

I also have trouble with this method of boostrapping log4net. The documentation says you have to make a call very early in your application startup

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.

Try placing a logger in the same class that starts your application (program.cs, app.xaml, whatever). For example

private static readonly ILog Log = LogManager.GetLogger(typeof(Program)); 

And for kicks, make any call to the log (even one that is filtered or evaluated out of the append process, it should force log4net to evaluate your repository/heirarchy).

static Program() {     Log.Debug("Application loaded."); } 

Answer 2

finally i just find the simple solution, you may get help there

1. Global.asax in start function

    protected void Application_Start()  {    log4net.Config.XmlConfigurator.Configure();  } 

2. In any of the class where use logging at class level

add namespace

using log4net; 

add this code line at class level

private static readonly ILog log = LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType); 

3. use log function in any of the action call

   log.Error("test error q111.."); 

4. configuration

   <configuration> <configSections> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net " /> </configSection> <log4net debug="true">  <!--AdoNet appender is use for write log file into sql server--> <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">   <bufferSize value="1" />   <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />   <connectionString value="Data Source=DESKTOP-NLH31FH; Initial Catalog=SmallBizDb;Integrated Security=true" providerName="System.Data.SqlClient" />   <commandText value="INSERT INTO [dbo].[Logs] ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@logdate,@thread, @loglevel, @logger, @message, @exception)" />   <parameter>     <parameterName value="@logdate" />     <dbType value="DateTime" />     <layout type="log4net.Layout.RawTimeStampLayout" />   </parameter>   <parameter>     <parameterName value="@thread" />     <dbType value="String" />     <size value="255" />     <layout type="log4net.Layout.PatternLayout">       <conversionPattern value="%thread" />     </layout>   </parameter>   <parameter>     <parameterName value="@loglevel" />     <dbType value="String" />     <size value="50" />     <layout type="log4net.Layout.PatternLayout">       <conversionPattern value="%level" />     </layout>   </parameter>   <parameter>     <parameterName value="@logger" />     <dbType value="String" />     <size value="255" />     <layout type="log4net.Layout.PatternLayout">       <conversionPattern value="%logger" />     </layout>   </parameter>   <parameter>     <parameterName value="@message" />     <dbType value="String" />     <size value="4000" />     <layout type="log4net.Layout.PatternLayout">       <conversionPattern value="%message" />     </layout>   </parameter>   <parameter>     <parameterName value="@exception" />     <dbType value="String" />     <size value="2000" />     <layout type="log4net.Layout.ExceptionLayout" />   </parameter> </appender> <!--Add appender which you want to use, You can add more then one appender . Like if you want save log both plain text or sql server ,Add both appender.-->  <root>   <level value="Debug" />   <!--<appender-ref ref="RollingLogFileAppender" />-->   <!--Enable this line if you want write log file into plain text file-->   <appender-ref ref="AdoNetAppender" />   <!--Enable this line if you want write log file into sql server-->  </root>  </log4net>  <appSettings> <add key="log4net.Internal.Debug" value="true"/> </appSettings> </configuration> 

it may help all and easy to use. thanks