如何让 Log4Net 使用 app.config
How to get Log4Net to use app.config
故事：我有一个包含多个程序集的 WinForms 应用程序 - MainApp 和 Utilities。我使用实用程序通过 log4net 进行日志记录。世界上一切都很好 if 我为 log4net 使用单独的配置文件（又名 log4net.config）- 没问题。
但是，IT 人员发现调整两个 .config 文件（MainApp.exe.config 和 log4net.config）具有挑战性。所以，我正在尝试将我的 log4net 配置设置添加到我的 app.config 文件中。运气不好。
我已经尝试了本论坛中发布的几种解决方案。这个似乎遇到了我得到的相同错误：
log4net configuration - failed to find section
我试过将此行放入我的 Utilities:AssemblyInfo.cs
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "MainApp.exe.config", Watch = false)]
在我引用 log4net 的实用程序模块中，我有这个：
const string TEMP_VARIABLE = "TEMP";
string tempDir = Environment.GetEnvironmentVariable( TEMP_VARIABLE );
StringBuilder userTempDirLogFile = new StringBuilder( tempDir );
userTempDirLogFile.Append( @"\" );
userTempDirLogFile.Append( Environment.MachineName );
userTempDirLogFile.Append( "_MAIN_" );
userTempDirLogFile.Append( DateTime.Now.DayOfWeek );
userTempDirLogFile.Append( ".log" );
log4net.GlobalContext.Properties["MainLogFileName"] = userTempDirLogFile.ToString();
StringBuilder utilityLogFile = ( userTempDirLogFile.Replace( "_MAIN_", "_UTILITIES_" ) );
log4net.GlobalContext.Properties["UtilityLogFileName"] = utilityLogFile.ToString();
log4net.Config.XmlConfigurator.Configure();
_mainLogger = LogManager.GetLogger( "MAIN" );
_mainLogger 收到此错误消息：
log4net:ERROR XmlConfigurator: 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" />
我在 log4net 源代码中注意到 log4net.Config.XmlConfigurator.Configure() 调用了 Assembly.GetCallingAssembly()。我已经验证 GetCallingAssembly() 确实是 MainApp。我的程序目录包含所有必需的文件。
这是我的app.config
<?xml version="1.0"?>
<configuration>
<!-- configSections MUST be first! -->
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net>
<appender name="MainLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{MainLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601}	%property{messageId}	%-5level	%message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<appender name="UtilityLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{UtilityLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601}	%property{messageId}	%-5level	%message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<logger name="MAIN">
<level value="DEBUG" />
<appender-ref ref="MainLogFile" />
</logger>
<logger name="UTILITY">
<level value="DEBUG" />
<appender-ref ref="UtilityLogFile" />
</logger>
</log4net>
<startup>
<!-- Leave sku out so that both 4.0 and 4.5 are supported -->
<supportedRuntime version="v4.0" />
</startup>
<system.windows.forms jitDebugging="true" />
<system.diagnostics>
<trace useGlobalLock="false" />
</system.diagnostics>
<appSettings>
<add key="PRINT_CALL_STACK" value="false"/>
<add key="TRACK_PERFORMANCE" value="false"/>
<add key="USING_TEST_MODE" value="false"/>
<add key="WAIT_FOR_LOGON" value="0"/>
</appSettings>
</configuration>
我想我遗漏了什么，但不知道是什么。感谢您的宝贵时间。
注意：使用VS2013和log4net 1.2.13.0。解决方案针对 .NET 4.0 full 和 x86。
程序集属性必须在 MainApp 项目中，而不是在 Utilities 项目中。
正如 documentation for assembly attributes
中所说
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.
如果你想把所有东西都放在你的 app.config 中，请确保你在 AssemblyInfo.cs:
中有这个
[assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]
true or false 可以更改，如果你想动态监控或不监控配置文件的变化。
并在您的配置文件中，确保您有适当的部分。例如在我的我有：
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<param name="file" value="logs/App.log"/>
<param name="appendToFile" value="True"/>
<param name="encoding" value="utf-8"/>
<param name="staticLogFileName" value="False"/>
<param name="RollingStyle" value="Size"/>
<param name="MaxSizeRollBackups" value="1"/>
<param name="MaxFileSize" value="10485760"/>
<param name="threshold" value="Debug"/>
<layout type="log4net.Layout.PatternLayout">
<param value="%d [%t] %-5p %c{2} - %m%n" name="conversionPattern"/>
</layout>
</appender>
<root>
<level value="INFO" />
<appender-ref ref="FileAppender" />
</root>
</log4net>
如果您将 log4net 配置设置放入 app.config 或 web.config 文件中，请将以下行放入项目 Properties 文件夹中的 AssemblyInfo.cs 文件中:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
引自manual：
// 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.
故事：我有一个包含多个程序集的 WinForms 应用程序 - MainApp 和 Utilities。我使用实用程序通过 log4net 进行日志记录。世界上一切都很好 if 我为 log4net 使用单独的配置文件（又名 log4net.config）- 没问题。
但是，IT 人员发现调整两个 .config 文件（MainApp.exe.config 和 log4net.config）具有挑战性。所以，我正在尝试将我的 log4net 配置设置添加到我的 app.config 文件中。运气不好。
我已经尝试了本论坛中发布的几种解决方案。这个似乎遇到了我得到的相同错误： log4net configuration - failed to find section
我试过将此行放入我的 Utilities:AssemblyInfo.cs
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "MainApp.exe.config", Watch = false)]
在我引用 log4net 的实用程序模块中，我有这个：
const string TEMP_VARIABLE = "TEMP";
string tempDir = Environment.GetEnvironmentVariable( TEMP_VARIABLE );
StringBuilder userTempDirLogFile = new StringBuilder( tempDir );
userTempDirLogFile.Append( @"\" );
userTempDirLogFile.Append( Environment.MachineName );
userTempDirLogFile.Append( "_MAIN_" );
userTempDirLogFile.Append( DateTime.Now.DayOfWeek );
userTempDirLogFile.Append( ".log" );
log4net.GlobalContext.Properties["MainLogFileName"] = userTempDirLogFile.ToString();
StringBuilder utilityLogFile = ( userTempDirLogFile.Replace( "_MAIN_", "_UTILITIES_" ) );
log4net.GlobalContext.Properties["UtilityLogFileName"] = utilityLogFile.ToString();
log4net.Config.XmlConfigurator.Configure();
_mainLogger = LogManager.GetLogger( "MAIN" );
_mainLogger 收到此错误消息：
log4net:ERROR XmlConfigurator: 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" />
我在 log4net 源代码中注意到 log4net.Config.XmlConfigurator.Configure() 调用了 Assembly.GetCallingAssembly()。我已经验证 GetCallingAssembly() 确实是 MainApp。我的程序目录包含所有必需的文件。
这是我的app.config
<?xml version="1.0"?>
<configuration>
<!-- configSections MUST be first! -->
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
</configSections>
<log4net>
<appender name="MainLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{MainLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601}	%property{messageId}	%-5level	%message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<appender name="UtilityLogFile" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="%property{UtilityLogFileName}"/>
<appendToFile value="false" />
<maximumFileSize value="20MB" />
<maxSizeRollBackups value="3" />
<param name="Encoding" value="unicodeFFFE" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ISO8601}	%property{messageId}	%-5level	%message%newline" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="OFF" />
</filter>
</appender>
<logger name="MAIN">
<level value="DEBUG" />
<appender-ref ref="MainLogFile" />
</logger>
<logger name="UTILITY">
<level value="DEBUG" />
<appender-ref ref="UtilityLogFile" />
</logger>
</log4net>
<startup>
<!-- Leave sku out so that both 4.0 and 4.5 are supported -->
<supportedRuntime version="v4.0" />
</startup>
<system.windows.forms jitDebugging="true" />
<system.diagnostics>
<trace useGlobalLock="false" />
</system.diagnostics>
<appSettings>
<add key="PRINT_CALL_STACK" value="false"/>
<add key="TRACK_PERFORMANCE" value="false"/>
<add key="USING_TEST_MODE" value="false"/>
<add key="WAIT_FOR_LOGON" value="0"/>
</appSettings>
</configuration>
我想我遗漏了什么，但不知道是什么。感谢您的宝贵时间。
注意：使用VS2013和log4net 1.2.13.0。解决方案针对 .NET 4.0 full 和 x86。
程序集属性必须在 MainApp 项目中，而不是在 Utilities 项目中。
正如 documentation for assembly attributes
中所说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.
如果你想把所有东西都放在你的 app.config 中，请确保你在 AssemblyInfo.cs:
中有这个 [assembly: log4net.Config.XmlConfigurator(ConfigFileExtension = "config", Watch = true)]
true or false 可以更改，如果你想动态监控或不监控配置文件的变化。
并在您的配置文件中，确保您有适当的部分。例如在我的我有：
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net>
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<param name="file" value="logs/App.log"/>
<param name="appendToFile" value="True"/>
<param name="encoding" value="utf-8"/>
<param name="staticLogFileName" value="False"/>
<param name="RollingStyle" value="Size"/>
<param name="MaxSizeRollBackups" value="1"/>
<param name="MaxFileSize" value="10485760"/>
<param name="threshold" value="Debug"/>
<layout type="log4net.Layout.PatternLayout">
<param value="%d [%t] %-5p %c{2} - %m%n" name="conversionPattern"/>
</layout>
</appender>
<root>
<level value="INFO" />
<appender-ref ref="FileAppender" />
</root>
</log4net>
如果您将 log4net 配置设置放入 app.config 或 web.config 文件中，请将以下行放入项目 Properties 文件夹中的 AssemblyInfo.cs 文件中:
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
引自manual：
// 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.