Log4net usage record and log4net record

Log4net usage record and log4net record

1. Reference log4net. dll in the program

2. Add-create the configuration file Log4Net. config and select "always copy" in "Copy to output directory" in the file attributes. The file content is as follows:

<? Xml version = "1.0" encoding = "UTF-8"?> <Configuration> <! -- Log configuration --> <configSections> <section name = "log4net" type = "log4net. config. log4NetConfigurationSectionHandler, log4net "/> </configSections> <log4net> <root> </root> <! -- Only one logger is instantiated in the program and its name is LogHelper --> <logger name = "LogHelper"> <! -- Output ALL information. Only Info and Error are used here --> <level value = "ALL"/> <! -- Two media names, corresponding to errors and information --> <appender-ref = "ErrorRollingFileAppender"/> <appender-ref = "InfoRollingFileAppender"/> </logger> <! -- Info media settings --> <appender name = "InfoRollingFileAppender" type = "log4net. Appender. RollingFileAppender"> <! -- Defines the file storage location. Info and Error are stored in different folders, easy to understand --> <file value = "Log \ Info \"/> <appendToFile value = "true"/> <rollingStyle value = "Date"/> <datePattern value = "yyyyMMdd'.txt '"/> <staticLogFileName value = "false"/> <param name = "MaxSizeRollBackups" value = "100"/> <layout type = "log4net. layout. patternLayout "> <! -- Output format --> <! -- Example: record time: 14:03:00, 540 thread ID: [1] Log Level: ERROR content --> <conversionPattern value = "% newline % n record time: % date % n thread ID: [% thread] % n log level: %-5 level % n % m % n "/> </layout> <! -- Output level INFO --> <filter type = "log4net. filter. levelRangeFilter "> <param name =" LevelMin "value =" INFO "/> <param name =" LevelMax "value =" INFO "/> </filter> </appender> <! -- Error media settings --> <appender name = "ErrorRollingFileAppender" type = "log4net. Appender. RollingFileAppender"> <! -- Define the file storage location --> <file value = "Log \ Error \"/> <appendToFile value = "true"/> <rollingStyle value = "Date"/> <datePattern value = "yyyyMMdd'.txt '"/> <staticLogFileName value = "false"/> <param name = "MaxSizeRollBackups" value = "100"/> <layout type = "log4net. layout. patternLayout "> <! -- Output format --> <! -- Example: record time: 13:59:00, 560 thread ID: [1] Log Level: INFO Information Content --> <conversionPattern value = "% newline % n record time: % date % n thread ID: [% thread] % n log level: %-5 level % n % m % n "/> </layout> <! -- Set the output level ERROR --> <filter type = "log4net. filter. levelRangeFilter "> <param name =" LevelMin "value =" ERROR "/> <param name =" LevelMax "value =" ERROR "/> </filter> </appender> </log4net> </configuration>

3. Add code to AssemblyInfo. cs to call Log4Net. config:

[assembly: log4net.Config.XmlConfigurator(ConfigFile = "Log4Net.config", Watch = true)]

4. Implement LogHelper with the following code:

Public class LogHelper {private static log4net. ILog log = log4net. logManager. getLogger ("LogHelper "); /// <summary> /// sort the exception information /// </summary> /// <param name = "error"> </param> /// <returns> </returns> private static string Msg (Exception error) {string str = ""; if (error! = Null) {str = string. format ("exception type: {0} \ r \ n exception message: {1} \ r \ n exception information: {2} \ r \ n", error. getType (). name, error. message, error. stackTrace);} return str ;} /// <summary> /// output exception information /// </summary> /// <param name = "t"> </param> /// <param name = "ex"> </param> public static void LogError (Exception ex) {log. error (Msg (ex ));} /// <summary> /// output the log information /// </summary> /// <param name = "str"> </param> public static void LogInfo (string str) {log. info (str );}}

5. Now, you can easily use Log4Net to record information in the code.

Try {throw new Exception ("this is a new Exception");} catch (Exception ex) {LogHelper. logError (ex);} finally {LogHelper. logInfo ("this is Info ");}