.NET Core 使用 log4net

1.安装log4net 

    建立.NET Core工程 - 右键 - 管理NuGet程序包 - 搜索log4net - 安装。

2.日志输出到控制台

using log4net; using log4net.Config; using log4net.Repository; using System; namespace LogTest { class Program { static void Main(string[] args) { ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository"); BasicConfigurator.Configure(repository); ILog log = LogManager.GetLogger(repository.Name, "NETCorelog4net"); log.Info("NETCorelog4net log"); log.Error("error"); log.Warn("warn"); Console.ReadKey(); } } }

    运行结果：

  

3.日志输出到文件

    添加配置文件config.xml（右键 - 属性 - 复制到输出目录 - 始终复制），文件的内容如下：

<?xml version="1.0" encoding="utf-8" ?> <configuration> <!-- This section contains the log4net configuration settings --> <log4net> <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender"> <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" /> </appender> <appender name="FileAppender" type="log4net.Appender.FileAppender"> <file value="log-file.log" /> <appendToFile value="true" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" /> </layout> </appender> <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"> <file value="logfile/" /> <appendToFile value="true" /> <rollingStyle value="Composite" /> <staticLogFileName value="false" /> <datePattern value="yyyyMMdd'.log'" /> <maxSizeRollBackups value="10" /> <maximumFileSize value="1MB" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" /> </layout> </appender> <!-- Setup the root category, add the appenders and set the default level --> <root> <level value="ALL" /> <appender-ref ref="ConsoleAppender" /> <appender-ref ref="FileAppender" /> <appender-ref ref="RollingLogFileAppender" /> </root> </log4net> </configuration> using log4net; using log4net.Config; using log4net.Repository; using System; using System.IO; namespace LogTest { class Program { static void Main(string[] args) { ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository"); XmlConfigurator.Configure(repository, new FileInfo("config.xml")); ILog log = LogManager.GetLogger(repository.Name, "NETCorelog4net"); log.Info("NETCorelog4net log"); log.Error("error"); log.Warn("warn"); Console.ReadKey(); } } }

     控制台的输出如下：

     另外，生成一个文件夹logfile和一个以运行时的日期命名的文件20181025.log（配置文件中指定）。