.NET Core 使用 log4net

Love The Way You Lie 2022-05-13 17:41 155阅读 0赞

### 1.安装log4net  ###

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

![70][]

### 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：

![70 1][]

### 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>
      
      <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>
    
        
        <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：

![70 2][]

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）。

[70]: /images/20220504/c049b2f1665949ef8df50187f9fedef3.png
[70 1]: /images/20220504/39f42f83cf9747a1b91d0a6f6ad1be09.png
[70 2]: /images/20220504/b43b6dca881e4785a4bae0e90cfac2b0.png