NetCore使用Log4Net记录日志

Core使用Log4Net输出日志

• 1.创建Core项目

• 2.用Nuget下载引用log4net 和 Microsoft.Extensions.Logging.Log4Net.AspNetCore 文件

• 3.添加log4net.Config配置文件

在工程目录下添加log4net.config配置文件

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
  <root>
    <level value="All" />
    <appender-ref ref="ErrorRollingFileAppender" />
    <appender-ref ref="WarnRollingFileAppender" />
    <appender-ref ref="InfoRollingFileAppender" />
  </root>

  <appender name="ErrorRollingFileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="Log/Error/" />
    <appendToFile value="true" />
    <rollingStyle value="Date"/>
    <datePattern value="yyyy-MM-dd-'error.log'"/>
    <maxSizeRollBackups value="100" />
    <staticLogFileName value="false" />
    <encoding value="utf-8" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%newline%date [%thread %-5level] %n -- %m%n" />
    </layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="ERROR" />
      <levelMax value="FATAL" />
    </filter>
  </appender>

  <appender name="WarnRollingFileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="Log/Warn/" />
    <appendToFile value="true" />
    <rollingStyle value="Date"/>
    <datePattern value="yyyy-MM-dd-'warn.log'"/>
    <maxSizeRollBackups value="100" />
    <staticLogFileName value="false" />
    <encoding value="utf-8" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%newline%date [%thread %-5level] %n -- %m%n" />
    </layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="WARN" />
      <levelMax value="WARN" />
    </filter>
  </appender>

  <appender name="InfoRollingFileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="Log/Info/" />
    <appendToFile value="true" />
    <rollingStyle value="Date"/>
    <datePattern value="yyyy-MM-dd-'info.log'"/>
    <maxSizeRollBackups value="100" />
    <staticLogFileName value="false" />
    <encoding value="utf-8" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%newline%date [%thread %-5level] %n -- %m%n" />
    </layout>
    <filter type="log4net.Filter.LevelRangeFilter">
      <levelMin value="TRACE" />
      <levelMax value="INFO" />
    </filter>
  </appender>

 
</log4net>

• 4.Core启用Log4Net

在Program.cs文件里的CreateHostBuilder函数中启用Log4Net 示例代码：

public static IHostBuilder CreateHostBuilder(string[] args) =>
           Host.CreateDefaultBuilder(args)
            .ConfigureLogging(logging =>
            {
                logging.AddLog4Net();//启用Log4Net
            })
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });

• 5.记录日志

1. 创建Logger (Logger为ILoggerFactory类型注入)

_logger = logger.CreateLogger<XController>();
或者
_logger = logger.CreateLogger("记录日志");

2. 输出日志

_logger.LogInformation("输出日志信息");