.Net Core3.1 集成Log4net

淩亂°似流年 2023-02-20 03:25 15阅读 0赞

# 准备 #

第一步：nuget 引用 Microsoft.Extensions.Logging.Log4Net.AspNetCore

第二步：在项目中添加log4net.config的配置文件(配置文件在文末)

![20200623090915901.png][]

第三步：在项目中注册使用log4net

方法一：在**Program.cs**中注册，找到 **Program.cs**里的**CreateHostBuilder**

public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)                
            .ConfigureLogging((context, loggingBuilder) =>
            {
                loggingBuilder.AddFilter("System", LogLevel.Warning);
                loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);                   
                loggingBuilder.AddLog4Net();//配置文件,如果名字叫log4net.config，在根目录则可以不指定路径
            })                
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });

方法二：在Startup中注册，将program中的注册换成在startup中的config注册Log4Net

public void Configure(IApplicationBuilder app, IWebHostEnvironment env,ILoggerFactory loggerFactory)
    {
        loggerFactory.AddLog4Net();
    
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseRouting();
    
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }

> 注：两种方法二选一，两种方法都注册的话，日志则会重复写两条

附：log4net.config配置文件

<?xml version="1.0" encoding="utf-8" ?>
    <log4net>
      <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
        
        <param name="File" value="Logs\\" />
        
        <param name= "AppendToFile" value= "true"/>
        
        <param name= "MaxSizeRollBackups" value= "30"/>
        
        <param name= "StaticLogFileName" value= "false"/>
        
        <param name= "DatePattern" value= "yyyy-MM-dd".read.log""/>
        
        <param name= "RollingStyle" value= "Date"/>
        <layout type="log4net.Layout.PatternLayout">
          <param name="ConversionPattern" value="%n＝＝＝＝＝＝＝＝＝＝%n【日志级别】：%-5level%n【记录时间】：%date %n【执行时间】：[%r]毫秒%n【信息详情】%message%n" />
        </layout>
      </appender>
    
      
      <appender name="ManagedColoredConsoleAppender" type="log4net.Appender.ManagedColoredConsoleAppender">
        <mapping>
          <level value="ERROR" />
          <foreColor value="Red" />
        </mapping>
        <mapping>
          <level value="WARN" />
          <foreColor value="Yellow" />
        </mapping>
        <mapping>
          <level value="INFO" />
          <foreColor value="White" />
        </mapping>
        <mapping>
          <level value="DEBUG" />
          <foreColor value="Green" />
        </mapping>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%d{ABSOLUTE} [%thread] %-5p %c{1}:%L - %m%n" />
        </layout>   
      </appender>
    
      <root>
         
        <level value="all" />
        <appender-ref ref="ManagedColoredConsoleAppender"/>
        <appender-ref ref="RollingLogFileAppender"/>
      </root>
    </log4net>

[20200623090915901.png]: https://img-blog.csdnimg.cn/20200623090915901.png