c# log4net 输出日志

小咪咪 2023-03-01 13:52 12阅读 0赞

C\#使用 log4net输出日志 到控制台和文件

1.安装Log4Net

程序包管理控制台搜索Log4Net安装

2.配置Log4Net

安装成功后，在项目根目录新建一个配置文件：log4net.config

<?xml version="1.0" encoding="utf-8" ?>
    <configuration>
      <configSections>
    
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    
      </configSections>
    
      <log4net>
        
    
        
        <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
          
          <param name= "File" value= "App_Log\"/>
          
          <param name= "AppendToFile" value= "true"/>
          
          <param name= "MaxSizeRollBackups" value= "10"/>
          
          <param name= "StaticLogFileName" value= "false"/>
          
          <param name= "DatePattern" value= 'yyyy-MM-dd".log"'/>
          
          <param name= "RollingStyle" value= "Date"/>
          <layout type="log4net.Layout.PatternLayout">
            <param name="ConversionPattern" value="%n%d 耗时%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
          </layout>
        </appender>
        
        
        <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
          <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="Blue" />
          </mapping>
          <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%n%d 程序运行时间:%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
          </layout>
          <filter type="log4net.Filter.LevelRangeFilter">
            <param name="LevelMin" value="Info" />
            <param name="LevelMax" value="Fatal" />
          </filter>
        </appender>
        
        
        
        <root>
          
          <level value="all" />
          <appender-ref ref="ColoredConsoleAppender"/>
          <appender-ref ref="RollingLogFileAppender"/>
          
        </root>
    
      </log4net>
    </configuration>

打开log4net.config文件属性窗口，将复制到输出目录改成“始终复制”

3.在 项目 内Properties文件夹中 AssemblyInfo.cs 中添加一行：

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

4.使用 log4net 输出日志

class Program
        { 
            static void Main(string[] args)
            { 
                InitLog4Net();
    
                var logger = LogManager.GetLogger(typeof(Program));
    
                logger.Info("消息");
                logger.Warn("警告");
                logger.Error("异常");
                logger.Fatal("错误");
    
                Console.ReadLine();
            }
    
            private static void InitLog4Net()
            { 
                var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
                XmlConfigurator.ConfigureAndWatch(logCfg);
            }
        }