一、安装NuGet包
二、添加配置
csharp
// log4net日志
builder.Logging.AddLog4Net("CfgFile/log4net.config");
三、配置log4net.config文件
csharp
<?xml version="1.0" encoding="utf-8"?>
<log4net>
<!-- Define some output appenders -->
<appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
<!-- value="logs/log.log"-->
<file value="logs/" />
<!--追加日志内容-->
<appendToFile value="true" />
<!--防止多线程时不能写Log,官方说线程非安全-->
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<!--可以为:Once|Size|Date|Composite-->
<!--Composite为Size和Date的组合-->
<rollingStyle value="Composite" />
<!--当备份文件时,为文件名加的后缀-->
<datePattern value="yyyyMMdd/"log.log"" />
<!--日志最大个数,都是最新的-->
<!--rollingStyle节点为Size时,只能有value个日志-->
<!--rollingStyle节点为Composite时,每天有value个日志-->
<maxSizeRollBackups value="20" />
<!--可用的单位:KB|MB|GB-->
<maximumFileSize value="3MB" />
<!--置为true,当前最新日志文件名永远为file节中的名字-->
<staticLogFileName value="false" />
<!--输出级别在INFO和ERROR之间的日志-->
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ALL" />
<param name="LevelMax" value="FATAL" />
</filter>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
</layout>
</appender>
<!-- error日志 -->
<appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
<file value="logs/" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<rollingStyle value="Composite" />
<datePattern value="yyyyMMdd/"error.log"" />
<maxSizeRollBackups value="20" />
<maximumFileSize value="3MB" />
<staticLogFileName value="false" />
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ERROR" />
<param name="LevelMax" value="ERROR" />
</filter>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
</layout>
</appender>
<root>
<!--控制级别,由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->
<!--OFF:0-->
<!--FATAL:FATAL-->
<!--ERROR: ERROR,FATAL-->
<!--WARN: WARN,ERROR,FATAL-->
<!--INFO: INFO,WARN,ERROR,FATAL-->
<!--DEBUG: INFO,WARN,ERROR,FATAL-->
<!--ALL: DEBUG,INFO,WARN,ERROR,FATAL-->
<priority value="ALL"/>
<level value="INFO"/>
<!--使用上面配置的那个规则-->
<appender-ref ref="rollingAppender" />
<appender-ref ref="errorAppender" />
</root>
</log4net>
四、记录日志
csharp
private readonly ILogger<WeatherForecastController> _logger;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="logger"></param>
public WeatherForecastController(ILogger<WeatherForecastController> logger)
{
_logger = logger;
_logger.LogInformation($"{this.GetType()},info,接口访问Info");
_logger.LogDebug($"{this.GetType()},debugger,接口访问Debugger");
_logger.LogWarning($"{this.GetType()},warning,接口访Warning");
_logger.LogError($"{this.GetType()},error,接口访问Error");
}