1、日志文件以大小进行自动变换
<!--日志输出方式-->
<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<!--日志文件名-->
<file value="Log\\LogInfo\\info.log" />
<encoding value="utf-8" />
<!--是否追加到文件-->
<appendToFile value="true" />
<!-- 大小方式 -->
<rollingStyle value="Size" />
<!--日志文件名是否为静态-->
<staticLogFileName value="true"/>
<!--日志文件最多个数-->
<maxSizeRollBackups value="60" />
<!--当个日志文件最大大小-->
<maximumFileSize value="2kB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
2、日志文件以时间自动更换
<!--日志输出方式-->
<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<!--日志文件名前缀-->
<file value="Log\\LogInfo\\info_" />
<encoding value="utf-8" />
<!--是否追加到文件-->
<appendToFile value="true" />
<!--变换新文件的形式为日期-->
<rollingStyle value="Date" />
<!--追加日志名,此配置每分钟生成一个日志文件,eg:info_20211014-1122.log,info_20211014-1123.log-->
<datePattern value="yyyyMMdd-HHmm'.log'" />
<!--追加日志名单引号('')中文字不变,此配置每天生成一个日志文件,eg:info_20211014.log,info_20211015.log-->
<!--<datePattern value="yyyyMMdd'.log'" /> -->
<!--日志文件名是否为静态-->
<staticLogFileName value="false"/>
<!--日志文件最多个数-->
<maxSizeRollBackups value="60" />
<!--当个日志文件最大大小-->
<maximumFileSize value="5MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
3、混合模式
<!--日志输出方式-->
<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<!--日志文件名-->
<file value="Log\\LogInfo\\info_" />
<encoding value="utf-8" />
<!--是否追加到文件-->
<appendToFile value="true" />
<!-- 时间大小混合方式 -->
<rollingStyle value="Composite" />
<!--追加日志名-->
<datePattern value="yyyyMMdd-HHmm'.log'" />
<!--日志文件名是否为静态-->
<staticLogFileName value="false"/>
<!--日志文件最多个数-->
<maxSizeRollBackups value="60" />
<!--当个日志文件最大大小-->
<maximumFileSize value="2kB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
4、过滤日志级别
<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
<file value="Log\\LogError\\err_" />
<encoding value="utf-8" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd'.log'" />
<staticLogFileName value="false"/>
<maxSizeRollBackups value="60" />
<!--输出日志过滤,最小error最大fatal-->
<filter type ="log4net.Filter.LevelRangeFilter">
<levelMin value="ERROR" />
<levelMax value ="FATAL" />
</filter>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
5、完整配置
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
</configSections>
<log4net>
<!--日志输出方式-->
<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<!--日志文件名-->
<file value="Log\\LogInfo\\info_" />
<encoding value="utf-8" />
<!--是否追加到文件-->
<appendToFile value="true" />
<!-- 时间大小混合方式 -->
<rollingStyle value="Composite" />
<!--追加日志名(旧日志文件名)-->
<datePattern value="yyyyMMdd'.log'" />
<!--日志文件名是否为静态-->
<staticLogFileName value="false"/>
<!--日志文件最多个数-->
<maxSizeRollBackups value="60" />
<!--当个日志文件最大大小-->
<maximumFileSize value="5M" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
<file value="Log\\LogError\\err_" />
<encoding value="utf-8" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd'.log'" />
<staticLogFileName value="false"/>
<maxSizeRollBackups value="60" />
<!--输出日志过滤,最小error最大fatal-->
<filter type ="log4net.Filter.LevelRangeFilter">
<levelMin value="ERROR" />
<levelMax value ="FATAL" />
</filter>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="ErrorAppender" />
<appender-ref ref="InfoAppender" />
</root>
</log4net>
</configuration>
6、MVC中简单帮助类
public class Log4NetHelper
{
private static readonly ILog Log;
/// <summary>
/// 初始化
/// </summary>
static Log4NetHelper()
{
var logCfg = new FileInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config"));
XmlConfigurator.ConfigureAndWatch(logCfg);
Log = LogManager.GetLogger("log4net");
}
/// <summary>
/// 写调试日志
/// </summary>
/// <param name="message"></param>
/// <param name="ex"></param>
public static void Debug(string message, Exception ex = null)
{
Log.Debug(message, ex);
}
/// <summary>
/// 写错误日志
/// </summary>
/// <param name="message"></param>
/// <param name="ex"></param>
public static void Error(string message, Exception ex = null)
{
Log.Error(message, ex);
}
/// <summary>
/// 写严重错误日志
/// </summary>
/// <param name="message"></param>
/// <param name="ex"></param>
public static void Fatal(string message, Exception ex = null)
{
Log.Fatal(message, ex);
}
/// <summary>
/// 写信息
/// </summary>
/// <param name="message"></param>
/// <param name="ex"></param>
public static void Info(string message, Exception ex = null)
{
Log.Info(message, ex);
}
}