.Net使用log4net

article/2025/9/29 17:13:33

1.使用Nuget下载log4net

2.、新建Config文件夹，将log4net配置文件放入此文件夹中（当修改web.config的时候会重启网站，所以把log4net单独出来比较好，也好管理），log4net配置：

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="fatalAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="FATAL" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\fatal.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="ERROR" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\err.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<appender name="warnAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="WARN" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\warn.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="INFO" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\info.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<appender name="debugAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="DEBUG" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\debug.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<appender name="perfAppender" type="log4net.Appender.RollingFileAppender">
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="INFO" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<File value="Logs\perf.log" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %logger - %message%newline" />
</layout>
</appender>
<root>
<level value="ALL" />
<appender-ref ref="fatalAppender" />
<appender-ref ref="errorAppender" />
<appender-ref ref="warnAppender" />
<appender-ref ref="infoAppender" />
<appender-ref ref="debugAppender" />
</root>

</log4net>

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3.右键点击第2步骤的log4net文件属性，改成如图所示

在Properties下的AssemblyInfo.cs文件中加入

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

log4帮助类方便使用，代码：

public static class Log4Helper
{
public static void Fatal(Type type, object message, Exception exception = null)
{
ILog log = LogManager.GetLogger(type);
if (exception == null)
log.Fatal(message);
else
log.Fatal(message, exception);
}

public static void Error(Type type, object message, Exception exception = null)
{
ILog log = LogManager.GetLogger(type);
if (exception == null)
log.Error(message);
else
log.Error(message, exception);
}

public static void Warn(Type type, object message, Exception exception = null)
{
ILog log = LogManager.GetLogger(type);
if (exception == null)
log.Warn(message);
else
log.Warn(message, exception);
}

public static void Info(Type type, object message, Exception exception = null)
{
ILog log = LogManager.GetLogger(type);
if (exception == null)
log.Info(message);
else
log.Info(message, exception);
}

public static void Debug(Type type, object message, Exception exception = null)
{
ILog log = LogManager.GetLogger(type);
if (exception == null)
log.Debug(message);
else
log.Debug(message, exception);
}

}

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5、调用：

Log4Helper.Fatal(this.GetType(), "Fatal");
Log4Helper.Error(this.GetType(), "Error", new Exception("error"));
Log4Helper.Warn(this.GetType(), "Warn");
Log4Helper.Info(this.GetType(), "Info");
Log4Helper.Debug(this.GetType(), "Debug");