[assembly: log4net.Config.XmlConfigurator(Watch = true)]

namespace MyNamespace.Common

{

public
class
LogHelper

{

static LogHelper()

{

var logCfg = new
FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");

XmlConfigurator.ConfigureAndWatch(logCfg);

}

public
static
void WriteError(Type t, Exception ex)

{

log4net.ILog log = log4net.LogManager.GetLogger(t);

log.Error("", ex);

}

public
static
void WriteLog(Type t, string msg)

{

log4net.ILog log = log4net.LogManager.GetLogger(t);

//log.Info(msg + "\r\n");

log.Info(msg);

}

}

}

<?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">

<!--日志路径-->

<param
name= "File"
value= "Log/"/>

<!--是否是向文件中追加日志-->

<param
name= "AppendToFile"
value= "true"/>

<!--log保留天数-->

<param
name= "MaxSizeRollBackups"
value= "10"/>

<!--日志文件名是否是固定不变的-->

<param
name= "StaticLogFileName"
value= "false"/>

<!--日志文件名格式为:2008-08-31.log-->

<param
name= "DatePattern"
value= "yyyy-MM-dd&quot;.log&quot;"/>

<!--日志根据日期滚动-->

<param
name= "RollingStyle"
value= "Date"/>

<layout
type="log4net.Layout.PatternLayout">

<param
name="ConversionPattern"
value="%n%date{HH:mm:ss,fff} [%-5level] %m" />

</layout>

</appender>

<!--
控制台前台显示日志
-->

<appender
name="ColoredConsoleAppender"
type="log4net.Appender.ColoredConsoleAppender">

<mapping>

<level
value="ERROR" />

<foreColor
value="Red, HighIntensity" />

</mapping>

<mapping>

<level
value="Info" />

<foreColor
value="Green" />

</mapping>

<layout
type="log4net.Layout.PatternLayout">

<conversionPattern
value="%n%date{HH:mm:ss,fff} [%-5level] %m" />

</layout>

<filter
type="log4net.Filter.LevelRangeFilter">

<param
name="LevelMin"
value="Info" />

<param
name="LevelMax"
value="Fatal" />

</filter>

</appender>

<root>

<!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->

<level
value="all" />

<!--<appender-ref ref="ColoredConsoleAppender"/>-->

<appender-ref
ref="RollingLogFileAppender"/>

</root>

</log4net>

</configuration>

LogHelper.WriteLog(typeof(MyClass), "here");