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Log4net 配置输出文本, 按年月日分文件夹

在项目中新建 “log4net.config” 文件

<?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">
            <File value="Log\" />
            <!--是否是向文件中追加日志-->
            <AppendToFile value="true" />
            <!--每个文件的大小-->
            <MaximumFileSize value="1MB"/>
            <!--log文件数-->
            <MaxSizeRollBackups value="10" />
            <!--日志文件名是否是固定不变的-->
            <StaticLogFileName value="false" />
            <!--日志文件名格式为:yyyy-MM-dd.log-->
            <DatePattern value="yyyy\\MM\\dd\\yyyy-MM-dd'.log'" />
            <!--日志根据日期滚动-->
            <RollingStyle value="Date" />
            <layout type="log4net.Layout.PatternLayout">
                <ConversionPattern value="%date %logger [%thread] %level %message%newline" />
            </layout>
        </appender>

        <root>
            <!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->
            <level value="all" />
            <appender-ref ref="RollingLogFileAppender" />
        </root>
    </log4net>
</configuration>

配置好后在程序集 AssemblyInfo.cs 中加入

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

或者用代码初始化

private void InitLog4net()
{
    var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
    XmlConfigurator.ConfigureAndWatch(logCfg);
    //修改日志路径
    var repository = LogManager.GetRepository();
    var appenders = repository.GetAppenders();
    var targetApder = appenders.First() as RollingFileAppender;
    targetApder.File = string.IsNullOrWhiteSpace(Settings.Default.LogPath) ? Path.Combine( Environment.CurrentDirectory,"log.txt") : Settings.Default.LogPath;
    targetApder.ActivateOptions();

    this.log = LogManager.GetLogger("mainlog");
}
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