C#用log4net记录日志

1、首先安装 log4net。

2、新建 log4net.config 文件，右键-属性 “复制到输出目录”设置为“始终复制”

3、设置 log4net.config 配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <!--日志记录组建配置-->
  <log4net>
    <!-- Console部分log输出格式的设定 -->
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger %ndc - %message%newline" />
      </layout>
    </appender>
    <!-- 日志文件部分log输出格式的设定 -->
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <!--<file value="D:/log4netfile.txt" 日志的输出目录/>-->
      <file value="LogsLog_" />　　　　　　
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd'.txt'" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="Header" value=""/>

        <param name="Footer" value=""/>

        <param name="ConversionPattern" value="%n%d [%t] %-5p %c [%x]  - %m" />
      </layout>
    </appender>

    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
</configuration>

4、指定log4net使用.config文件来读取配置信息，写在类的命名空间前面或者

// ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

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

5、记录 log 信息

internal class SubsidyItem
{ 
        ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        public static readonly SIMPEntities SIMP = new SIMPEntities();
        /// <summary>
        /// 添加每月的驻外记录
        /// </summary>
        public void AddSubsidyItem()
        {
            //当前时间
            DateTime Date = DateTime.Now;
            //当前时间的上个月
            DateTime LastDate = Date.AddMonths(-1);
            log.Info("当前插入统计信息的时间为:" + Date.Date.ToString("yyyy-MM-dd HH:mm:ss"));
        }
}