WinForm log4net使用 （另一种）

1.安装程序包log4net.dll

2.AssemblyInfo.cs文件添加

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

3.App.config添加

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>

  <!--Log4Net-->
  <!-- Level的级别，由高到低 -->
  <!-- None > Fatal > ERROR > WARN > DEBUG > INFO > ALL-->
  <!-- 解释：如果level是ERROR，则在cs文件里面调用log4net的info()方法，则不会写入到日志文件中-->
  <log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file type="log4net.Util.PatternString" value=".\log\log_%date{yyyMMdd}.log" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <!--<datePattern value="yyyyMMddhhmmss'.log'"/>-->
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="5MB" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />
        <param name="Header" value=" ----------------------header--------------------------&#xD;&#xA;" />
        <param name="Footer" value=" ----------------------footer--------------------------&#xD;&#xA;" />
      </layout>
    </appender>
    <root>
      <level value="All" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
  <!--log4net配置end-->
</configuration>

4.LoggerHelper.cs

public class LoggerHelper
    {
        private static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");
        private static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");
        private static readonly log4net.ILog logmonitor = log4net.LogManager.GetLogger("logmonitor");
        public static void Error(string ErrorMsg, Exception ex = null)
        {
            if (ex != null)
            {
                logerror.Error(ErrorMsg, ex);
            }
            else
            {
                logerror.Error(ErrorMsg);
            }
        }
        public static void Info(string Msg)
        {
            loginfo.Info(Msg);
        }
        public static void Monitor(string Msg)
        {
            logmonitor.Info(Msg);
        }
    }