Log4net使用

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <logger name="LogInfo">
      <level value="INFO" />
      <appender-ref ref="InfoAppender" />
    </logger>
    <logger name="LogError">
      <level value="ERROR" />
      <appender-ref ref="ErrorAppender" />
    </logger>
    <!--定义输出到文件中-->
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <!--定义文件存放位置-->
      <file value="Extends\logs\"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy\yyyy-MM\yyyy-MM-dd\yyy-MM-dd'.txt'"/>
      <staticLogFileName value="false"/>
      <param name="MaxSizeRollBackups" value="100"/>
      <layout type="log4net.Layout.PatternLayout">
        <!--每条日志末尾的文字说明-->
        <conversionPattern value="%newline%n记录时间：%date %n%message%newline%n"/>
      </layout>
    </appender>
    <!--定义输出到文件中-->
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <!--定义文件存放位置-->
      <file value="Extends\logs\"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy\yyyy-MM\yyyy-MM-dd\yyy-MM-dd error'.txt'"/>
      <staticLogFileName value="false"/>
      <param name="MaxSizeRollBackups" value="100"/>
      <layout type="log4net.Layout.PatternLayout">
        <!--每条日志末尾的文字说明-->
        <conversionPattern value="%newline%n记录时间：%date %n%message%newline%n"/>
      </layout>
    </appender>
  </log4net>
</configuration>

using System;
using System.IO;
using log4net;

namespace JADAY.Frame.Common
{
    public class LogHelper
    {
        public static ILog LogInfo = LogManager.GetLogger("LogInfo");
        public static ILog LogError = LogManager.GetLogger("LogError");
        public static LogHelper Instance;
        public static LogHelper GetInstance()
        {
            return Instance ?? (Instance = new LogHelper());
        }

        public LogHelper()
        {
            var file = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "\App_Data\log4net.cfg.xml");
            log4net.Config.XmlConfigurator.Configure(file);
        }

        public static void SetConfig(FileInfo configFile)
        {
            log4net.Config.XmlConfigurator.Configure(configFile);
        }

        public static void SetConfig()
        {
            var file = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "\App_Data\log4net.cfg.xml");
            log4net.Config.XmlConfigurator.Configure(file);
        }

        /// <summary>
        /// 写日志
        /// </summary>
        /// <param name="info">信息</param>
        public void WriteInfo(string info)
        {
            if (LogInfo.IsInfoEnabled)
            {
                LogInfo.Info(info);
            }
        }
        /// <summary>
        /// 写日志
        /// </summary>
        /// <param name="info">信息</param>
        public void WriteError(string info)
        {
            if (LogError.IsErrorEnabled)
            {
                LogError.Error(info);
            }
        }
    }
}