日志组件Log4Net

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!--添加自定义节点：log4net  type：解析类名，程序集名(log4net.dll)-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>

  <log4net>
    <!--定义输出到文件中-->
    <appender name="Log4Net_INFO" type="log4net.Appender.RollingFileAppender">
      <!--定义文件存放位置-->
      <file value="C:/log4net/"/>
      <!--是否追加到文件,默认为true，通常无需设置-->
      <appendToFile value="true"/>
      <RollingStyle value="Date"/>
      <!--日期的格式，每天换一个文件记录，如不设置则永远只记录一天的日志，需设置-->
      <DatePattern value="INFO_yyyyMMdd&quot;.log&quot;" />
      <!--日志文件名是否为静态-->
      <StaticLogFileName value="false"/>
      <!--多线程时采用最小锁定-->
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <!--布局（向用户显示最后经过格式化的输出信息）-->
      <layout type="log4net.Layout.PatternLayout">
        <!--
           %m(message):输出的日志消息，如ILog.Debug(…)输出的一条消息 
           %n(new line):换行 
           %d(datetime):输出当前语句运行的时刻 
           %r(run time):输出程序从运行到执行到当前语句时消耗的毫秒数 
           %t(thread id):当前语句所在的线程ID 
           %p(priority): 日志的当前优先级别，即DEBUG、INFO、WARN…等 
           %c(class):当前日志对象的名称，例如：
           %L：输出语句所在的行号 
           %F：输出语句所在的文件名 
           %-数字：表示该项的最小长度，如果不够，则用空格填充
          -->
        <Header value="[Header]&#13;&#10;"/>
        <Footer value="[Footer]&#13;&#10;"/>
        <!--正文-->
        <ConversionPattern value="记录时间：%date 线程ID:[%thread] 日志级别：%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message%newline"  />
      </layout>
    </appender>

    <appender name="Log4Net_ERROR" type="log4net.Appender.RollingFileAppender">
      <file value="C:/log4net/"/>
      <appendToFile value="true"/>
      <RollingStyle value="Date"/>
      <DatePattern value="ERROR_yyyyMMdd&quot;.log&quot;" />
      <StaticLogFileName value="false"/>
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <layout type="log4net.Layout.PatternLayout">
        <Header value="[Header]&#13;&#10;"/>
        <Footer value="[Footer]&#13;&#10;"/>
        <!--正文-->
        <ConversionPattern value="记录时间：%date 线程ID:[%thread] 日志级别：%-5level 出错类：%logger property:[%property{NDC}] - 错误描述：%message%newline"  />
      </layout>
    </appender>

    <root>
      <level value="ERROR"/>
      <appender-ref ref="Log4Net_ERROR" />

      <level value="INFO"/>
      <appender-ref ref="Log4Net_INFO" />
    </root>

  </log4net>

</configuration>

using log4net;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;

//指定log4net使用的config文件来读取配置信息
[assembly: log4net.Config.XmlConfigurator(ConfigFile = @"LogConfigLog4Net.config", Watch = true)]
namespace Project.Log4.Net.LogConfig
{
    /// <summary>
    /// 日志帮助类
    /// </summary>
    public class LogHelper
    {
        private static readonly ConcurrentDictionary<Type, ILog> _loggers = new ConcurrentDictionary<Type, ILog>();

        /// <summary>
        /// 获取记录器
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        private static ILog GetLogger(Type source)
        {
            if (_loggers.ContainsKey(source))
            {
                return _loggers[source];
            }
            else
            {
                ILog logger = LogManager.GetLogger(source);
                _loggers.TryAdd(source, logger);
                return logger;
            }
        }

        /* Log a message object */

        /// <summary>
        /// 调试信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Debug(object source, string message)
        {
            Debug(source.GetType(), message);
        }

        /// <summary>
        /// 调试信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="ps"></param>
        public static void Debug(object source, string message, params object[] ps)
        {
            Debug(source.GetType(), string.Format(message, ps));
        }

        /// <summary>
        /// 调试信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Debug(Type source, string message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsDebugEnabled)
                logger.Debug(message);
        }

        /// <summary>
        /// 关键信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Info(object source, object message)
        {
            Info(source.GetType(), message);
        }

        /// <summary>
        /// 关键信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Info(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsInfoEnabled)
                logger.Info(message);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Warn(object source, object message)
        {
            Warn(source.GetType(), message);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Warn(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsWarnEnabled)
                logger.Warn(message);
        }

        /// <summary>
        /// 错误信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Error(object source, object message)
        {
            Error(source.GetType(), message);
        }

        /// <summary>
        /// 错误信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Error(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsErrorEnabled)
                logger.Error(message);
        }

        /// <summary>
        /// 失败信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Fatal(object source, object message)
        {
            Fatal(source.GetType(), message);
        }

        /// <summary>
        /// 失败信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        public static void Fatal(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsFatalEnabled)
                logger.Fatal(message);
        }

        /* Log a message object and exception */

        /// <summary>
        /// 调试信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Debug(object source, object message, Exception exception)
        {
            Debug(source.GetType(), message, exception);
        }

        /// <summary>
        /// 调试信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Debug(Type source, object message, Exception exception)
        {
            GetLogger(source).Debug(message, exception);
        }

        /// <summary>
        /// 关键信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Info(object source, object message, Exception exception)
        {
            Info(source.GetType(), message, exception);
        }

        /// <summary>
        /// 关键信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Info(Type source, object message, Exception exception)
        {
            GetLogger(source).Info(message, exception);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Warn(object source, object message, Exception exception)
        {
            Warn(source.GetType(), message, exception);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Warn(Type source, object message, Exception exception)
        {
            GetLogger(source).Warn(message, exception);
        }

        /// <summary>
        /// 错误信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Error(object source, object message, Exception exception)
        {
            Error(source.GetType(), message, exception);
        }

        /// <summary>
        /// 错误信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Error(Type source, object message, Exception exception)
        {
            GetLogger(source).Error(message, exception);
        }

        /// <summary>
        /// 失败信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Fatal(object source, object message, Exception exception)
        {
            Fatal(source.GetType(), message, exception);
        }

        /// <summary>
        /// 失败信息
        /// </summary>
        /// <param name="source"></param>
        /// <param name="message"></param>
        /// <param name="exception"></param>
        public static void Fatal(Type source, object message, Exception exception)
        {
            GetLogger(source).Fatal(message, exception);
        }
    }

}

 Log4Net下载地址：http://logging.apache.org/log4net/