LOG4NET用法

log 4net组件下载:log4net.dll

web.config配置如下：

<? xml version = " 1.0 "  encoding = " utf-8 "   ?>
< configuration >
  < configSections >
   < section name = " log4net "  type = " log4net.Config.Log4NetConfigurationSectionHandler,log4net "   />
  </ configSections >
  < log4net >
   < logger name = " logerror " >
    < level value = " ERROR "   />
    < appender - ref   ref = " ErrorAppender "   />
   </ logger >
   < logger name = " loginfo " >
    < level value = " INFO "   />
    < appender - ref   ref = " InfoAppender "   />
   </ logger >
   < appender name = " ErrorAppender "  type = " log4net.Appender.RollingFileAppender " >
    < param name = " File "  value = " Log//LogError// "   />
    < param name = " AppendToFile "  value = " true "   />
    < param name = " MaxSizeRollBackups "  value = " 100 "   />
    < param name = " MaxFileSize "  value = " 10240 "   />
    < param name = " StaticLogFileName "  value = " false "   />
    < param name = " DatePattern "  value = " yyyyMMdd&quot;.htm&quot; "   />
    < param name = " RollingStyle "  value = " Date "   />
    < layout type = " log4net.Layout.PatternLayout " >
     < param name = " ConversionPattern "  value = " &lt;HR COLOR=red&gt;%n异常时间：%d [%t] &lt;BR&gt;%n异常级别：%-5p 
    & lt;BR & gt; % n异 常 类： % c [ % x]  & lt;BR & gt; % n % m  & lt;BR & gt; % n  & lt;HR Size = 1 & gt; "  />
    </ layout >
   </ appender >
   < appender name = " InfoAppender "  type = " log4net.Appender.RollingFileAppender " >
    < param name = " File "  value = " Log//LogInfo// "   />
    < param name = " AppendToFile "  value = " true "   />
    < param name = " MaxFileSize "  value = " 10240 "   />
    < param name = " MaxSizeRollBackups "  value = " 100 "   />
    < param name = " StaticLogFileName "  value = " false "   />
    < param name = " DatePattern "  value = " yyyyMMdd&quot;.htm&quot; "   />
    < param name = " RollingStyle "  value = " Date "   />
    < layout type = " log4net.Layout.PatternLayout " >
     < param name = " ConversionPattern "  value = " &lt;HR COLOR=blue&gt;%n日志时间：%d [%t] &lt;BR&gt;%n日志级别：%-5p 
    & lt;BR & gt; % n日 志 类： % c [ % x]  & lt;BR & gt; % n % m  & lt;BR & gt; % n  & lt;HR Size = 1 & gt; "  />
    </ layout >
   </ appender >
  </ log4net >
  < system.web >
   < compilation defaultLanguage = " c# "  debug = " true "   />
   < customErrors mode = " RemoteOnly "   />
   < authentication mode = " Windows "   />
   < authorization >
    < allow users = " * "   />
   </ authorization >
   < trace enabled = " false "  requestLimit = " 10 "  pageOutput = " false "  traceMode = " SortByTime "  localOnly = " true "   />
   < sessionState mode = " InProc "  stateConnectionString = " tcpip=127.0.0.1:42424 "  sqlConnectionString = " data source=127.0.0.1;Trusted_Connection=yes "
   cookieless = " false "  timeout = " 20 "   />
   < globalization requestEncoding = " utf-8 "  responseEncoding = " utf-8 "   />
  </ system.web >
</ configuration >

LOG操作类

using  System;
using  System.IO;

namespace  TankAction.SystemLog
{
    /**//// <summary>
    /// LogHelper的摘要说明。
    /// </summary>
    public class LogHelper
    {
        private SystemLog()
        {
        }

        public static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");

        public static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");

        public static void SetConfig()
        {
            log4net.Config.DOMConfigurator.Configure();
        }

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

        public static void WriteLog(string info)
        {
            if(loginfo.IsInfoEnabled)
            {
                loginfo.Info(info);
            }
        }

        public static void WriteLog(string info,Exception se)
        {
            if(logerror.IsErrorEnabled)
            {
                logerror.Error(info,se);
            }
        }
    }
}

Global.asax.cs文件配置如下：

   protected   void  Application_Start(Object sender, EventArgs e)
   {
            SystemLog.SetConfig();
  }
   protected   void  Application_Error(Object sender, EventArgs e)
   {
   Exception objExp = HttpContext.Current.Server.GetLastError();
   LogHelper.WriteLog("/r/n客户机IP:"+ Request.UserHostAddress +"/r/n错误地址:"+ Request.Url +"/r/n异常信息:"+ Server.GetLastError().Message,objExp);
  }

eg:
   try
   {}
   catch(Exception ex)
   {
       LogHelper.WriteLog("ErrorInfo"ex);
   }

来源：http://fanrsh.cnblogs.com/archive/2006/06/08/420546.html