using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using log4net;

using System.Reflection;

namespace WebApplication1

{

    public partial class _Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

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

            //记录错误日志

            log.Error("error", new Exception("发生了一个异常"));

            //记录严重错误

            log.Fatal("fatal", new Exception("发生了一个致命错误"));

            //记录一般信息

            log.Info("info");

            //记录调试信息

            log.Debug("debug");

            //记录警告信息

            log.Warn("warn");

        }

    }

}

<log4net>

  <!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL -->

  <!-- Set root logger level to ERROR and its appenders -->

  <root>

    <level value="ALL"/>

    <appender-ref ref="SysAppender"/>

  </root>

  <!-- Print only messages of level DEBUG or above in the packages -->

  <logger name="WebLogger">

    <level value="DEBUG"/>

  </logger>

  <appender name="SysAppender" type="log4net.Appender.RollingFileAppender,log4net" >

    <param name="File" value="App_Data/" />

    <param name="AppendToFile" value="true" />

    <param name="RollingStyle" value="Date" />

    <param name="DatePattern" value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" />

    <param name="StaticLogFileName" value="false" />

    <layout type="log4net.Layout.PatternLayout,log4net">

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

      <param name="Header" value="
----------------------header--------------------------
" />

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

    </layout>

  </appender>

  <appender name="consoleApp" type="log4net.Appender.ConsoleAppender,log4net">

    <layout type="log4net.Layout.PatternLayout,log4net">

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

    </layout>

  </appender>

</log4net>