Log4net用法（.config文件）

1.引用log4net.dll

2.在AssemblyInfo.cs中添加初始化：

[assembly: log4net.Config.XmlConfigurator(ConfigFile 
= "log4net.config", Watch = true)]

3.添加配置文件，内容如下：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
  </configSections>
  <log4net>
    <root>
    </root>
    <logger name="OneCardRequest">
      <level value="INFO" />
      <appender-ref ref="rollingRequestFile" />
    </logger>
    <logger name="OneCardResult">
      <level value="INFO" />
      <appender-ref ref="rollingResultFile" />
    </logger>
    <logger name="OneCardException">
      <level value="ERROR" />
      <appender-ref ref="rollingExceptionFile" />
    </logger>
    <logger name="InfoLog">
      <level value="ALL" />
      <appender-ref ref="rollingInfoFile" />
    </logger>
    <appender name="rollingRequestFile" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" type="" value="Log/Request/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%n[%d] %c %n%m%n%n" />
        <param name="Header" value="-----------BEGIN-----------" />
        <param name="Footer" value="------------END------------" />
      </layout>
    </appender>
    <appender name="rollingResultFile" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" type="" value="Log/Result/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%n[%d] %c %n%m%n%n" />
        <param name="Header" value="-----------BEGIN-----------" />
        <param name="Footer" value="------------END------------" />
      </layout>
    </appender>
    <appender name="rollingExceptionFile" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" type="" value="Log/Exception/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%n[%d] %c %n%m%n%n" />
        <param name="Header" value="-----------BEGIN-----------" />
        <param name="Footer" value="------------END------------" />
      </layout>
    </appender>
    <appender name="rollingInfoFile" type="log4net.Appender.RollingFileAppender,log4net" >
      <param name="File" type="" value="Log/Info/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%n[%d] %c %n%m%n%n" />
        <param name="Header" value="-----------BEGIN-----------" />
        <param name="Footer" value="------------END------------" />
      </layout>
    </appender>
  </log4net>
</configuration>

　　4.添加Log4netHelper类：

public class log4netHelper
    {
        /// <summary>
        /// 追加一条一卡通处理异常日志信息
        /// </summary>
        /// <param name="id">请求ID</param>
        /// <param name="ex">异常</param>
        /// <param name="attachMessage">附加信息</param>
        public static void Exception(string id, Exception ex, string attachMessage)
        {
            log4net.ILog log = log4net.LogManager.GetLogger("OneCardException");
            if (log.IsErrorEnabled)
            {
                string strMessage = string.Format("RequestID:{0}
Messsage:{1}
StackTrace:{2}
AttachMessage:{3}", id, ex.Message, ex.StackTrace, attachMessage);
                log.Error(strMessage);
            }
            log = null;
        }
        /// <summary>
        /// 追加一条一卡通请求日志信息
        /// </summary>
        /// <param name="id">请求ID</param>
        /// <param name="ip">请求的IP地址</param>
        /// <param name="datetime">时间</param>
        /// <param name="strParam">请求时传入的参数</param>
        public static void RequestLog(string id, string ip, string datetime, string strParam)
        {
            log4net.ILog log = log4net.LogManager.GetLogger("OneCardRequest");
            if (log.IsInfoEnabled)
            {
                string strMessage = string.Format("RequestID:{0}
IP:{1}
DateTime:{2}
Param:{3}", id, ip, datetime, strParam);
                log.Info(strMessage);
            }
            log = null;
        }
        /// <summary>
        /// 追加一条一卡通处理结果日志
        /// </summary>
        /// <param name="id">请求ID</param>
        /// <param name="datetime">时间</param>
        /// <param name="strResult">处理结果</param>
        public static void ResultLog(string id, string datetime, string strResult)
        {
            log4net.ILog log = log4net.LogManager.GetLogger("OneCardResult");
            if (log.IsInfoEnabled)
            {
                string strMessage = string.Format("RequestID:{0}
DateTime:{1}
Param:{2}", id, datetime, strResult);
                log.Info(strMessage);
            }
            log = null;
        }
        /// <summary>
        /// 追加一条普通的日志信息
        /// </summary>
        /// <param name="message">日志内容</param>
        public static void Info(string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger("InfoLog");
            if (log.IsInfoEnabled)
            {
                log.Info(message);
            }
            log = null;
        }
        
    }

转自：http://www.cnblogs.com/youring2/archive/2011/04/27/2030424.html