zoukankan      html  css  js  c++  java
  • Use Multiple log4net Outputs from One Application

    Introduction

    This is an article simply to demonstrate how to use several output log files depending on the library or the application.

    Using the Code

    Developers who develop class libraries may need to log details separate from the main application to support users or to quickly retrieve the data. But when they try to implement this, they will face a problem. This is because normally log4net has only one config section under the ASP.NET web.config file or Windows application app.config file. To overcome this problem, you can use different logger entries which define the output.

    Default case:

    <log4net>
        <appender type="log4net.Appender.RollingFileAppender" name="RollingFile">
            <file value="c:\logs\Log.txt" />
            <layout type="log4net.Layout.PatternLayout" />
                <conversionpattern value="%d [%t] %-5p %c - %m%n" />
            </layout>
        </appender>
    
        <root>
            <level value="ALL" />
            <appender-ref ref="RollingFile" />
        </root>
    </log4net>

    When you specify the <root /> tag, it says all the log data will log to that output file. To stop this, we need to remove the <root /> element and have separate <logger /> tags for every library or the application. You also need to specify your root namespace for the library.

    <log4net>
        <appender type="log4net.Appender.RollingFileAppender" name="classApp1">
          <file value="c:\Library1.txt" />
          <layout type="log4net.Layout.PatternLayout">
            <conversionpattern value="%d [%t] %-5p %c - %m%n" />
          </layout>
        </appender>
    
        <appender type="log4net.Appender.RollingFileAppender" name="classApp2">
          <file value="c:\Library2.txt" />
          <layout type="log4net.Layout.PatternLayout">
            <conversionpattern value="%d [%t] %-5p %c - %m%n" />
          </layout>
        </appender>
    
        <appender type="log4net.Appender.RollingFileAppender" name="application">
          <file value="c:\Application.txt" />
          <layout type="log4net.Layout.PatternLayout">
            <conversionpattern value="%d [%t] %-5p %c - %m%n" />
          </layout>
        </appender>
    
        <logger name="ClassLibrary1">
          <level value="ERROR" />
          <maximumfilesize value="256KB" />
          <param value="ERROR" name="Threshold" />
    
          <appender-ref ref="classApp1" />
        </logger>
    
        <logger name="ClassLibrary2">
          <level value="WARN" />
          <maximumfilesize value="256KB" />
          <param value="WARN" name="Threshold" />
    
          <appender-ref ref="classApp2" />
        </logger>
    
        <logger name="WindowsApplication1">
          <level value="WARN" />
          <maximumfilesize value="256KB" />
          <param value="WARN" name="Threshold" />
    
          <appender-ref ref="application" />
        </logger>
    
      </log4net>

    You can see three <logger /> items and separate <appender />tags referenced from those loggers. "name" of the <logger /> will specify the root namespace of the library or the application. Specify which appender you need to refer from the logger. When executing the application, if something is written to the log from the ClassLibrary2.Class2, it will refer the <logger name="ClassLibrary2" /> entry. This means the output will be on c:\Library2.txt file. This way you can specify any amount of loggers dynamically.

    Note: The code in Visual Studio 2005 format.

    From:  https://www.codeproject.com/Articles/18720/Use-Multiple-log-net-Outputs-from-One-Application

  • 相关阅读:
    slf4j日志框架绑定机制
    Btrace使用入门
    JVM反调调用优化,导致发生大量异常时log4j2线程阻塞
    [转载]Javassist 使用指南(三)
    [转载]Javassist 使用指南(二)
    [转载]Javassist 使用指南(一)
    数组升序排序的方法Arrays.sort();的应用
    copyOfRange的应用
    copyOf数组复制方法的使用(数组扩容练习)
    binarySearch(int[] a,int fromIndex,int toIndex, int key)的用法
  • 原文地址:https://www.cnblogs.com/time-is-life/p/9172688.html
Copyright © 2011-2022 走看看