log4的基础使用

简述：初次使用者可以看这个，后一篇文字会带有公用方法
第一步给应用程序的NuGet包管理中添加log4net

第二步修改app.config在configuration标签下添加如下内容，其中这个logs文件夹不需要新建

  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <appSettings>
  </appSettings>
  <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" >
      <!--日志存储路径-->
      <param name="File" value="Logs/" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="&quot;log_&quot;yyyy-MM-dd&quot;.txt&quot;" />
      <param name="StaticLogFileName" value="false" />
      <layout type="log4net.Layout.PatternLayout,log4net">
        <param name="ConversionPattern" value="%m%n %n" />
      </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>

第三步，定义一个简单的测试类重点下面哪行这个是必须加的
[assembly: log4net.Config.XmlConfigurator(Watch = true)]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using log4net;
using System.Reflection;

[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace ConsoleApplication1
{
    
    
    public class loghelper
    {
    
    

        public void OutputMsg(string msg)
        {
    
    
            ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
            log.Info(msg);
            log.Info("\r\n");
        }
    }
}

第四步，测试使用

 LogHelper log=new LogHelper();
 log.OutputMsg("test");

第五步查看日志，日志在bin的Debug下的log文件夹里面