Log4Net配置日志

1.log4net

　　1）新建一个Net空白项目，在引用出点击管理NuGet程序包，搜索log4net并安装

　　2）建立log4net.config配置文件

　　　　在configuration里面添加如下代码，级别为All,log的所有消息都可以调用

  <!--配置小节——版本声名-->
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net-net-2.0.8.0"/>
  </configSections>

  <log4net>
    <!--记录器，程序入口-->
    <logger name="logFile">
      <level value="All"/>
      <appender-ref ref="LogFileAppender" />
    </logger>
    <!--附属配置-->
    <appender name="LogFileAppender" type="log4net.Appender.FileAppender">
      <param name="File" value="./Log/log.txt" />
      <param name="AppendToFile" value="true" />

      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%n＝＝＝＝＝＝＝＝＝＝
                                  %n【日志级别】%-5level
                                  %n【记录时间】%date
                                  %n【线程编号】[%thread]
                                  %n【执行时间】[%r]毫秒
                                  %n【出错文件】%F
                                  %n【出错行号】%L
                                  %n【出错的类】%logger 属性[%property{NDC}]
                                  %n【错误描述】%message
                                  %n【错误详情】%newline"/>
      </layout>
    </appender>
  </log4net>

　　并且右键属性，设置  复制到输出目录   为   如果较新则复制

　　　　

　　3）在AssemblyInfo添加config入口

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

　　4）添加一个button，在click项目里面添加调用日志代码

            int i = , j = ;
            try
            {
                int result = i / j;
            }
            catch(Exception ex)
            {
                log.Error("出错了！", ex);
            }

　　

2.封装LogHelper（和上面无关，这个是封装一个LogHelper，包括配置）

　　添加Nuget包log4net

　　新建一个标准库LogHelper

using log4net;
using log4net.Config;
using log4net.Repository;
using System;
using System.IO;
[assembly: XmlConfigurator(Watch = true)]
namespace LogHelper
{
    public class Log4Helper
    {
        private static ILog logger = null;
        public static void LogInfo(string logstr)
        {
            if (logger == null)
                InitLog4net();
            logger.Info(logstr);
        }
        public static void LogError(string logstr, Exception ex = null)
        {
            if (logger == null)
                InitLog4net();
            logger.Error(logstr);
            if (ex != null)
                logger.Error(ex.ToString());
        }
        private static object objlock = new object();//初始化log用的锁
        private static void InitLog4net()
        {
            lock (objlock)
            {
                ILoggerRepository repository = LogManager.CreateRepository("NETCoreRepository");
                //获取配置文件路径
                var conpath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config");
                XmlConfigurator.Configure(repository, new FileInfo(conpath));
                logger = LogManager.GetLogger(repository.Name, "NETCorelog4net");
            }
        }
    }
}

　　在类库添加log4net.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <log4net>
    <root>
      <level value="INFO" />
      <appender-ref ref="infoAppender" />
      <appender-ref ref="errorAppender" />
      <appender-ref ref="sqlAppender" />
    </root>
    <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
      <file value="log/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="'error'yyyyMMdd'.log'" />
      <maxSizeRollBackups value="" />
      <maximumFileSize value="1MB" />
      <threshold value="ERROR" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%newline--------%date--------%newline%message" />
      </layout>
    </appender>
    <appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
      <file value="log/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="'info'yyyyMMdd'.log'" />
      <maxSizeRollBackups value="" />
      <maximumFileSize value="1MB" />
      <threshold value="INFO" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%newline--------%date--------%newline%message" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="Info" />
        <param name="LevelMax" value="Info" />
      </filter>
    </appender>
    <!-- Setup the root category, add the appenders and set the default level -->
  </log4net>
</configuration>

　　打包，其他项目引用这个包，会自动生成log4net.config，设置属性    复制到输出目录->如果较新则复制

　　使用起来也很简单

                Log4Helper.LogInfo("进来了");
                Log4Helper.LogError("error");
                Log4Helper.LogError("error", ex);