log4net（c#） 配置及使用

• 链接：https://www.cnblogs.com/wangboke/p/5344507.html

• 1.引入库log4net.dll

• 2.展开项目文件下的Properties文件夹，打开AssemblyInfo.cs并在AssemblyInfo.cs中添加一行：在AssemblyInfo.cs中添加一行：(其中log4net.config对应配置文件名）

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

• 3.添加log4net.config配置文件： 

• <?xml version="1.0" encoding="utf-8" ?>
  <configuration>
    <configSections>
      <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
    </configSections>
    <log4net>
      <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
        <file value="log\logfile.log"/>
        <appendToFile value="true"/>
        <rollingStyle value="Composite"/>
        <datePattern value="yyyyMMdd"/>
        <maxSizeRollBackups value="10"/>
        <maximumFileSize value="1MB"/>
        <layout type="log4net.Layout.PatternLayout">
          <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
        </layout>
      </appender>
      <root>
        <level value="All"/>
        <appender-ref ref="RollingLogFileAppender"/>
      </root>
    </log4net>
    <startup>
      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
    </startup>
  </configuration>

• 4.添加一个公共的日志管理类AppLog.cs

• using System;
  using System.Collections.Generic;
  using System.Text;
  using log4net;
  using log4net.Config;
  using System.IO;
   
   
  namespace log4net
  {
      /// <summary>
      /// 使用Log4net插件的log日志对象
      /// </summary>
      public static class AppLog
      {
          private static ILog log;
   
          static AppLog()
          {
              XmlConfigurator.ConfigureAndWatch(new FileInfo(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile));
              log = LogManager.GetLogger(typeof(AppLog));
          }
   
          public static void Debug(object message)
          {
              log.Debug(message);
          }
   
          public static void DebugFormatted(string format, params object[] args)
          {
              log.DebugFormat(format, args);
          }
   
          public static void Info(object message)
          {
              log.Info(message);
          }
   
          public static void InfoFormatted(string format, params object[] args)
          {
              log.InfoFormat(format, args);
          }
   
          public static void Warn(object message)
          {
              log.Warn(message);
          }
   
          public static void Warn(object message, Exception exception)
          {
              log.Warn(message, exception);
          }
   
          public static void WarnFormatted(string format, params object[] args)
          {
              log.WarnFormat(format, args);
          }
   
          public static void Error(object message)
          {
              log.Error(message);
          }
   
          public static void Error(object message, Exception exception)
          {
              log.Error(message, exception);
          }
   
          public static void ErrorFormatted(string format, params object[] args)
          {
              log.ErrorFormat(format, args);
          }
   
          public static void Fatal(object message)
          {
              log.Fatal(message);
          }
   
          public static void Fatal(object message, Exception exception)
          {
              log.Fatal(message, exception);
          }
   
          public static void FatalFormatted(string format, params object[] args)
          {
              log.FatalFormat(format, args);
          }
      }
  }

  在任何你想写日志的地方使用，例如：

• AppLog.Info("Info log");
  AppLog.Error("Error log");

   注意：当运行正常没有创建日志文件或者log = LogManager.GetLogger(typeof(AppLog))中log对象字段值为false时，右击log4net.config选择属性-->高级把复制到项目的值改为始终复制