log4net使用方法

1.NuGet包管理器中安装log4net

2.接着在项目中添加log4net.config文件，以及手撸或寻找一个LogHelper

添加完log4net.config一定要设置属性，将其始终复制到输出目录

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>
  <log4net xsi:noNamespaceSchemaLocation="http://csharptest.net/downloads/schema/log4net.xsd"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <root>
      <level value="DEBUG"/>
      <appender-ref ref="ErrorRollingFileAppender"/>
      <appender-ref ref="WarnRollingFileAppender"/>
      <appender-ref ref="InfoRollingFileAppender"/>
      <appender-ref ref="DebugRollingFileAppender"/>
    </root>

    <!--一般错误日志定义，用于记录已知需处理的与未捕获的异常-->
    <!--日志输出格式：[时间]：类名 线程号 消息-->
    <appender name="ErrorRollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelRangeFilter">
        <levelMin value="ERROR"/>
        <levelMax value="FATAL"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
      <file value="logs"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy-MM-dd\&quot;Error.log&quot;"/>
      <staticLogFileName value="false"/>
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%d{yyyy-MM-dd HH:mm:ss.fff}] %-5p %c.%M %t %n%m%n"/>
      </layout>
    </appender>

    <!--警告日志定义，用于记录已知不需处理的异常，系统警告信息-->
    <!--日志输出格式：[时间]：类名 线程号 消息-->
    <appender name="WarnRollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="WARN"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
      <file value="logs"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy-MM-dd\&quot;Warn.log&quot;"/>
      <staticLogFileName value="false"/>
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%d{yyyy-MM-dd HH:mm:ss.fff}] %c.%M %t %m%n"/>
      </layout>
    </appender>

    <!--信息日志定义，用于记录用户相关信息-->
    <!--日志输出格式：[时间]：消息-->
    <appender name="InfoRollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="INFO"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
      <file value="logs"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy-MM-dd\&quot;Info.log&quot;"/>
      <staticLogFileName value="false"/>
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%d{yyyy-MM-dd HH:mm:ss}] %m%n"/>
      </layout>
    </appender>

    <!--信息日志定义，用于收集开发调试信息-->
    <!--日志输出格式：[时间]：类名 线程号 消息-->
    <appender name="DebugRollingFileAppender" type="log4net.Appender.RollingFileAppender">
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="DEBUG"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
      <file value="logs"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyy-MM-dd\&quot;Debug.log&quot;"/>
      <staticLogFileName value="false"/>
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%d{yyyy-MM-dd HH:mm:ss.fff}] %c %t：%m%n"/>
      </layout>
    </appender>

  </log4net>
</configuration>

 1     public static class LogHelper
 2     {
 3         private static readonly log4net.ILog Logerror = log4net.LogManager.GetLogger("DEBUG");
 4 
 5         public static void WriteInfoLog(string info)
 6         {
 7             Logerror.Info(info);
 8         }
 9 
10         public static void WriteErrorLog(string info)
11         {
12             Logerror.Error(info);
13         }
14 
15         public static void WriteDebugLog(string info)
16         {
17             Logerror.Debug(info);
18         }
19 
20         public static void WriteDebugLog(Exception exception)
21         {
22             Logerror.Debug(exception.Message, exception);
23         }
24     }

3.最后需要在AssemblyInfo.cs中添加一行代码

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

效果如下：

1         static void Main(string[] args)
2         {
3             LogHelper.WriteDebugLog("1234444445");
4         }

Demo下载：https://pan.baidu.com/s/1hFXoUPZUWVCwDdjx-bTtHQ