声明：本文所述方法的前提是要首先在项目中添加下列两个引用

在本地生成单个日志文件

直接在配置文件中添加下列代码即可

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
  </configSections>
  
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>

  <log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="E:\Logs\MESLog\" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd'.txt'" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date [%thread] %-5level %logger %message%newline" />
      </layout>
    </appender>

    <root>
      <level value="ALL" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>
</configuration>

注意：<configSections>节点必须位于<configuration>节点下的第一个位置

在程序中具体使用时要在构造方法或者起始main()方法中对配置文件进行引用
log4net.Config.XmlConfigurator.Configure();
完成之后，在所要添加日志的类中实例化CasaLog类就可以了
代码如下：

public static CascLog _log = new CascLog("Datalog");
static void Main(string[] args)
{
     log4net.Config.XmlConfigurator.Configure();
     _log.Info("this is a log!");
}

在本地生成不同的文件夹日志

• 首先在配置文件中加入如下代码

<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>

<log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="E:\Logs\DataLog\"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyyMMdd'.txt'"/>
      <staticLogFileName value="false"/>
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date [%thread] %-5level %logger %message%newline"/>
      </layout>
      <filter type = "log4net.Filter.LoggerMatchFilter">
        <loggerToMatch value = "DataLog"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
    </appender>

    <appender name="ErrorLogAppender" type="log4net.Appender.RollingFileAppender">
      <file value="E:\Logs\ErrorLog\"/>
      <appendToFile value="true"/>
      <rollingStyle value="Date"/>
      <datePattern value="yyyyMMdd'.txt'"/>
      <staticLogFileName value="false"/>
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date [%thread] %-5level %logger %message%newline"/>
      </layout>
      <filter type = "log4net.Filter.LoggerMatchFilter">
        <loggerToMatch value = "ErrorLog"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
    </appender>
    <root>
      <level value="ALL"/>
      <appender-ref ref="RollingLogFileAppender"/>
      <appender-ref ref="ErrorLogAppender"/>
    </root>
  </log4net>

• 之后在程序中做如下操作

class Program
    {
        public static  CascLog _log;
        public static  CascLog errorlog;
        static void Main(string[] args)
        {
            log4net.Config.XmlConfigurator.Configure();
            Testlog();
            _log.Info("test");
            errorlog.Error("hahah");
        }

        public static void Testlog()
        {
            _log = new CascLog("DataLog");
            errorlog = new CascLog("ErrorLog");
        }
    }

其中实例化中括号内的参数 DataLog和ErrorLog 对应配置文件中的<loggerToMatch value = "DataLog"/>和<loggerToMatch value = "ErrorLog"/>

• 程序运行后本地生成日志文件的效果如图

  
  
  log文件夹

继承关系类的日志生成方法

举例说明

• ShellStorageManager类继承StorageManager类

public class ShellStorageManager : StorageManager
{
        public static CascLog shelllog = new CascLog("shellLog");

        public ShellStorageManager() : base(shelllog)
        {
            ...
        }
}

• SubstrateStorageManager类继承StorageManager类

public class SubstrateStorageManager : StorageManager
{
        public static CascLog sublog = new CascLog("subLog");

        public SubstrateStorageManager() : base(sublog)
        {
            ...
        }
}

• 配置文件配置如下

<log4net>
    <appender name="ShellLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="D:\Logs\ShellLog\" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd'.txt'" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date [%thread] %-5level %logger %message%newline" />
      </layout>
      <filter type = "log4net.Filter.LoggerMatchFilter">
        <loggerToMatch value = "shellLog"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
    </appender>
    
    <appender name="SubLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="D:\Logs\SubLog\" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd'.txt'" />
      <staticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date [%thread] %-5level %logger %message%newline" />
      </layout>
      <filter type = "log4net.Filter.LoggerMatchFilter">
        <loggerToMatch value = "subLog"/>
      </filter>
      <filter type="log4net.Filter.DenyAllFilter"/>
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="ShellLogFileAppender" />
      <appender-ref ref="SubLogFileAppender" />
    </root>
  </log4net>

• StorageManager类

public CascLog _log;
public StorageManager(CascLog log)
        {
            OpcClient = new OpcHelper();
            _taskCtrl = new TaskTrackingController();
            StopServiceFlag = false;
            _log = log;
        }

总结

两个类A和B继承类C，添加日志时要对两个类进行分开记录，但此时父类C中的日志如何处理呢？可以通过如上方法，在两个类中通过构造方法传入各自的loggerToMatch value标识值，在父类C中获取到此值，并将其赋给其定义的log引用（_log）即可，这样就可以在父类中完美的区分两个子类的日志记录了。