log4net 两种配置方法

一、使用xml配置

①、NuGet   

②、添加log4net.appconfig

　　

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>

    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <param name="Encoding" value="utf-8" />
      <file value="log-file.log" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="Encoding" value="utf-8" />
      <file value="Logger/" />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>

  </log4net>
</configuration>

③、设置生成时复制配置文件（在项目的csproj文件添加节点）

  <ItemGroup>
    <Content Include="log4net.config">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </Content>
  </ItemGroup>

③、后端配置

public ILoggerRepository _log=LogManager.CreateRepository("Logger");
XmlConfigurator.Configure(_log, new FileInfo($@"{currentDirectory}log4net.config"));

二、后端代码配置

①、重写配置项（我这里只写了回滚文件）

public class LoggerHelper
    {
        //重写回滚文件
        public static RollingFileAppender ConfigRollFile()
        {
            string file = $@"{Path.GetDirectoryName(Assembly.GetEntryAssembly().Location)}Logger";
            RollingFileAppender appender = new RollingFileAppender()
            {
                AppendToFile = true,
                RollingStyle = RollingFileAppender.RollingMode.Composite,
                File = file,
                Encoding = Encoding.UTF8,
                StaticLogFileName = false,
                DatePattern = "yyyyMMdd".log"",
                MaxSizeRollBackups = 10,
                MaximumFileSize = "10M",
                Layout = new log4net.Layout.DynamicPatternLayout(
                    "%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"),
            };
            appender.ActivateOptions();
            return appender;
        }
    }

②、设置相应配置（我这里覆盖掉回滚文件配置）

ILoggerRepository  _log = LogManager.CreateRepository("Logger");
  XmlConfigurator.Configure(_log, new FileInfo($@"{currentDirectory}log4net.config"));
  RollingFileAppender appender = LoggerHelper.ConfigRollFile();
  BasicConfigurator.Configure(_log, appender);

 三、获取配置文件属性重新配置

①、修改log4net.config配置文件（其他地方不变）

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="Encoding" value="utf-8" />
      <file type="log4net.Util.PatternString" value="%property{FileAddress}/Logger/"  />
      <appendToFile value="true" />
      <rollingStyle value="Composite" />
      <staticLogFileName value="false" />
      <datePattern value="yyyyMMdd'.log'" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1MB" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>

设置标签

type="log4net.Util.PatternString"、value="%property{FileAddress}/Logger/" ===>log4net 基于log4net.Util.PatternString对属性参数替换

②、后端代码

 ILoggerRepository  _log = LogManager.CreateRepository("Logger");
 log4net.GlobalContext.Properties["FileAddress"] = currentDirectory;
 XmlConfigurator.Configure(_log, new FileInfo($@"{currentDirectory}log4net.config"));