Log4Net 用法记录

https://www.cnblogs.com/lzrabbit/archive/2012/03/23/2413180.html
https://blog.csdn.net/guyswj/article/details/81940188

一、引用log4net
二、在AssemblyInfo.cs中添加

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

三、新增配置文件log4net.config

<?xml version="1.0" encoding="utf-8"?>

<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
  </configSections>
  <log4net debug="true">
    <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志路径-->
      <param name="File" value="bin\logError\" />
      <!--是否向文件中追加日志-->
      <param name="AppendToFile" value="true" />
      <!--按照何种方式产生多个日志文件(日期[Date],文件大小[Size],混合[Composite])-->
      <param name="RollingStyle" value="Composite" />
      <!--日志文件名格式为:2008-08-31.log-->
      <param name="DatePattern" value="yyyy-MM-dd&quot;.log&quot;" />
      <!--日志保留天数-->
      <param name="MaxSizeRollBackups" value="20" />
      <!--每个文件的大小。只在混合方式与文件大小方式下使用。超出大小后在所有文件名后自动增加正整数重新命名，数字最大的最早写入。可用的单位:KB|MB|GB。不要使用小数,否则会一直写入当前日志-->
      <param name="MaximumFileSize" value="1024KB" />
      <!--日志文件名是否是固定不变的-->
      <param name="StaticLogFileName" value="false" />
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="记录时间：%date%newline线程ID:[%thread]%newline日志级别：%-5level%newline执行时间：%r毫秒%newline出错类：%logger%newline出错位置：%l%newline错误描述：%message%newline异常信息：%exception%newline"/>
      </layout>
    </appender>
    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="bin\logInfo\" />
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyy-MM-dd&quot;.log&quot;" />
      <param name="MaxSizeRollBackups" value="20" />
      <param name="MaximumFileSize" value="1024KB" />
      <param name="StaticLogFileName" value="false" />
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%d %m %n"  />
      </layout>
    </appender>
    <logger name="logerror">
      <level value="ALL" />
      <appender-ref ref="ErrorAppender" />
    </logger>
    <logger name="loginfo">
      <level value="ALL" />
      <appender-ref ref="InfoAppender" />
    </logger>
  </log4net>
</configuration>

四、封装Log4Helper类

public class Log4Helper
{
    public static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("loginfo");
    public static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("logerror");

    public static void Info(params System.Object[] info)
    {
        if (loginfo.IsInfoEnabled)
        {
            string msg = string.Empty;
            msg = toString(info);
            loginfo.Info(msg);
        }
    }

    public static void Error(Exception e, params System.Object[] info)
    {
        if (logerror.IsErrorEnabled)
        {
            string msg = string.Empty;
            msg = toString(info);
            logerror.Error(msg, e);
        }
    }

    /// <summary>
    /// 接收不定参数转为字符串
    /// </summary>
    /// <param name="msg"></param>
    /// <returns></returns>
    public static string toString(params System.Object[] msg)
    {
        string result = string.Empty;
        for (int i = 0; i < msg.Length; i++)
        {
            if (result.Length > 0)
            {
                result = result + " ";
            }
            result = result + msg[i];
        }
        return result;
    }
}

五、调用示例

using ...;
Log4Helper .Info("appKey", "name", 123456789);
// Log4Helper .Error(e, "appKey", "name", 123456789);
Log4Helper .Error(new Exception("log4net测试致命信息"), "appKey", "proCode", 123456789);

log4net使用中loginfo.IsInfoEnabled=false问题解决方法
https://www.cnblogs.com/so-yi/p/9783887.html