C#/.NET Log4日志的用法

nuget安装log4net包

配置文件代码如下

<?xml version="1.0" encoding="utf-8"?>
<log4net>
	<!-- Define some output appenders -->
	<appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
		<file value="log\log.txt" />

		<!--追加日志内容-->
		<appendToFile value="true" />

		<!--防止多线程时不能写Log,官方说线程非安全-->
		<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

		<!--可以为:Once|Size|Date|Composite-->
		<!--Composite为Size和Date的组合-->
		<rollingStyle value="Composite" />

		<!--当备份文件时,为文件名加的后缀-->
		<datePattern value="yyyyMMdd.TXT" />

		<!--日志最大个数,都是最新的-->
		<!--rollingStyle节点为Size时,只能有value个日志-->
		<!--rollingStyle节点为Composite时,每天有value个日志-->
		<maxSizeRollBackups value="20" />

		<!--可用的单位:KB|MB|GB-->
		<maximumFileSize value="3MB" />

		<!--置为true,当前最新日志文件名永远为file节中的名字-->
		<staticLogFileName value="true" />

		<!--输出级别在INFO和ERROR之间的日志-->
		<filter type="log4net.Filter.LevelRangeFilter">
			<param name="LevelMin" value="DEBUG" />
			<param name="LevelMax" value="FATAL" />
		</filter>

		<!--必须结合起来用,第一个只过滤出WARN,第二个拒绝其它其它日志输出-->
		<!--
		<filter type="log4net.Filter.LevelMatchFilter">
			<param name="LevelToMatch" value="WARN" />
		</filter>
		<filter type="log4net.Filter.DenyAllFilter" />-->

		<layout type="log4net.Layout.PatternLayout">
			<conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
		</layout>
	</appender>

  <!--nhiberate和nhiberateSQL日志-->
	<!--<appender name="nhibernateAppender" type="log4net.Appender.RollingFileAppender">
		<file value="log\nhiberate.txt"/>
		<appendToFile value="true"/>
		<maximumFileSize value="100KB"/>
		<rollingStyle value="Size"/>
		<layout type="log4net.Layout.PatternLayout">
			<conversionPattern value="%d{HH:mm:ss} [%t] %-5p %c - %m%n"/>
		</layout>
	</appender>

	<appender name="nhibernateSQLAppender" type="log4net.Appender.RollingFileAppender">
		<file value="log\nhibernateSQL.txt"/>
		<appendToFile value="true" />
		<rollingStyle value="Composite" />
		<datePattern value="yyyyMMdd" />
		<maxSizeRollBackups value="10" />
		<maximumFileSize value="1MB" />
		<layout type="log4net.Layout.PatternLayout">
			<conversionPattern value="%d{HH:mm:ss} [%t] %-5p %c - %m%n"/>
		</layout>
	</appender>-->

	<!-- levels: OFF > FATAL > ERROR > WARN > INFO > DEBUG  > ALL -->
	<root>
		<priority value="ALL"/>
		<level value="ALL"/>
		<appender-ref ref="rollingAppender" />
	</root>

	<!--<logger name="NHibernate" >
		<level value="ERROR"/>
		<appender-ref ref="nhibernateAppender"/>
	</logger>

	<logger name="NHibernate.SQL">
		<level value="DEBUG"/>
		<appender-ref ref="nhibernateSQLAppender" />
		<appender-ref ref="trace" />
	</logger>-->

</log4net>

创建log4的日志类

public class Logger
{
   static Logger()
   {
       XmlConfigurator.Configure(new FileInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CfgFiles\\log4net.config")));
       ILog Log = LogManager.GetLogger(typeof(Logger));
       Log.Info("系统初始化Logger模块");
   }

   private ILog loger = null;
   public Logger(Type type)
   {
       loger = LogManager.GetLogger(type);
   }

   /// <summary>
   /// Log4日志
   /// </summary>
   /// <param name="msg"></param>
   /// <param name="ex"></param>
   public void Error(string msg = "出现异常", Exception ex = null)
   {
       Console.WriteLine(msg);
       loger.Error(msg, ex);
   }

   /// <summary>
   /// Log4日志
   /// </summary>
   /// <param name="msg"></param>
   public void Warn(string msg)
   {
       Console.WriteLine(msg);
       loger.Warn(msg);
   }

   /// <summary>
   /// Log4日志
   /// </summary>
   /// <param name="msg"></param>
   public void Info(string msg)
   {
       Console.WriteLine(msg);
       loger.Info(msg);
   }

   /// <summary>
   /// Log4日志
   /// </summary>
   /// <param name="msg"></param>
   public void Debug(string msg )
   {
       Console.WriteLine(msg);
       loger.Debug(msg);
   }

   
}

使用

private Logger logger = new Logger(typeof(LuceneQuery));