log4net简单使用

时间 2019-11-29

标签 log4net log 简单使用繁體版

原文原文链接

使用log4net打印日志很方便，之前我都是本身写日志功能，把错误信息写入到指定文件，使用log4net就省略了这些工做，挺方便的。app

使用log4net须要在.config文件中进行配置debug

<?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 debug="false">

<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="D:\MyWebLog\LogInfo\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd".txt"" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%n日志时间：%d %n日志级别：%-5p%n日志内容：%m%n" />
</layout>
</appender>日志

<appender name="DebugAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="D:\MyWebLog\DebugError\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd".txt"" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%n异常时间：%d %n异常级别：%-5p%n异常内容：%m%n" />
</layout>
</appender>xml

<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="D:\MyWebLog\LogError\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd".txt"" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%n错误时间：%d %n错误级别：%-5p%n错误内容：%m%n" />
</layout>
</appender>对象

<appender name="FatalAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="D:\MyWebLog\LogFatal\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd".txt"" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%n致命错误时间：%d %n致命错误级别：%-5p%n致命错误内容：%m%n" />
</layout>
</appender>utf-8

<appender name="WarnAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="D:\MyWebLog\LogWarn\" />
<param name="AppendToFile" value="true" />
<param name="MaxSizeRollBackups" value="100" />
<param name="MaxFileSize" value="10240" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMMdd".txt"" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%n警告时间：%d %n警告级别：%-5p%n警告内容：%m%n" />
</layout>
</appender>


<logger name="LogInfo">
<level value="Info" />
<appender-ref ref="InfoAppender" />
</logger>


<logger name="LogDebug">
<level value="Debug" />
<appender-ref ref="DebugAppender" />
</logger>


<logger name="LogError">
<level value="Error" />
<appender-ref ref="ErrorAppender" />
</logger>


<logger name="LogFatal">
<level value="Fatal" />
<appender-ref ref="FatalAppender" />
</logger>


<logger name="LogWarn">
<level value="Warn" />
<appender-ref ref="WarnAppender" />
</logger>

</log4net>
</configuration>
string

配置文件可使用项目中默认的配置文件，也能够新建.config。it

1.使用默认的配置文件io

AssemblyInfo.cs中添加[assembly: log4net.Config.XmlConfigurator()]，系统在运行时寻找去默认的配置文件中查找log4net的配置节点class

写一个帮助类，使用单例模式建立日志对象

/// <summary>
/// log4net帮助类
/// </summary>
public class LogHelper
{
private static ILog logInfo = null;//普通日志
private static ILog logDebug = null;//异常信息
private static ILog logError = null;//错误日志
private static ILog logFatal = null;//致命错误
private static ILog logWarn = null;//警告信息

private LogHelper() { }

/// <summary>
/// 普通日志
/// </summary>
/// <returns></returns>
public static ILog GetLogInfo()
{
if(logInfo == null)
{
logInfo = LogManager.GetLogger("LogInfo");
}
return logInfo;
}

/// <summary>
/// 异常信息
/// </summary>
/// <returns></returns>
public static ILog GetLogDebug()
{
if (logDebug == null)
{
logDebug = LogManager.GetLogger("LogDebug");
}
return logDebug;
}

/// <summary>
/// 错误日志
/// </summary>
/// <returns></returns>
public static ILog GetLogError()
{
if (logError == null)
{
logError = LogManager.GetLogger("LogError");
}
return logError;
}

/// <summary>
/// 致命错误
/// </summary>
/// <returns></returns>
public static ILog GetLogFatal()
{
if (logFatal == null)
{
logFatal = LogManager.GetLogger("LogFatal");
}
return logFatal;
}

/// <summary>
/// 警告信息
/// </summary>
/// <returns></returns>
public static ILog GetLogWarn()
{
if (logWarn == null)
{
logWarn = LogManager.GetLogger("LogWarn");
}
return logWarn;
}
}

调用：

LogHelper.GetLogInfo().Info("输出信息");

LogHelper.GetLogError().Error("",new Exception());

2.使用新建立的配置文件

public static readonly ILog logInfo = LogManager.GetLogger("LogInfo");//普通日志
public static readonly ILog logDebug = LogManager.GetLogger("LogDebug");//异常信息
public static readonly ILog logError = LogManager.GetLogger("LogError");//错误日志
public static readonly ILog logFatal = LogManager.GetLogger("LogFatal");//致命错误
public static readonly ILog logWarn = LogManager.GetLogger("LogWarn");//警告信息

手动查找路径下的配置文件，进行读取，添加一下代码

/// <summary>
/// 加载log4net的日志配置文件
/// </summary>
/// <param name="configFilePath">日志配置文件的完整路径</param>
public LogHelper(string configFilePath)
{
   if (string.IsNullOrWhiteSpace(configFilePath) || !File.Exists(configFilePath))
   {
       throw new ArgumentNullException("日志配置文件不存在");
   }
       XmlConfigurator.Configure(new FileInfo(configFilePath));
}

调用：

LogHelper.logInfo.Info("输出信息"); LogHelper.logError.Error("输出信息", new Exception());