.net使用Log4net

首先添加log4net的引用，可以使用VS的Nuget下载

我们可以添加一个配置文件取名为Log4net.config

 

 一.新建一个Log4net.config文件，添加以下内容

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>

<log4net>
<!--错误日志-->
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="log\\LogError\\" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyyMM\\yyyyMMdd'.txt'" />
<staticLogFileName value="false" />
<param name="MaxSizeRollBackups" value="100" />
<layout type="log4net.Layout.PatternLayout">
<!--每条日志末尾的文字说明-->
<!--输出格式-->
<!--样例：2008-03-26 13:42:32,111 [10] INFO Log4NetDemo.MainClass [(null)] - info-->
<conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别： %-5level %n错误描述：%message%newline %n" />
</layout>
</appender>

<!--Info日志-->
<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Log\\LogInfo\\" />
<param name="AppendToFile" value="true" />
<param name="MaxFileSize" value="10240" />
<param name="MaxSizeRollBackups" value="100" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMM\\yyyyMMdd'.txt'" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别： %-5level %n日志描述：%message%newline %n" />
</layout>
</appender>

<!--监控日志-->
<appender name="MonitorAppender" type="log4net.Appender.RollingFileAppender">
<param name="File" value="Log\\LogMonitor\\" />
<param name="AppendToFile" value="true" />
<param name="MaxFileSize" value="10240" />
<param name="MaxSizeRollBackups" value="100" />
<param name="StaticLogFileName" value="false" />
<param name="DatePattern" value="yyyyMM\\yyyyMMdd'.txt'" />
<param name="RollingStyle" value="Date" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别： %-5level %n跟踪描述：%message%newline %n" />
</layout>
</appender>

<!--Error日志-->
<logger name="LogError">
<level value="ERROR" />
<appender-ref ref="RollingLogFileAppender" />
</logger>

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

<!--监控日志-->
<logger name="LogMonitor">
<level value="Monitor" />
<appender-ref ref="MonitorAppender" />
</logger>
</log4net>
</configuration>

 

二、添加LoggerHelper类

 

public class LoggerHelper
{
private static readonly log4net.ILog LogInfo = log4net.LogManager.GetLogger("LogInfo");
private static readonly log4net.ILog LogError = log4net.LogManager.GetLogger("LogError");
private static readonly log4net.ILog LogMonitor = log4net.LogManager.GetLogger("LogMonitor");

 

/// <summary>
/// 初始化Log4net
/// </summary>

static LoggerHelper()
{
var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "Log4net.config");
XmlConfigurator.ConfigureAndWatch(logCfg);
}
/// <summary>
/// 记录Error日志
/// </summary>
/// <param name="errorMsg"></param>
/// <param name="ex"></param>
public static void Error(string errorMsg, Exception ex = null)
{
if (ex != null)
{
LogError.Error(errorMsg, ex);
}
else
{
LogError.Error(errorMsg);
}
}

/// <summary>
/// 记录Info日志
/// </summary>
/// <param name="msg"></param>
/// <param name="ex"></param>
public static void Info(string msg, Exception ex = null)
{
if (ex != null)
{
LogInfo.Info(msg, ex);
}
else
{
LogInfo.Info(msg);
}
}

/// <summary>
/// 记录Monitor日志(监控日志)
/// </summary>
/// <param name="msg"></param>
public static void Monitor(string msg)
{
LogMonitor.Info(msg);
}
}

三.配置Log4net的步骤已经完成，接下来就是如何调用，示例在全局捕捉错误过滤器中写日志

[AttributeUsage(AttributeTargets.Class, Inherited = true, AllowMultiple = false)]
public class LogExceptionAttribute:HandleErrorAttribute
{
public override void OnException(ExceptionContext filterContext)
{
if (!filterContext.ExceptionHandled)
{
string controllerName = (string)filterContext.RouteData.Values["controller"];
string actionName = (string)filterContext.RouteData.Values["action"];
string msgTemplate = $"在执行 controller:[{controllerName}] 的 action:[{actionName}] 时产生异常,消息为:{filterContext.Exception.Message}";

LoggerHelper.Error(msgTemplate,filterContext.Exception);

filterContext.Result =new ViewResult() {ViewName = "Error"};
filterContext.HttpContext.Response.Write(filterContext.Exception.Message);
filterContext.ExceptionHandled = true;
}
base.OnException(filterContext);
}
}

搞定