【c#】log4net用法

log4net用法

1、新建配置文件

在项目的bin文件下新建config文件：\logUtil\bin\Debug\net6.0\log4net.config文件，

2、config配置文件参考：

配置一：

<?xml version="1.0"?>
<configuration>
	<configSections>
		<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
	</configSections>
	<log4net>
		<!--定义输出到文件中-->
		<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
			<!--定义文件存放位置-->
			<file value="log\\" />
			<appendToFile value="true" />
			<rollingStyle value="Date" />
			<datePattern value="yyyy\\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出错类：%logger property: [%property] %n错误描述：%message%newline %n" />
			</layout>
		</appender>
		<root>
			<level value="ALL" />
			<!--文件形式记录日志-->
			<appender-ref ref="RollingLogFileAppender" />
		</root>
	</log4net>
</configuration>

配置二：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
	<configSections>
		<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
	</configSections>
 
	<log4net>
		<logger name="logerror">
			<appender-ref ref="ErrorAppender" />
		</logger>
		<!-- 信息日志类 -->
		<logger name="loginfo">
			<appender-ref ref="InfoAppender" />
		</logger>
		<!--定义输出到文件中-->
		<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
			<!--定义文件存放位置-->
			<file value="log\\"/>
			<appendToFile value="true"/>
			<rollingStyle value="Date"/>
			<datePattern value="yyyyMMdd'.log'"/>
			<staticLogFileName value="false"/>
			<!--定义文件最大个数，超过按顺序删除-->
			<param name="MaxSizeRollBackups" value="100"/>
			<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
			<maximumFileSize value="50MB" />
			<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="%date:   %message%newline %n"/>
			</layout>
		</appender>
		<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
			<!--定义文件存放位置-->
			<file value="log\\Error\\"/>
			<appendToFile value="true"/>
			<rollingStyle value="Date"/>
			<datePattern value="yyyyMMdd'.log'"/>
			<staticLogFileName value="false"/>
			<!--定义文件最大个数，超过按顺序删除-->
			<param name="MaxSizeRollBackups" value="100"/>
			<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
			<maximumFileSize value="50MB" />
			<filter type="log4net.Filter.LevelRangeFilter">
				<levelMin value="Error" />
				<levelMax value="Error" />
			</filter>
			<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="%date: %message%newline %n"/>
			</layout>
		</appender>
	</log4net>
 
</configuration>

配置三：

<?xml version="1.0"?>
<configuration>
	<configSections>
		<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
	</configSections>
	<log4net>
		<!-- 错误日志类-->
		<logger name="logerror">
			<level value="ALL" />
			<appender-ref ref="ErrorAppender" />
		</logger>
		<!-- 信息日志类 -->
		<logger name="loginfo">
			<level value="ALL" />
			<appender-ref ref="InfoAppender" />
		</logger>
		<!-- 错误日志附加介质-->
		<appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
			<param name="File" value="Log\\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".htm"" />
			<param name="RollingStyle" value="Date" />
			<!--布局-->
			<layout type="log4net.Layout.PatternLayout">
			<param name="ConversionPattern" value="<HR COLOR=red>%n异常时间：%d [%t] <BR>%n异常级别：%-5p <BR>%n异 常 类：%c [%x] <BR>%n%m <BR>%n <HR Size=1>"  />
			</layout>
		</appender>
		<!-- 信息日志附加介质-->
		<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="yyyyMMdd".htm"" />
			<param name="RollingStyle" value="Date" />
			<!-- 信息日志布局-->
			<layout type="log4net.Layout.PatternLayout">
			<param name="ConversionPattern" value="<HR COLOR=blue>%n日志时间：%d [%t] <BR>%n日志级别：%-5p <BR>%n日 志 类：%c [%x] <BR>%n%m <BR>%n <HR Size=1>"  />
			</layout>
		</appender>
	</log4net>
</configuration>

如何使用

1、新建项目后，引用log4net的nuget包到项目中
2、将congig文件包括在项目中
3、新建log4net工具l类来写 log4net逻辑代码，注意[assembly: log4net.Config.XmlConfigurator(ConfigFile = “log4net.config”, ConfigFileExtension = “config”, Watch = true)]这个可以写在assembly.cs文件中，如果没有这串代码，文件夹中不会出现log记录文件夹

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", ConfigFileExtension = "config", Watch = true)]
namespace logUtil.Tools
{

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

        public static void WriteInfo(string info)
        {
            Console.WriteLine(info);
            if (loginfo.IsInfoEnabled)
            {
                loginfo.Info(info);
            }
        }

        public static void WriteError(string error)
        {
            Console.WriteLine(error);
            if (logerror.IsErrorEnabled)
            {
                logerror.Error(error);
            }
        }

        public static void WriteError(string info, Exception ex)
        {
            Console.WriteLine(info);
            if (logerror.IsErrorEnabled)
            {
                logerror.Error(info, ex);
            }
        }

    }
}

4、调用日志工具类

 private static void Main(string[] args)
    {
        try
        {
            Console.WriteLine("Hello, World!");
            Logger.WriteError("测试");
            int num =int.Parse("测试") ;
        }
        catch (Exception e)
        {
            Logger.WriteError(e.Message);
        }
       
}

结果图：