C＃使用log4net插件，输出日志到文件

一天一个日志文件，其中包含时间，日志等级，类型，信息

日志输出样式：

 

在Visual Studio中Nuget包管理中搜索下载并 log4Net 插件

 使用 log4net需要自己配置log4net的配置文件，目前，配置文件是用 XML 编写的。一般有两种方式，一种是使用log4net自动生成的 “log4net.xml”进行配置，另一种是直接嵌入到运行程序的 app.config 文件中。

在创建log4net.xml后需要在文件属性中设置复制输出目录：始终复制

日志才会输出到xml中指定的文件夹下

<?xml version="1.0" encoding="utf-8" ?>
<log4net>
	<root>
		<level value="DEBUG" />
		<appender-ref ref="RollingLogFileAppender" />
		<appender-ref ref="ColoredConsoleAppender" />
	</root>
	<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
		<param name="File" value="logs/cmm.log" />
		<param name="AppendToFile" value="true" />
		<rollingStyle value="Size" />
		<maxSizeRollBackups value="10" />
		<maximumFileSize value="1MB" />
		<staticLogFileName value="true" />
		<layout type="log4net.Layout.PatternLayout">
			<conversionPattern value="%date [%02thread] %-5level %logger: %message%newline" />
		</layout>
	</appender>
	<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="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 MainClass - info-->
			<conversionPattern value="%newline%date [%thread] [%-5level] [%logger] ：%message" />
		</layout>
	</appender>
	<appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
		<mapping>
			<level value="ERROR" />
			<foreColor value="Red, HighIntensity" />
		</mapping>
		<mapping>
			<level value="Warn" />
			<foreColor value="Yellow,HighIntensity" />
		</mapping>
		<mapping>
			<level value="Info" />
			<foreColor value="White" />
		</mapping>
		<mapping>
			<level value="Debug" />
			<foreColor value="Purple, HighIntensity" />
		</mapping>

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

再添加一个Log日志工具类，自定义输出内容格式

using log4net;
using System; 
namespace Log4net
{
    public static class Log
    {
        private static ILog log;
        public static void Init(string name)
        {
            log = LogManager.GetLogger(name);
        }
        public static void Info(object message)
        {
            log.Info(message);
        }
        public static void InfoFormat(string format, object arg0)
        {
            log.InfoFormat(format, arg0);
        }
        public static void InfoFormat(string format, object arg0, object arg1)
        {
            log.InfoFormat(format, arg0, arg1);
        }
        public static void InfoFormat(string format, object arg0, object arg1, object arg2)
        {
            log.InfoFormat(format, arg0, arg1, arg2);
        }
        public static void InfoFormat(string format, params object[] args)
        {
            log.InfoFormat(format, args);
        }
        public static void Warning(object message)
        {
            log.Warn(message);
        }
        public static void WarningFormat(string format, object arg0)
        {
            log.WarnFormat(format, arg0);
        }
        public static void WarningFormat(string format, object arg0, object arg1)
        {
            log.WarnFormat(format, arg0, arg1);
        }
        public static void WarningFormat(string format, object arg0, object arg1, object arg2)
        {
            log.WarnFormat(format, arg0, arg1, arg2);
        }
        public static void WarningFormat(string format, params object[] args)
        {
            log.WarnFormat(format, args);
        }
        public static void Error(object message)
        {
            log.Error(message);
        }
        public static void ErrorFormat(string format, object arg0)
        {
            log.ErrorFormat(format, arg0);
        }
        public static void ErrorFormat(string format, object arg0, object arg1)
        {
            log.ErrorFormat(format, arg0, arg1);
        }
        public static void ErrorFormat(string format, object arg0, object arg1, object arg2)
        {
            log.ErrorFormat(format, arg0, arg1, arg2);
        }
        public static void ErrorFormat(string format, params object[] args)
        {
            log.ErrorFormat(format, args);
        }
        public static void Fatal(object message)
        {
            log.Fatal(message);
        }
        public static void FatalFormat(string format, object arg0)
        {
            log.FatalFormat(format, arg0);
        }
        public static void FatalFormat(string format, object arg0, object arg1)
        {
            log.FatalFormat(format, arg0, arg1);
        }
        public static void FatalFormat(string format, object arg0, object arg1, object arg2)
        {
            log.FatalFormat(format, arg0, arg1, arg2);
        }
        public static void FatalFormat(string format, params object[] args)
        {
            log.FatalFormat(format, args);
        }
    }
}

在代码运行时需初始化

    using System.IO;    

    public class Program
    {
        static void Main(string[] args)
        {
            FileInfo fi = new FileInfo("log4net.xml");
            log4net.Config.XmlConfigurator.ConfigureAndWatch(fi);
            Log.Init("初始化日志插件！");
            Log.Info("输出日志信息！");
        }
    }

日志插件