一、用法

1、引入包：https://www.nuget.org/packages/log4net/

2、Main函數

using System;
using System.IO;
using log4net;
using log4net.Config;

namespace Log4NetDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var repository = LogManager.CreateRepository("NETCoreRepository
 
");
            XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
            var log = LogManager.GetLogger("NETCoreRepository", typeof(Program));

            log.Info("this is a info.");
            log.Error("this is an error:", new Exception("this is error."));
            log.Fatal(
 
"this is a fatal.");
            log.Warn("this is a warn");
            Console.WriteLine("finish.");
        }
    }
}

3、新建一個log4net.config配置文件，並設置輸出到程序目錄下。

<?xml version="1.0" encoding="UTF-8"?>

<configuration status="ON">
    <log4net>
        <appender name="ConsoleAppender"
 
 type="log4net.Appender.ConsoleAppender">
            <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
        </appender>
        <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
            <file value="logs/" />
            <appendToFile value="true" />
            <rollingStyle value="Composite" />
            <staticLogFileName value="false" />
            <datePattern value="yyyyMMdd‘.log‘" />
            <maxSizeRollBackups value="10" />
            <maximumFileSize value="1MB" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
            </layout>
        </appender>
        <root level="ALL">
            <appender-ref ref="ConsoleAppender" />
            <appender-ref ref="RollingLogFileAppender" />
        </root>
    </log4net>
</configuration>

4、效果：

C#中使用log4net框架做日誌輸出