log4net在.NET Core项目中使用案例

1、新建一个 .NET Core 项目，选择控制台应用程序，名称TestNetCore。

2、使用Nuget程序管理器，添加log4net，

3、添加log4net.config，内容如下

<?xml version="1.0" encoding="utf-8"?>
<!--注意：如果是在aspnetcore中使用的话，在log4net.config就不需要添加configuration标签了，可以参考TestNetCore的AddLog4Net-->
<configuration>
  <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">
      <param name="File" value="LogLog.txt" />
      <param name="AppendToFile" value="true" />
      <param name="MaxSizeRollBackups" value="100" />
      <param name="MaximumFileSize" value="2MB" />
      <param name="RollingStyle" value="Size" />
      <param name="StaticLogFileName" value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%-15p %d [%c] %m%n" />
      </layout>
    </appender>
    <root>
      <!--<level value="off" />-->
      <!--<level value="Fatal" />-->
      <!--<level value="error" />-->
      <!--<level value="Warn" />-->
      <!--<level value="Info" />-->
      <level value="Debug" />
      <!--<level value="all" />-->
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
  </log4net>  
</configuration>

注意：要把log4net.config属性设置成复制到输出目录

4、Program中添加如下

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using System;
using Microsoft.Extensions.Logging;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Globalization;
using System.Reflection;
using log4net;
using System.IO;
using log4net.Repository;
using log4net.Config;

namespace TestNetCore
{
    internal class Program
    {
        //public static log4net.ILog Log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
        static void Main(string[] args)
        {
            ILoggerRepository loggerRepository = LogManager.CreateRepository("TestNetCore");
            //默认配置，这个只输出到控制台，并且这个不需要log4net.config文件
            //BasicConfigurator.Configure(loggerRepository);
            //指定配置文件
            XmlConfigurator.Configure(loggerRepository, new FileInfo("log4net.config"));

            ILog Log = LogManager.GetLogger(loggerRepository.Name, typeof(Program));
            Log.Fatal("Fatal");
            Log.Error("Error");
            Log.Warn("Warn");
            Log.Info("Info");
            Log.Debug("Debug");
            Console.ReadLine();
        }
   }
}

5、运行效果