在VSCode写.netCore 踩坑记三（log4net日志配

1、在vscode内输入快捷键 ctrl + shift + P
选择 “NuGet Packge Manager:add package”
安装包：

log4net

2、创建一个helpers文件夹用于存放log类

根目录创建 helpers 文件夹

复制以下两个文件到项目上
1、log4net.config 文件存放在根目录

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <!-- This section contains the log4net configuration settings -->
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
    </appender>
    
    <appender name="FileAppender" type="log4net.Appender.FileAppender">
      <file value="log-file.log" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
      </layout>
    </appender>
 
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="logfile/" />
      <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>
 
    <!-- Setup the root category, add the appenders and set the default level -->
    <root>
      <level value="ALL" />
      <appender-ref ref="ConsoleAppender" />
      <appender-ref ref="FileAppender" />
      <appender-ref ref="RollingLogFileAppender" />
    </root>
 
  </log4net>
</configuration>

2、LogHelper.cs 文件存放在 helpers 文件夹内

using log4net;
using log4net.Config;
using log4net.Repository;
using System.IO;
 
//按你实际情况修改命名空间
namespace project.helpers
{
    public class LogHelper
    {
        private static ILoggerRepository repository { get; set; }
        private static ILog _log;
        private static ILog log {
            get
            {
                if (_log == null)
                {
                    Configure();
                }
                return _log;
            }
        }
        
        public static void Configure(string repositoryName = "NETCoreRepository", string configFile = "log4net.config")
        {
            repository = LogManager.CreateRepository(repositoryName);
            XmlConfigurator.Configure(repository, new FileInfo(configFile));
            _log = LogManager.GetLogger(repositoryName, "");
        }
 
        public static void Info(string msg)
        {
            log.Info(msg);
        }
 
        public static void Warn(string msg)
        {
            log.Warn(msg);
        }
 
        public static void Error(string msg)
        {
            log.Error(msg);
        }
    }
}

配置后当前目录结构

当前目录结构

修改 Program.cs 文件

using System;
using System.IO;
using Microsoft.Extensions.Configuration;
using project.helpers;
namespace project
{
    class Program
    {
        static void Main(string[] args)
        {
            IConfigurationBuilder builder  = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json");
            IConfigurationRoot configurationRoot = builder.Build();
            String setting = configurationRoot.GetSection("setting").Value;
            Console.WriteLine(setting);

            //LogHelper 用的是单例模式，不需要new对象，直接调用即可
            LogHelper.Info("this is Info");
            LogHelper.Warn("this is Warn");
            LogHelper.Error("this is Error");
        }
    }
}

dotnet run 后的效果
自动在生成目录创建 logfile 文件记录日志

---------------------------------------重点，重点来了-------------------------------------

build时.netcore不会帮你生成config配置文件(如果有办法请指正)，必须自行把log4net.config 复制到生成项目的根目录上

发布时，不要忘记把配置文件复制过来