.Net 6 使用Log4Net

1.首先引入Log4Net的 Nuget包第一个就是

2.复制所需配置文件(文件中包含写入文本日志和数据库日志，自行根据注释选择所需) 取名 log4net.Config

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<?xml version="1.0" encoding="utf-8"?>
<log4net>
    <!-- Define some output appenders -->
    <appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
        <file value="log4\log.txt" />
        <!--追加日志内容-->
        <appendToFile value="true" />
 
        <!--防止多线程时不能写Log,官方说线程非安全-->
        <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
 
        <!--可以为:Once|Size|Date|Composite-->
        <!--Composite为Size和Date的组合-->
        <rollingStyle value="Composite" />
 
        <!--当备份文件时,为文件名加的后缀-->
        <datePattern value="yyyyMMdd.TXT" />
 
        <!--日志最大个数,都是最新的-->
        <!--rollingStyle节点为Size时,只能有value个日志-->
        <!--rollingStyle节点为Composite时,每天有value个日志-->
        <maxSizeRollBackups value="20" />
 
        <!--可用的单位:KB|MB|GB-->
        <maximumFileSize value="3MB" />
 
        <!--置为true,当前最新日志文件名永远为file节中的名字-->
        <staticLogFileName value="true" />
 
        <!--输出级别在INFO和ERROR之间的日志-->
        <filter type="log4net.Filter.LevelRangeFilter">
            <param name="LevelMin" value="ALL" />
            <param name="LevelMax" value="FATAL" />
        </filter>
        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
        </layout>
    </appender>
 
    <!--SqlServer形式-->
    <!--下载NuGet包：  System. Data.SqlClient-->
    <!--log4net日志配置：http://logging.apache.org/log4net/release/config-examples.html -->
    <appender name="AdoNetAppender_SqlServer" type="log4net.Appender.AdoNetAppender">
        <!--日志缓存写入条数 设置为0时只要有一条就立刻写到数据库-->
        <bufferSize value="0" />
        <connectionType value="System.Data.SqlClient.SqlConnection,System.Data.SqlClient, Version=4.6.1.3, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
        <connectionString value="Data Source=DESKTOP-T2D6ILD;Initial Catalog=LogManager;Persist Security Info=True;User ID=sa;Password=sa123" />
        <commandText value="INSERT INTO Log4Net ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
        <parameter>
            <parameterName value="@log_date" />
            <dbType value="DateTime" />
            <layout type="log4net.Layout.RawTimeStampLayout" />
        </parameter>
        <parameter>
            <parameterName value="@thread" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%thread" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@log_level" />
            <dbType value="String" />
            <size value="50" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%level" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@logger" />
            <dbType value="String" />
            <size value="255" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%logger" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@message" />
            <dbType value="String" />
            <size value="4000" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%message" />
            </layout>
        </parameter>
        <parameter>
            <parameterName value="@exception" />
            <dbType value="String" />
            <size value="2000" />
            <layout type="log4net.Layout.ExceptionLayout" />
        </parameter>
    </appender>
     
    <root>
 
        <!--控制级别，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF-->
        <!--OFF:0-->
        <!--FATAL:FATAL-->
        <!--ERROR: ERROR,FATAL-->
        <!--WARN: WARN,ERROR,FATAL-->
        <!--INFO: INFO,WARN,ERROR,FATAL-->
        <!--DEBUG: INFO,WARN,ERROR,FATAL-->
        <!--ALL: DEBUG,INFO,WARN,ERROR,FATAL--> 
        <priority value="ALL"/>
         
        <level value="INFO"/>
        <appender-ref ref="rollingAppender" />
        <appender-ref ref="AdoNetAppender_SqlServer" />
    </root>
</log4net>

3.program.cs 中引入配置

builder.Logging.AddLog4Net("CfgFile/log4net.Config");　　//括号内容为上面配置文件所在地址，我这里是放在根目录下的CfgFile文件下。

4.到这里基础配置已完成，接下来就是使用啦！

新建一个MVC的Controller ，我这里随意取名为 SecendController ，依赖注入的方式打印日志

using Microsoft.AspNetCore.Mvc;
 
namespace Advanced.NET6.Project.Controllers
{
    public class SecendController : Controller
    {
        public ILogger<SecendController> _Logger;
 
        public SecendController(ILogger<SecendController> logger)
        {
            _Logger = logger;
            _Logger.LogInformation($"{this.GetType().Name}被构造了");
        }
 
        public IActionResult Index()
        {
            _Logger.LogInformation($"{this.GetType().Name}被执行了");
            return View();
        }
    }
}