.Net Core3.1 MVC + EF Core+ AutoFac+LayUI+Sqlserver的框架搭建log4net日志

    首先新建一个log4net.config文件，配置如下：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    </configSections>

    <log4net>
        <!-- 信息日志类 -->
        <logger name="loginfo">
            <level value="ALL" />
            <appender-ref ref="AdoNetAppender" />
            <appender-ref ref="InfoAppender" />
        </logger>
        <!-- 警告日志类 -->
        <logger name="logwarn">
            <level value="ALL" />
            <appender-ref ref="WarnAppender" />
        </logger>
        <!-- 错误日志类-->
        <logger name="logerror">
            <level value="ALL" />
            <appender-ref ref="AdoNetAppender" />
            <appender-ref ref="ErrorAppender" />
        </logger>
        <!-- 异常日志类-->
        <logger name="logfatal">
            <level value="ALL" />
            <appender-ref ref="AdoNetAppender" />
            <appender-ref ref="FatalAppender" />
        </logger>

        <!-- 文件保存日志 -->
        <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
            <!--日志路径: 兼容相对路径和绝对路径 -->
            <param name= "File" value= "Log\info\"/>
            <!--是否是向文件中追加日志-->
            <param name= "AppendToFile" value= "true"/>
            <!--保留天数-->
            <param name= "MaxSizeRollBackups" value= "10"/>
            <!--日志文件名是否固定不变的-->
            <param name= "StaticLogFileName" value= "false"/>
            <!--日志文件名格式为:20170112.log-->
            <param name= "DatePattern" value= "yyyyMMdd&quot;.log&quot;"/>
            <!--日志根据日期滚动-->
            <param name= "RollingStyle" value= "Date"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="ConversionPattern" value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5p %m%n" />
            </layout>
        </appender>

        <appender name="WarnAppender" type="log4net.Appender.RollingFileAppender">
            <param name= "File" value= "Log\warn\"/>
            <param name= "AppendToFile" value= "true"/>
            <param name= "MaxSizeRollBackups" value= "10"/>
            <param name= "StaticLogFileName" value= "false"/>
            <param name= "DatePattern" value= "yyyyMMdd&quot;.log&quot;"/>
            <param name= "RollingStyle" value= "Date"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="ConversionPattern" value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5p %m%n" />
            </layout>
        </appender>

        <appender name="ErrorAppender" type="log4net.Appender.RollingFileAppender">
            <param name= "File" value= "Log\error\"/>
            <param name= "AppendToFile" value= "true"/>
            <param name= "MaxSizeRollBackups" value= "10"/>
            <param name= "StaticLogFileName" value= "false"/>
            <param name= "DatePattern" value= "yyyyMMdd&quot;.log&quot;"/>
            <param name= "RollingStyle" value= "Date"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="ConversionPattern" value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5p %m%n" />
            </layout>
        </appender>

        <appender name="FatalAppender" type="log4net.Appender.RollingFileAppender">
            <param name= "File" value= "Log\fatal\"/>
            <param name= "AppendToFile" value= "true"/>
            <param name= "MaxSizeRollBackups" value= "10"/>
            <param name= "StaticLogFileName" value= "false"/>
            <param name= "DatePattern" value= "yyyyMMdd&quot;.log&quot;"/>
            <param name= "RollingStyle" value= "Date"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="ConversionPattern" value="%date{yyyy-MM-dd HH:mm:ss.fff} %-5p %m%n" />
            </layout>
        </appender>

        <!-- 控制台输出日志 -->
        <appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
            <mapping>
                <level value="ERROR" />
                <foreColor value="Red, HighIntensity" />
            </mapping>
            <mapping>
                <level value="Info" />
                <foreColor value="Green" />
            </mapping>
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%n%date{HH:mm:ss.fff} %-5level %m" />
            </layout>
            <filter type="log4net.Filter.LevelRangeFilter">
                <param name="LevelMin" value="Info" />
                <param name="LevelMax" value="Fatal" />
            </filter>
        </appender>

        <!-- 数据库保存 -->
        <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
            <bufferSize value="1" />
            <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <connectionString value="data source=.;initial catalog=test_log;integrated security=true" />
            <commandText value="INSERT INTO log([userid],[level],[ip],[msg],[exception]) VALUES (@userid,@level,@ip, @msg,@exception)" />
            <parameter>
                <parameterName value="@userid"/>
                <dbType value="Int64"/>
                <size value="64"/>
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%X{userid}"/>
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@level" />
                <dbType value="String" />
                <size value="50" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%level" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@ip" />
                <dbType value="String" />
                <size value="50" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%X{ip}" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@msg" />
                <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>

    </log4net>
</configuration>

新建一个系统日志通用类：LogHelper

using log4net;
using log4net.Config;
using log4net.Repository;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace Core.Net.Common.Core.Net.Core.Nlog4
{
    /// <summary>
    /// 系统日志记录通用类
    /// </summary>
    public class LogHelper
    {
        private const string repositoryName = "NETCoreRepository";
        private const string configFile = "log4net.config";
        private static ILoggerRepository repository { get; set; }

        private static readonly ILog _loginfo = LogManager.GetLogger(repositoryName, "loginfo");
        private static readonly ILog _logerror = LogManager.GetLogger(repositoryName, "logerror");
        private static readonly ILog _logwarn = LogManager.GetLogger(repositoryName, "logwarn");
        private static readonly ILog _logfatal = LogManager.GetLogger(repositoryName, "logfatal");

        public static void Configure()
        {
            repository = LogManager.CreateRepository(repositoryName);
            XmlConfigurator.Configure(repository, new FileInfo(configFile));
        }
        /// <summary>
        /// 基本信息日志插入
        /// </summary>
        /// <param name="msg"></param>
        public static void Info(string msg)
        {
            _loginfo.Info(msg);
        }
        /// <summary>
        /// 警告信息日志插入
        /// </summary>
        /// <param name="msg"></param>
        public static void Warn(string msg)
        {
            _logwarn.Warn(msg);
        }
        /// <summary>
        /// 错误信息日志插入
        /// </summary>
        /// <param name="msg"></param>
        public static void Error(string msg)
        {
            _logerror.Error(msg);
        }
        /// <summary>
        //异常信息插入
        /// </summary>
        /// <param name="msg"></param>
        public static void Fatal(string msg)
        {
            _logfatal.Fatal(msg);
        }
    }
}

在ConfigureServices方法中注册：

 LogHelper.Configure(); //Nlog4日志

调用：

            LogHelper.Error("11111");
            LogHelper.Info("11111");
            LogHelper.Warn("11111");
            LogHelper.Fatal("111111");

查看：