.net core2.0 中使用log4net

1、nuget安裝log4net

2、添加log4net.config配置文件

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!--添加自定義節點：log4net type：解析類名，程序集名(log4net.dll)-->
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
  <log4net>
    <root>
      <!--<level value="DEBUG"/>-->
      <!--控制級別，由低到高: ALL|DEBUG|INFO|WARN|ERROR|FATAL|OFF  ALL表示容許全部的日誌請求。OFF是拒絕全部的請求。-->
      <!--好比定義級別爲INFO，則INFO級別向下的級別，好比DEBUG日誌將不會被記錄-->
      <level value="ALL"/>
      <!--根據log級別記錄到不一樣的日誌文件-->
      <appender-ref ref="ErrorLog" />
    </root>
    <!--Error-->
    <appender name="ErrorLog" type="log4net.Appender.RollingFileAppender">
      <file value="Log/"/>
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <!--日期的格式，天天換一個文件記錄，如不設置則永遠只記錄一天的日誌，需設置-->
      <DatePattern value="yyyyMMdd"_Error.log"" />
      <!--日誌文件名是否爲靜態-->
      <StaticLogFileName value="false"/>
      <!--多線程時採用最小鎖定-->
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <!--佈局（向用戶顯示最後通過格式化的輸出信息）-->
      <layout type="log4net.Layout.PatternLayout">
        <ConversionPattern value="%date 線程ID:[%thread] 日誌級別：%-5level 出錯類：%logger property:[%property{NDC}] - 錯誤描述：%message %newline" />
      </layout>
      <securityContext type="log4net.Util.WindowsSecurityContext">
        <credentials value="Process" />
      </securityContext>
      <filter type="log4net.Filter.LevelRangeFilter">
        <levelMin value="DEBUG" />
        <levelMax value="ERROR" />
      </filter>
    </appender>
    <!--Error-->
  </log4net>
</configuration>

3、編寫loghelper

using GrabNovelApi;
using log4net;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Text;

namespace Grab.api
{
  public static class LogHelper
    {
        private static readonly ConcurrentDictionary<Type, ILog> Loggers = new ConcurrentDictionary<Type, ILog>();

        /// <summary>
        /// 獲取記錄器
        /// </summary>
        /// <param name="source">soruce</param>
        /// <returns></returns>
        private static ILog GetLogger(Type source)
        {
            if (Loggers.ContainsKey(source))
            {
                return Loggers[source];
            }
            else
            {
                ILog logger = LogManager.GetLogger(Startup.repository.Name,source);
                Loggers.TryAdd(source, logger);
                return logger;
            }
        }

        /* Log a message object */

        /// <summary>
        /// 調試信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Debug(object source, string message)
        {
            Debug(source.GetType(), message);
        }

        /// <summary>
        /// 調試信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="ps">ps</param>
        public static void Debug(object source, string message, params object[] ps)
        {
            Debug(source.GetType(), string.Format(message, ps));
        }

        /// <summary>
        /// 調試信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Debug(Type source, string message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsDebugEnabled)
            {
                logger.Debug(message);
            }
        }

        /// <summary>
        /// 關鍵信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Info(object source, object message)
        {
            Info(source.GetType(), message);
        }

        /// <summary>
        /// 關鍵信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Info(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsInfoEnabled)
            {
                logger.Info(message);
            }
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Warn(object source, object message)
        {
            Warn(source.GetType(), message);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Warn(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsWarnEnabled)
            {
                logger.Warn(message);
            }
        }

        /// <summary>
        /// 錯誤信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Error(object source, object message)
        {
            Error(source.GetType(), message);
        }

        /// <summary>
        /// 錯誤信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Error(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsErrorEnabled)
            {
                logger.Error(message);
            }
        }

        /// <summary>
        /// 失敗信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Fatal(object source, object message)
        {
            Fatal(source.GetType(), message);
        }

        /// <summary>
        /// 失敗信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        public static void Fatal(Type source, object message)
        {
            ILog logger = GetLogger(source);
            if (logger.IsFatalEnabled)
            {
                logger.Fatal(message);
            }
        }

        /* Log a message object and exception */

        /// <summary>
        /// 調試信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Debug(object source, object message, Exception exception)
        {
            Debug(source.GetType(), message, exception);
        }

        /// <summary>
        /// 調試信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Debug(Type source, object message, Exception exception)
        {
            GetLogger(source).Debug(message, exception);
        }

        /// <summary>
        /// 關鍵信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Info(object source, object message, Exception exception)
        {
            Info(source.GetType(), message, exception);
        }

        /// <summary>
        /// 關鍵信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Info(Type source, object message, Exception exception)
        {
            GetLogger(source).Info(message, exception);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Warn(object source, object message, Exception exception)
        {
            Warn(source.GetType(), message, exception);
        }

        /// <summary>
        /// 警告信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Warn(Type source, object message, Exception exception)
        {
            GetLogger(source).Warn(message, exception);
        }

        /// <summary>
        /// 錯誤信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Error(object source, object message, Exception exception)
        {
            Error(source.GetType(), message, exception);
        }

        /// <summary>
        /// 錯誤信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Error(Type source, object message, Exception exception)
        {
            GetLogger(source).Error(message, exception);
        }

        /// <summary>
        /// 失敗信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Fatal(object source, object message, Exception exception)
        {
            Fatal(source.GetType(), message, exception);
        }

        /// <summary>
        /// 失敗信息
        /// </summary>
        /// <param name="source">source</param>
        /// <param name="message">message</param>
        /// <param name="exception">ex</param>
        public static void Fatal(Type source, object message, Exception exception)
        {
            GetLogger(source).Fatal(message, exception);
        }
    }
}

4、使用