參考學(xué)習(xí)網(wǎng)址：
http://blog.csdn.net/weifangyh/article/details/8524380
http://blog.csdn.net/dragon_ton/article/details/71601339
https://www.cnblogs.com/kissazi2/p/3392094.html
https://www.cnblogs.com/zeroone/p/3606160.html

1.在AssemblyInfo中添加

[assembly: log4net.Config.XmlConfigurator()]

2.新建一個(gè)控制臺(tái)應(yīng)用程序儒鹿，在項(xiàng)目中引用log4net.dll，然后修改app.config：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>
  </configSections>
  <log4net>
    <!--定義輸出到文件中-->
    <appender name="LogFileAppender" type="log4net.Appender.FileAppender">
      <!--定義文件存放位置-->
      <file value="Log\\LogInfo.txt" />
      <appendToFile value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <!--每條日志末尾的文字說明-->
        <footer value="" />
        <!--輸出格式-->
        <!--樣例：2008-03-26 13:42:32,111 [10] INFO  Log4NetDemo.MainClass [(null)] - info-->
        <conversionPattern value="記錄時(shí)間：%date 線程ID:[%thread] 日志級(jí)別：%-5level - 描述：%message%newline" />
      </layout>
    </appender>
    <appender name="LogFileAppender_Size" type="log4net.Appender.RollingFileAppender">
      <file value="Log\\LogInfo.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Size" />
      <maxSizeRollBackups value="10" />
      <maximumFileSize value="1000KB" />
      <staticLogFileName value="true" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="記錄時(shí)間：%date 線程ID:[%thread] 日志級(jí)別：%-5level - 描述：%message%newline" />
      </layout>
    </appender>
    <appender name="LogFileAppender_Date" type="log4net.Appender.RollingFileAppender">
      <file value="Log\\LogInfo.txt" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="記錄時(shí)間：%date 線程ID:[%thread] 日志級(jí)別：%-5level - 描述：%message%newline" />
      </layout>
    </appender>

    <root>
        <!--日志記錄方式-->
      <appender-ref ref="LogFileAppender_Date" />
    </root>
  </log4net>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
</configuration>

2.新建一個(gè)loggerhelper類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using log4net;
using System.Reflection;

namespace TestLog4Net
{
    public static class LoggerHelper
    {
        private static ILog log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        /// <summary>
        /// 獲取當(dāng)前 Ilog 對(duì)象
        /// </summary>
        public static ILog GetILog
        {
            get
            {
                return log;
            }
        }
        /// <summary>
        /// 記錄錯(cuò)誤日志
        /// </summary>
        /// <param name="message"></param>
        /// <param name="ex"></param>
        public static void Error(object message, Exception ex)
        {
            log.Error(message, ex);
        }
        /// <summary>
        /// 記錄嚴(yán)重錯(cuò)誤
        /// </summary>
        /// <param name="message"></param>
        /// <param name="ex"></param>
        public static void Fatal(object message, Exception ex)
        {
            log.Fatal(message, ex);
        }
        /// <summary>
        /// 記錄一般信息
        /// </summary>
        /// <param name="message"></param>
        public static void Info(object message)
        {
            log.Info(message);
        }
        /// <summary>
        /// 記錄調(diào)試信息
        /// </summary>
        /// <param name="message"></param>
        public static void Debug(object message)
        {
            log.Debug(message);
        }
        /// <summary>
        /// 記錄警告信息
        /// </summary>
        /// <param name="message"></param>
        public static void Warn(object message)
        {
            log.Warn(message);
        }
    }
}

3.使用loggerhelper類

using NLog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestLog4Net
{
    class Program
    {
        static void Main(string[] args)
        {
            
            LoggerHelper.Error("這里存在錯(cuò)誤",null);
            Console.ReadKey();
        }
    }
}

測(cè)試結(jié)果：

測(cè)試結(jié)果

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