一、在nuget中搜索log4net,然后直接安装

二、无论是CS还是BS都可以在AssemblyInfo.cs文件里添加以下的语句：
　　[assembly: log4net.Config .XmlConfigurator(ConfigFile ="log4net.config")]

　　还有ConfigFileExtension（配置文件的扩展名） 和 Watch（表示是否监视该配置文件）

       或者建一个类，CS端在Main方法中调用，BS在Global.asax.cs的Application_Start方法中调用

　　

 public class LogHelper
    {
        static LogHelper()
        {
            var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "log4net.config");
            XmlConfigurator.Configure(logCfg);
        }

        private static LogHelper _instance = null;
        private static ILog ILog;

        public static ILog Log(Type t)
        {
            if (_instance == null)
                _instance = new LogHelper();
            ILog = LogManager.GetLogger(t);
            return ILog;
        }

        public static ILog Log(string type)
        {
            if (_instance == null)
                _instance = new LogHelper();
            ILog = LogManager.GetLogger(type);
            return ILog;
        }


    }

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注意配置文件必须要放到bin下面的目录里

三、配置文件

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
  </configSections>
<log4net>
  <appender name="FileAppender" type="log4net.Appender.RollingFileAppender">
    <file value="log\" />
    <appendToFile value="true" />
    <rollingStyle value="Date" />
    <datePattern value="yyyyMMdd'.log'" />
    <staticLogFileName value="false" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
    </layout>
  </appender>
  <root>
    <level value="ALL" />
    <appender-ref ref="FileAppender" />
  </root>
</log4net>
 </configuration>

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还有很多配置可以参考

http://logging.apache.org/log4net/release/config-examples.html

四、调用

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("dfasdfas");
            ILog log = LogHelper.Log(typeof(Program));
            log.Info("dadafds");
            log.Debug("debug");
        }
    }

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