<?xml version="1.0" encoding="utf-8"?>
<configuration><configSections><section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/></configSections><log4net><!--定义输出到文件中--><appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender"><!--定义文件存放位置--><file value="Log\\"/><appendToFile value="true"/><rollingStyle value="Date"/><datePattern value="yyyyMM'.log'"/><!--名称是否可以更改 为false为可以更改--><staticLogFileName value="false"/><layout type="log4net.Layout.PatternLayout"><!--每条日志末尾的文字说明--><!--输出格式--><!--样例：{"time":"2008-03-26 13:42:32,111", "info":"info"--><conversionPattern value="{&quot;time&quot;:&quot;%date&quot;,&quot;info&quot;:%message%} %n"/></layout></appender><root><level value="INFO"/><!--文件形式记录日志--><appender-ref ref="RollingLogFileAppender"/></root></log4net><startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup>
</configuration>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace Test
{public class LogUitls{/// <summary>/// 输出日志到Log4Net/// </summary>/// <param name="t"></param>/// <param name="ex"></param>#region static void WriteLog(Type t, Exception ex)public static void WriteLog(Type t, Exception ex){log4net.ILog log = log4net.LogManager.GetLogger(t);log.Error("Error", ex);}#endregion/// <summary>/// 输出日志到Log4Net/// </summary>/// <param name="t"></param>/// <param name="msg"></param>#region static void WriteLog(Type t, string msg)public static void WriteLog(Type t, string msg){log4net.ILog log = log4net.LogManager.GetLogger(t);log.Info(msg);}#endregion}
}

LogUitls.WriteLog(typeof(Form1), "test");