Log4net 记录日志

配置文件

备注，需要放到根目录下面

<?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="yyyy\yyyyMM\yyyyMMdd'.txt'"/>
      <staticLogFileName value="false"/>
      <param name="MaxSizeRollBackups" value="100"/>
      <layout type="log4net.Layout.PatternLayout">
        <!--每条日志末尾的文字说明-->
        <!--输出格式-->
        <!--样例：2008-03-26 13:42:32,111 [10] INFO  Log4NetDemo.MainClass [(null)] - info-->
        <conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别：  %-5level %n出错类：%logger property: [%property{NDC}] - %n错误描述：%message%newline %n"/>
      </layout>
    </appender>
    <root>
      <level value="ERROR"/>
      <!--文件形式记录日志-->
      <appender-ref ref="RollingLogFileAppender"/>
    </root>
  </log4net>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
    </startup>
</configuration>

　　日志类：

   public class WriteLog
    {
        /// <summary>
        /// 输出日志到Log4Net
        /// </summary>
        /// <param name="t"></param>
        /// <param name="ex"></param>
        #region static void WriteErrorLog(Type t, Exception ex)

        public static void WriteErrorLog(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 WriteErrorLog(Type t, string msg)

        public static void WriteErrorLog(Type t, string msg)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(t);
            log.Error(msg);
        }

        #endregion
    }

　　测试调用：

 static void Main(string[] args)
        {
            string a = "aa";
            try
            {
                int i = int.Parse(a);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                WriteLog.WriteErrorLog(typeof(Program), ex);

            }
           
        }

　　备注：如果出现日志无法记录问题，则

//配置log4net
[assembly: log4net.Config.XmlConfigurator(Watch = true)]

在程序的 assembly.cs 里加上 上面这句话