1. 添加Log4net引用

2. 添加配置文件

Log.config

<?xml version="1.0" encoding="utf-8"?>

<configuration>

  <log4net>

    <logger name="Log4NetTest">

      <level value="ERROR"/>

      <appender-ref ref="Log4NetTestAppender" />

        <!--Log4NetTestAppender和下面进行对应-->

    </logger>

    <logger name="RYJ.Crm.Quartz">

      <level value="ERROR"/>

      <appender-ref ref="QuartzAppender" />

    </logger>

    <logger name="RYJ.Crm.Services">

      <level value="ERROR"/>

      <appender-ref ref="ServiceAppender" />

    </logger>

    <logger name="RYJ.Crm.ExternalService">

      <level value="ERROR"/>

      <appender-ref ref="ExternalServiceAppender" />

    </logger>

    <logger name="RYJ.Crm.HeartBeat">

      <level value="DEBUG"/>

      <appender-ref ref="HeartBeatAppender" />

    </logger>

    <logger name="RYJ.Crm.System">

      <level value="ERROR"/>

      <appender-ref ref="SystemAppender" />

    </logger>

    <logger name="RYJ.Crm.UrlFilter">

      <level value="DEBUG"/>

      <appender-ref ref="UrlFilterAppender" />

    </logger>

    <logger name="NHibernate">

      <level value="OFF"/>

      <appender-ref ref="NHibernateAppender" />

    </logger>

    <logger name="RYJ.Return">

      <level value="DEBUG"/>

      <appender-ref ref="ReturnAppender" />

    </logger>

    <logger name="RYJ.Crm.Event">

      <level value="DEBUG"/>

      <appender-ref ref="EventAppender" />

    </logger>

    <logger name="RYJ.Crm">

      <level value="ERROR"/>

      <appender-ref ref="EmailAppender" />

    </logger>

    <!--返回值异常日志记录-->

    <appender name="Log4NetTestAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/Log4NetTest/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--返回值异常日志记录-->

    <appender name="ReturnAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/Return/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--事件异常日志记录-->

    <appender name="EventAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/Event/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--系统异常日志记录-->

    <appender name="SystemAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/System/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--调度日志记录-->

    <appender name="QuartzAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/Quartz/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--Service日志记录-->

    <appender name="ServiceAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/Service/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--调用外部服务日志记录-->

    <appender name="ExternalServiceAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/ExternalService/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--HeartBeat日志记录-->

    <appender name="HeartBeatAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/HeartBeat/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--UrlFilter日志记录-->

    <appender name="UrlFilterAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/UrlFilter/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--NHibernate日志记录-->

    <appender name="NHibernateAppender" type="log4net.Appender.RollingFileAppender,log4net" >

      <param name="File" value="Logs/NHibernate/" />

      <param name="AppendToFile" value="true" />

      <param name="RollingStyle" value="Date" />

      <param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;" />

      <param name="StaticLogFileName" value="false" />

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

    <!--邮箱设置-->

    <appender name="EmailAppender" type="log4net.Appender.SmtpAppender">

      <!-- SMTP 验证方式 -->

      <authentication value="Basic" />

      <to value="" />

      <from value="service@daishu360.com" />

      <username value="service@daishu360.com" />

      <password value="DSpuhui360.cn" />

      <subject value="【本地环境】CRM后台API错误异常" />

      <!--邮件服务端-->

      <smtpHost value="smtp.exmail.qq.com"/>

      <bufferSize value="" />

      <lossy value="true" />

      <!--这里我设置的是Error ，会接收（FATAL和ERROR日志）你可以根据自己的需要设置Log4net支持多种级别的日志。优先级从高到低依次排列如下:FATAL > ERROR > WARN > INFO > DEBUG-->

      <evaluator type="log4net.Core.LevelEvaluator">

        <threshold value="OFF"/>

      </evaluator>

      <!--输出格式-->

      <layout type="log4net.Layout.PatternLayout,log4net">

        <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n" />

        <param name="Header" value="
----------------------header--------------------------
" />

        <param name="Footer" value="
----------------------footer--------------------------
" />

      </layout>

    </appender>

  </log4net>

</configuration>

Web.config

 <!--log4net日志配置文件-->

    <add key="log4net" value="config/log4net/log.config" />

3. 注册lognet

  protected void Application_Start()

        {          

            //注册lognet

            var log4NetFileName = FilePath(ConfigurationManager.AppSettings["log4net"]);

            if (File.Exists(log4NetFileName))

            {

                XmlConfigurator.ConfigureAndWatch(new FileInfo(log4NetFileName));

            }

        }

        private static string FilePath(string name)

        {

            if (string.IsNullOrEmpty(name))

            {

                return string.Empty;

            }

            return string.Format("{0}/{1}", AppDomain.CurrentDomain.BaseDirectory.TrimEnd('\\', '/'), name.TrimStart('\\', '/'));

        }

4. 编写Helper

using log4net;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace Log4NetTest

{

    public static class Log4NetUtility

    {

        /// <summary>

        ///     写日志

        /// </summary>

        public static void WriteLog(this string message, string name, Log4NetType logType = Log4NetType.Info)

        {

            var log = GetLog(name);

            if (log == null)

            {

                return;

            }

            if (logType == Log4NetType.Debug)

            {

                log.Debug(message);

                return;

            }

            if (logType == Log4NetType.Error)

            {

                log.Error(message);

                return;

            }

            if (logType == Log4NetType.Fatal)

            {

                log.Debug(message);

                return;

            }

            if (logType == Log4NetType.Info)

            {

                log.Info(message);

                return;

            }

            log.Warn(message);

        }

        /// <summary>

        ///     写异常日志

        /// </summary>

        public static void WriteLog(this Exception exception, string name)

        {

            var log = GetLog(name);

            if (log == null)

            {

                return;

            }

            WriteLog(exception, log);

        }

        /// <summary>

        ///     写异常日志

        /// </summary>

        private static void WriteLog(Exception exception, ILog log)

        {

            if (exception == null)

            {

                return;

            }

            log.Error(exception);

            WriteLog(exception.InnerException, log);

        }

        /// <summary>

        ///     获取日志对象

        /// </summary>

        public static ILog GetLog(string name)

        {

            var logger = LogManager.GetLogger(name);

            return logger;

        }

    }

    /// <summary>

    ///     Log4Net类型枚举

    /// </summary>

    public enum Log4NetType

    {

        /// <summary>

        ///     字段Debug

        /// </summary>

        Debug,

        /// <summary>

        ///     字段Error

        /// </summary>

        Error,

        /// <summary>

        ///     字段Info

        /// </summary>

        Info,

        /// <summary>

        ///     字段Fatal

        /// </summary>

        Fatal,

        /// <summary>

        ///     字段Warn

        /// </summary>

        Warn

    }

    /// <summary>

    ///     类名称：Log4NetName

    ///     命名空间：DaiShu.Crm.Utility

    ///     类功能：日志名称

    /// </summary>

    public class Log4NetName

    {

        /// <summary>

        ///     字段UrlFilter

        /// </summary>

        public const string Log4NetTest = "Log4NetTest";

        /// <summary>

        ///     字段UrlFilter

        /// </summary>

        public const string UrlFilter = "RYJ.Crm.UrlFilter";

        /// <summary>

        ///     字段System

        /// </summary>

        public const string System = "RYJ.Crm.System";

        /// <summary>

        ///     字段Quartz

        /// </summary>

        public const string Quartz = "RYJ.Crm.Quartz";

        /// <summary>

        ///     字段Service

        /// </summary>

        public const string Service = "RYJ.Crm.Services";

        /// <summary>

        ///     字段ExternalService

        /// </summary>

        public const string ExternalService = "RYJ.Crm.ExternalService";

        /// <summary>

        ///     字段Return

        /// </summary>

        public const string Return = "RYJ.Return";

        /// <summary>

        ///     字段HeartBeat

        /// </summary>

        public const string HeartBeat = "RYJ.Crm.HeartBeat";

        /// <summary>

        /// 字段Event

        /// </summary>

        public const string Event = "RYJ.Crm.Event";

    }

}

调用演示

            try

            {

                int n=int.Parse("aaa");

            }

            catch (Exception ex)

            {

                ex.WriteLog(Log4NetName.Log4NetTest);

            }

下载源码

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