log4net创建系统日志的详细步骤

  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    <!--配置一个结点 名称为log4net-->
  </configSections>

<log4net debug="true">
</log4net>

         <appender name="LogFileAppender" type="log4net.Appender.FileAppender" >
             <!--定义的是日志记录到文件的附着器 name表示该附着器的名称-->        
             <!--在log4net中还有一个附着器RollingFileAppender 它表示会循环生成很多文件，举例来说，就是设置一共可以生成20个文件，每个文件的大小为2K，那么如果第一个、-->         
             <!--文件的大小超过2K，就会自动创建一个按顺序命名的文件-->
             <param name="File" value="c:\Log\DBLog.txt" /> <!--日志记录的存在路径-->
             <param name="AppendToFile" value="true" /><!--为true就表示日志会附加到文件，为false，则会重新创建一个新文件-->
             <layout type="log4net.Layout.PatternLayout">
               <!--输出内容控制-->
               <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] - %m%n" />
             </layout>    
         </appender>

        <appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
        <!--设置发送电子邮件的附着器-->
            <authentication value="Basic" />
            <to value="518@qq.com" />
            <from value="a@163.com" />
            <username value="帐号" />
            <password value="密码" />
            <subject value="程序异常日志记录邮件发送" />
            <smtpHost value="smtp.163.com" />
            <bufferSize value="512" />
            <lossy value="true" />
            <evaluator type="log4net.Core.LevelEvaluator">
               <threshold value="debug"/> 
            </evaluator>
            <layout type="log4net.Layout.PatternLayout">
                 <conversionPattern value="%newline%date [%thread] %-5level %logger [%property{NDC}] - %message%newline%newline%newline" />   
            </layout>
        </appender>

         <appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">
             <!--存储到数据库的操作-->
             <bufferSize value="10"/>
             <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
             <connectionString value="server=.;database=Log4Net;user id=sa;password=saa"/>
             <commandText value="INSERT INTO _Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date,                                @log_thread, @log_level, @log_logger, @log_message, @log_exception)"/>
             <parameter>
                 <parameterName value="@log_date"/>
                 <dbType value="DateTime"/>
                 <layout type="log4net.Layout.RawTimeStampLayout"/><!--可以认为是记录日志的时间-->
             </parameter>
             <parameter>
                 <parameterName value="@log_thread"/>
                 <dbType value="String"/>
                 <size value="255"/>
                 <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%thread"/><!--记录日志时的线程号-->
                </layout> 
             </parameter>
             <parameter>
                 <parameterName value="@log_level"/>
                 <dbType value="String"/>
                 <size value="50"/>
                 <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%level"/><!--日志级别-->
                 </layout>
             </parameter>
             <parameter>
                 <parameterName value="@log_logger"/>
                 <dbType value="String"/>
                 <size value="255"/>
                 <layout type="log4net.Layout.PatternLayout">
                     <conversionPattern value="%logger"/><!--哪个记录器存储的该日志-->
                 </layout>
             </parameter>
             <parameter>
                 <parameterName value="@log_message"/>
                 <dbType value="String"/>
                 <size value="4000"/>
                 <layout type="log4net.Layout.PatternLayout">
                     <conversionPattern value="%message"/><!--日志信息-->
                 </layout>
             </parameter>
             <parameter>
                 <parameterName value="@log_exception"/>
                 <dbType value="String"/>
                 <size value="255"/>
                 <layout type="log4net.Layout.ExceptionLayout"/><!--异常信息-->
             </parameter> 
         </appender>

         <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
             <!--这个就是我在上面提到的RollingFileAppender-->
             <file value="example.log" /><!--文件名称-->
             <appendToFile value="false" /><!--会创建新文件，一般设置为true，这里设置为false，是为了看到创建的文件-->
             <maximumFileSize value="1KB" /><!--文件大小-->
             <maxSizeRollBackups value="20" /><!--创建最大文件数-->
             <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%level %thread %logger - %message%newline" />
             </layout>
         </appender>

      <logger name="Loggering">
        <level value="Warn"/>
        <appender-ref ref="ADONetAppender"/>
      </logger>
      <root>
        <level value="info" />
          <!--<appender-ref ref="ADONetAppender" />-->
          <appender-ref ref="SmtpAppender"/>
          <!--<appender-ref ref="LogFileAppender"/>
          <appender-ref ref="ColoredConsoleAppender"/>
          <appender-ref ref="EventLogAppender"/>
          <append-ref ref="NetSendAppender"/>
          <appender-ref ref="RollingFile"/>-->
      </root>

        protected void Application_Start()
        {
            //读取日志  如果使用log4net,应用程序一开始的时候，都要进行初始化配置
            log4net.Config.XmlConfigurator.Configure();

            AreaRegistration.RegisterAllAreas();

            RegisterGlobalFilters(GlobalFilters.Filters);
            RegisterRoutes(RouteTable.Routes);
        }

        private static readonly log4net.ILog log = log4net.LogManager.GetLogger("Loggering");
        public ActionResult About()
        {
             log.Info("log日志信息");
             log.Debug("debug信息");
             log.Error("error信息");
             log.Warn("warn信息");
             Exception ex = new Exception("测试的异常信息");
             log.Fatal("fatal信息", ex);
            return View();
        }

create database Log4Net
go
use Log4Net
create table _log
(
    id int identity(1,1) primary key not null,
    date datetime null,
    thread int null,
    level varchar(10) null,
    logger varchar(20) null,
    Message varchar(100) null,
    Exception varchar(100) null
)