C#中异常的记录也有一个模板，就是log4net。多的就不说了直接看怎么用的吧。
1、引用log4net.dll。
2、实现log4net的方法。
 

public class LogImplement
    {
        private ILog logger;

        public LogImplement(ILog log)
        {
            this.logger = log;
        }

        public void Debug(object message)
        {
            this.logger.Debug(message);
        }

        public void Debug(object message, Exception e)
        {
            this.logger.Debug(message, e);
        }

        public void Warming(object message)
        {
            this.logger.Warn(message);
        }

        public void Warming(object message,Exception e)
        {
            this.logger.Warn(message, e);
        }

        public void Error(object message)
        {
            this.logger.Error(message);
        }

        public void Error(object message, Exception e)
        {
            this.logger.Error(message, e);
        }

        public void Info(object message)
        {
            this.logger.Info(message);
        }

        public void Info(object message, Exception e)
        {
            this.logger.Info(message, e);
        }
    }

    public class LogFactory
    {
        static LogFactory()
        {
            FileInfo configFile = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + @"Log.config");

            log4net.Config.XmlConfigurator.Configure(configFile);
        }

        public static LogImplement GetLogger(Type type)
        {
            return new LogImplement(LogManager.GetLogger(type));
        }

        public static LogImplement GetLogger(string str)
        {
            return new LogImplement(LogManager.GetLogger(str));
        }
    }

3、配置文件

<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net-net-2.0"/>
  </configSections>
  <log4net>
    <root>
      <appender-ref ref="ErrorLogFileAppender"/>
      <appender-ref ref="WarningFileAppender"/>
      <appender-ref ref="DebugLogFileAppender"/>
    </root>
    <!--记录warning-->
    <appender name="WarningFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="log\Warn.log"/>
      <appendToFile value="true"/>
      <maxSizeRollBackups value="10"/>
      <maximumFileSize value="1MB"/>
      <rollingStyle value="Size"/>
      <staticLogFileName value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%date] [%-5level] [%logger] - %message%newline"/>
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="WARN"/>
        <param name="LevelMax" value="WARN"/>
      </filter>
    </appender>
    <!--记录错误-->
    <appender name="ErrorLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="log\Error.log"/>
      <appendToFile value="true"/>
      <maxSizeRollBackups value="10"/>
      <maximumFileSize value="1MB"/>
      <rollingStyle value="Size"/>
      <staticLogFileName value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="[%date] [%-5level] [%logger] - %message%newline"/>
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <param name="LevelMin" value="ERROR"/>
        <param name="LevelMax" value="ERROR&