log4net 记录到数据库和本地文件

1)配置代码

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

  <configuration>
    <configSections>
      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
    </configSections>

    <log4net>

      <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
        <!--日志路径-->
        <param name= "File" value= "D:\App_Log\G2\"/>
        <!--是否是向文件中追加日志-->
        <param name= "AppendToFile" value= "true"/>
        <!--log保留天数-->
        <param name= "MaxSizeRollBackups" value= "10"/>
        <!--日志文件名是否是固定不变的-->
        <param name= "StaticLogFileName" value= "false"/>
        <!--日志文件名格式为:2008-08-31.log-->
        <param name= "DatePattern" value= "yyyy-MM-dd".read.log""/>
        <!--日志根据日期滚动-->
        <param name= "RollingStyle" value= "Date"/>
        <layout type="log4net.Layout.PatternLayout">
          <param name="ConversionPattern" value="%d [%t] %-5p %c - %m%n %loggername" />
        </layout>
      </appender>

      <!--<logger name="WebLogger">
        <level value="INFO"/>
        <appender-ref ref="ADONetAppender" />

      </logger>-->

      <!--<logger name="WebTest">
        <level value="INFO"/>
        <appender-ref ref="ADONetTest" />

      </logger>-->

      <!--SQL数据库-->
      <appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">

        <bufferSize value="1"/>

        <!-- SQL数据源  -->
        <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

        <!-- SQL连接字符串-->
        <connectionString value="data source=xxx.sqlserver.rds.aliyuncs.com,13433;initial catalog=dbtest;integrated security=False;persist security info=True;User ID=sa;Password=123" />

        <commandText value="INSERT INTO ErrLog ([RecordTime],[LevelName],[Message],[Exception],[UserID]) VALUES (@log_date, @log_level, @message, @exception, @UserID)"/>

        <parameter>
          <parameterName value="@log_date"/>
          <dbType value="DateTime"/>
          <layout type="log4net.Layout.RawTimeStampLayout"/>
        </parameter>

        <parameter>
          <parameterName value="@log_level"/>
          <dbType value="String"/>
          <size value="50"/>
          <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%level"/>
          </layout>
        </parameter>

        <parameter>
          <parameterName value="@exception"/>
          <dbType value="String"/>
          <size value="2000"/>
          <layout type="log4net.Layout.ExceptionLayout"/>
        </parameter>

        <parameter>
          <parameterName value="@message"/>
          <dbType value="String"/>
          <size value="4000"/>
          <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%message"/>
          </layout>
        </parameter>

        <!--自定义成员 -->
        <parameter>
          <parameterName value="@UserID" />
          <dbType value="Int32" />

          <layout type="G2.Log.CustomLayout">
            <conversionPattern value="%UserId" />
          </layout>

        </parameter>

      </appender>

      <root>
        <!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->
        <level value="all" />
        <appender-ref ref="ADONetAppender"/>
        <appender-ref ref="RollingLogFileAppender"/>
      </root>

    </log4net>

    <startup>
      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
    </startup>

  </configuration>

　　

2)LogHelper

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using log4net;
using log4net.Core;
using log4net.Layout.Pattern;

namespace G2.Log
{
    public class LogMessage
    {
        public string  Message { get; set; }
        public int UserId { get; set; }
        public override string ToString()
        {
            return Message;
        }
    }

    public class CustomLayout : log4net.Layout.PatternLayout
    {
        public CustomLayout()
        {
            this.AddConverter("UserId", typeof(UserIdPatternConverter));

        }
    }
    internal sealed class UserIdPatternConverter : PatternLayoutConverter
    {
        override protected void Convert(TextWriter writer, LoggingEvent loggingEvent)
        {
            var logMessage = loggingEvent.MessageObject as LogMessage;

            if (logMessage != null)
            {
                writer.Write(logMessage.UserId);
            }
        }
    }
  public  class LogHelper
  {
      public static string Path = System.Configuration.ConfigurationManager.AppSettings["log4net"] ;
      public static string LoggerName = System.Configuration.ConfigurationManager.AppSettings["loggerName"];
        static  LogHelper()
        {
              if (string.IsNullOrEmpty(Path))
              {
                  Path = AppDomain.CurrentDomain.BaseDirectory + "log4net.config";

              }
              if (string.IsNullOrEmpty(LoggerName))
              {
                  LoggerName = "G2.Core";

              }
        }

        private static ILog _log;

        public static ILog Log
        {
            get
            {
                if (_log == null)
                {
                    string path = Path;
                    log4net.Config.XmlConfigurator.Configure(new FileInfo(path));
                    _log = log4net.LogManager.GetLogger(LoggerName);
                }
                return _log;

            }
        }

        /// <summary>
        /// 调试
        /// </summary>
        public static void Debug(LogMessage message)
        {
            if (Log.IsDebugEnabled)
            {
                Log.Debug(message);
            }
        }

        /// <summary>
        /// 错误
        /// </summary>
        public static void Error(LogMessage message, Exception ex)
        {
            if (Log.IsErrorEnabled)
            {
                Log.Error(message,ex);
            }
        }

        /// <summary>
        /// 严重错误
        /// </summary>
        public static void Fatal(LogMessage message, Exception ex)
        {
            if (Log.IsFatalEnabled)
            {
                Log.Fatal(message);
            }
        }

        /// <summary>
        /// 记录一般日志
        /// </summary>
        public static void Info(LogMessage message)
        {
            if (Log.IsInfoEnabled)
            {
                Log.Info(message);
            }
        }

        /// <summary>
        /// 记录警告
        /// </summary>
        public static void Warn(LogMessage message)
        {
            if (Log.IsWarnEnabled)
            {
                Log.Warn(message);
            }
        }

        /// <summary>
        /// 需要写日志的地方调用此方法
        /// </summary>  

        /// <param name="level">自定义级别</param>
        ///   <param name="logMessage">日志消息</param>
        ///  <param name="ex">异常</param>
        public static void SaveMessage(LogLevel level,LogMessage logMessage, Exception ex)
        {

            switch (level)
            {
                case LogLevel.Debug :
                    Debug(logMessage);
                    break;
                case LogLevel.Info:
                    Info(logMessage);
                    break;

                case LogLevel.Warn:
                   Warn(logMessage);
                    break;

                case LogLevel.Error:
                    Error(logMessage,ex);
                    break;

                case LogLevel.Fatal:
                    Fatal(logMessage,ex);
                    break;

                default: break;
            }
        }

    }

    public enum LogLevel
    {
        Debug=0,
        Info=1,
        Warn=2,
        Error=3,
        Fatal=4
    }
}

　　

3)调用

 class Program
    {
        static void Main(string[] args)
        {
            LogMessage log=new LogMessage();
            log.UserId = 19;
            log.Message = "asdfasd";
            try
            {
                throw new Exception("一个空的引用对象");
            }
            catch (Exception ex)
            {

                LogHelper.SaveMessage( LogLevel.Error,log,ex); 

            }

            Console.Read();
        }
    }