Log4Net是常用的功能强大的日志插件，该插件提供了几个默认字段

大家可能都用过Log4Net插件来记录日志，该插件默认提供了这几个字段@log_date, @thread, @log_level, @logger, @message, @exception, 但有时这几个字段不能满足我们记录日志的需求，需要扩展我们所需的其他字段，并记录到数据库。比如，我需要记录UserID，UnitCode，MenuID，OperateType等。下面按步骤介绍一下如何在Log4Net组件下，自定义字段并保存到数据库：

第一步：在数据库日志表中添加自定义字段

第二步：创建Custom实体ActionLoggerInfo

public class ActionLoggerInfo    {        public int UserID { get; set; }        public string UnitCode { get; set; }        public int MenuID { get; set; }        public int OperaterType { get; set; }        public string sMessage { get; set; }        public ActionLoggerInfo(int userId, string unitCode, int menuId, int operaterType,string smessage)        {            this.UserID = userId;            this.UnitCode = unitCode;            this.MenuID = menuId;            this.OperaterType = operaterType;            this.sMessage = smessage;        }    }

第三步：创建Custom转换器ActionConverter

 

/*命名空间引用*/using log4net;using log4net.Layout;using log4net.Layout.Pattern;using log4net.Core;/*代码*/public class ActionConverter : PatternLayoutConverter    {        protected override void Convert(System.IO.TextWriter writer, LoggingEvent loggingEvent)        {            var actionInfo = loggingEvent.MessageObject as ActionLoggerInfo;            if (actionInfo == null)            {                writer.Write("");            }            else            {                switch (this.Option.ToLower())                {                    case "userid":                        writer.Write(actionInfo.UserID);                        break;                    case "unitcode":                        writer.Write(actionInfo.UnitCode);                        break;                    case "menuid":                        writer.Write(actionInfo.MenuID);                        break;                    case "operatertype":                        writer.Write(actionInfo.OperaterType);                        break;                    case "smessage":                        writer.Write(actionInfo.sMessage);                        break;                    default:                        writer.Write("");                        break;                }            }        }    }

 

第四步：创建ActionLayoutPattern

/*命名空间引用*/using log4net;using log4net.Layout;using log4net.Layout.Pattern;using log4net.Core;/*代码*/public class ActionLayoutPattern : PatternLayout    {        public ActionLayoutPattern()        {            this.AddConverter("actionInfo", typeof(ActionConverter));        }    }

第五步：配置log4net.config

第六步：创建Log日志帮助类，LogUtil

 

public class LogUtil{    public LogUtil() { }        private static ActionLoggerInfo _message = null;        private static log4net.ILog _log;        public static log4net.ILog Log        {            get            {                if (_log == null)                {                     _log = LogManager.GetLogger("OperateLogger");                                 }                return _log;            }        }        public static void Debug()        {            if (Log.IsDebugEnabled)            {                Log.Debug(_message);            }        }        public static void Error()        {            if (Log.IsErrorEnabled)            {                Log.Error(_message);            }        }        public static void Fatal()        {            if (Log.IsFatalEnabled)            {                Log.Fatal(_message);            }        }        public static void Info()        {            if (Log.IsInfoEnabled)            {                Log.Info(_message);            }        }        public static void Warn()        {            if (Log.IsWarnEnabled)            {                Log.Warn(_message);            }        }        public static void SaveMessage(int userId, string unitCode, int menuId, int operaterType,string smessage,int level)        {            _message = new ActionLoggerInfo(userId, unitCode, menuId, operaterType, smessage);            switch (level)            {                case 1: Info(); break;                case 2: Warn(); break;                case 3: Error(); break;                case 4: Fatal(); break;                default: break;            }        }}

 

第七步：在具体页面上调用SaveMessage方法，写入日志