C# log4net 不輸出日志

本文轉載自查看原文 2013-04-17 17:41 25282 C#

一個新項目，直接用了一些之前的代碼，突然跟蹤不到日志了。檢查發現了原因，特在此記錄。

log4net的配置文件log4net_config.xml

View Code

<? xml version="1.0" encoding="utf-8" ?>
< log4net >
     < appender name ="TastInfo" type ="log4net.Appender.RollingFileAppender" >
         < file value ="Log\\Info\\" />
         < appendToFile value ="true" />
         < rollingStyle value ="Composite" />
         < maxSizeRollBackups value ="-1" />
         < maximumFileSize value ="1MB" />
         < staticLogFileName value ="false" />
         < DatePattern value ="yyyy-MM-dd".txt"" />
         < layout type ="log4net.Layout.PatternLayout" >
             < conversionPattern value ="%date  %-5level  - %message%newline" />
         </ layout >
     </ appender >
     < appender name ="TastError" type ="log4net.Appender.RollingFileAppender" >
         < file value ="log\\Error\\" />
         < appendToFile value ="true" />
         < rollingStyle value ="Composite" />
         < maxSizeRollBackups value ="-1" />
         < maximumFileSize value ="1MB" />
         < staticLogFileName value ="false" />
         < DatePattern value ="yyyy-MM-dd".txt"" />
         < layout type ="log4net.Layout.PatternLayout" >
             < conversionPattern value ="%date  %-5level - %message%newline" />
         </ layout >
     </ appender >
     < appender name ="TastDebug" type ="log4net.Appender.RollingFileAppender" >
         < file value ="log\\Debug\\" />
         < appendToFile value ="true" />
         < rollingStyle value ="Composite" />
         < maxSizeRollBackups value ="-1" />
         < maximumFileSize value ="1MB" />
         < staticLogFileName value ="false" />
         < DatePattern value ="yyyy-MM-dd".txt"" />
         < layout type ="log4net.Layout.PatternLayout" >
             < conversionPattern value ="%date  %-5level - %message%newline" />
         </ layout >
     </ appender >
     < logger name ="Info" >
         < level value ="ALL" />
         < appender-ref ref ="Info" />
         < appender-ref ref ="TastInfo" />
     </ logger >
     < logger name ="Error" >
         < level value ="ALL" />
         < appender-ref ref ="Error" />
         < appender-ref ref ="TastError" />
     </ logger >
     < logger name ="Debug" >
         < level value ="ALL" />
         < appender-ref ref ="Debug" />
         < appender-ref ref ="TastDebug" />
     </ logger >
</ log4net >

log4net的應用錯誤代碼：

View Code

public class Log
    {
         private static string DefaultName = " log ";

         static Log()
        {
             string path = AppDomain.CurrentDomain.BaseDirectory + @" \log4net_config.xml ";
            log4net.Config.XmlConfigurator.Configure( new FileInfo(path));
        }

         public static log4net.ILog GetLog( string logName)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(logName);
             return log;
        }

         public static void debug( string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsDebugEnabled)
                log.Debug(message);

            log = null;
        }

         public static void debug( string message, Exception ex)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsDebugEnabled)
                log.Debug(message, ex);

            log = null;
        }

         public static void error( string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsErrorEnabled)
                log.Error(message);

            log = null;
        }

         public static void error( string message, Exception ex)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsErrorEnabled)
                log.Error(message, ex);

            log = null;
        }

         public static void fatal( string message)
        {

            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsFatalEnabled)
                log.Fatal(message);

            log = null;
        }

         public static void info( string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsInfoEnabled)
                log.Info(message);

            log = null;
        }

         public static void warn( string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsWarnEnabled)
                log.Warn(message);

            log = null;
        }
    }

不輸出日志的原因是因為, 默認private static string DefaultName = "log"，在配置文件里面找不到對應的節點值。

正確的應用代碼：

View Code

public class Log
    {
         private const string SError = " Error ";
         private const string SDebug = " Debug ";
         private const string DefaultName = " Info ";

         static Log()
        {
             var path = AppDomain.CurrentDomain.BaseDirectory + @" \log4net_config.xml ";
            log4net.Config.XmlConfigurator.Configure( new FileInfo(path));
        }

         public static log4net.ILog GetLog( string logName)
        {
             var log = log4net.LogManager.GetLogger(logName);
             return log;
        }

         public static void Debug( string message)
        {
             var log = log4net.LogManager.GetLogger(SDebug);
             if (log.IsDebugEnabled)
                log.Debug(message);
        }

         public static void Debug( string message, Exception ex)
        {
             var log = log4net.LogManager.GetLogger(SDebug);
             if (log.IsDebugEnabled)
                log.Debug(message, ex);
        }

         public static void Error( string message)
        {
             var log = log4net.LogManager.GetLogger(SError);
             if (log.IsErrorEnabled)
                log.Error(message);
        }

         public static void Error( string message, Exception ex)
        {
             var log = log4net.LogManager.GetLogger(SError);
             if (log.IsErrorEnabled)
                log.Error(message, ex);
        }

         public static void Fatal( string message)
        {
             var log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsFatalEnabled)
                log.Fatal(message);
        }

         public static void Info( string message)
        {
            log4net.ILog log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsInfoEnabled)
                log.Info(message);
        }

         public static void Warn( string message)
        {
             var log = log4net.LogManager.GetLogger(DefaultName);
             if (log.IsWarnEnabled)
                log.Warn(message);
        }
    }

總結： log4net.LogManager.GetLogger（Name），這里面的Name要在配置文件中，有對應的節點值。

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