C# log4net 日志输出的实现示例

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
	<configSections>
		<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
	</configSections>
	<log4net>
		<!--level取值：OFF FATAL ERROR WARN INFO DEBUG ALL -->
		<logger name="loginfo">
			<level value="ALL"/>
			<appender-ref ref="InfoAppender"/>
		</logger>
		<appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">
			<param name="File" value="log\\"/>
			<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
			<param name="AppendToFile" value="true"/>
			<param name="MaxFileSize" value="10240"/>
			<param name="StaticLogFileName" value="false"/>
			<param name="DatePattern" value="yyyy-MM-dd&quot;.txt&quot;"/>
			<param name="RollingStyle" value="Date"/>
			<layout type="log4net.Layout.PatternLayout">
				<param name="ConversionPattern" value="%d [%p] - %m%n"/>
			</layout>
		</appender>
	</log4net>
</configuration>

LogUtils.SetConfig(new FileInfo(Application.StartupPath + @"\log4net.config"));

class LogUtils
{
	private static readonly ILog loginfo = LogManager.GetLogger("loginfo");

	/// <summary>
	/// 从缺省配置文件获取日志配置
	/// </summary>
	public static void SetConfig()
	{
		XmlConfigurator.Configure();
	}

	/// <summary>
	/// 从指定配置文件获取日志配置
	/// </summary>
	/// <param name="configFile">指定的配置文件</param>
	public static void SetConfig(FileInfo configFile)
	{
		XmlConfigurator.Configure(configFile);
	}

	/// <summary>
	/// 生成分类日志
	/// </summary>
	/// <param name="info">日志信息</param>
	/// <param name="dirName">保存目录名,形如d:\log\aaa</param>
	private static void WriteSortLog(string info, string dirName)
	{
		try
		{
			if (false == System.IO.Directory.Exists(dirName))
			{
				System.IO.Directory.CreateDirectory(dirName);
			}
			string path = dirName + "\\" + DateTime.Now.ToString("yyyyMMdd") + ".txt";
			StreamWriter sw = new StreamWriter(path, true, System.Text.Encoding.Default);
			sw.WriteLine(DateTime.Now.ToString("HH:mm:ss: ") + info);
			sw.Close();
		}
		catch (Exception ex)
		{
			string expMsg = "WriteSortLog异常：" + ex.Message + Environment.NewLine + ex.StackTrace;

			if (ex.InnerException != null)
				expMsg += Environment.NewLine + "InnerException:" + ex.InnerException.Message;

			Error(expMsg, ex);
		}
	}

	/// <summary>
	/// Info级 常规日志
	/// </summary>
	/// <param name="info">日志信息</param>
	public static void Info(string info)
	{
		if (loginfo.IsInfoEnabled)
		{
			loginfo.Info(info);
		}
	}

	/// <summary>
	/// Info 先生成常规日志，然后在指定目录另外创建一份日志
	/// 主要用来需要对日志进行分类时使用
	/// </summary>
	/// <param name="info"></param>
	/// <param name="dirName"></param>
	public static void Info(string info, string dirName)
	{
		if (loginfo.IsInfoEnabled)
		{
			//生成常规日志
			loginfo.Info(info);

			//生成分类日志
			WriteSortLog(info, dirName);
		}
	}

	/// <summary>
	/// Debug级 常规日志
	/// </summary>
	/// <param name="info">日志信息</param>
	public static void Debug(string info)
	{
		if (loginfo.IsDebugEnabled)
		{
			loginfo.Debug(info);
		}
	}

	/// <summary>
	/// Debug级 异常日志
	/// </summary>
	/// <param name="info">日志信息</param>
	/// <param name="exp">异常信息</param>
	public static void Debug(string info, Exception exp)
	{
		if (loginfo.IsDebugEnabled)
		{
			loginfo.Debug(info, exp);
		}
	}

	/// <summary>
	/// Error级 常规的日志
	/// </summary>
	/// <param name="info">日志信息</param>
	public static void Error(string info)
	{
		if (loginfo.IsErrorEnabled)
		{
			loginfo.Error(info);
		}
	}

	/// <summary>
	/// Error 异常日志
	/// </summary>
	/// <param name="info">日志信息</param>
	/// <param name="exp">异常信息</param>
	public static void Error(string info, Exception exp)
	{
		if (loginfo.IsErrorEnabled)
		{
			loginfo.Error(info, exp);
		}
	}

	/// <summary>
	/// Fatal级 常规日志
	/// </summary>
	/// <param name="info">日志信息</param>
	public static void Fatal(string info)
	{
		if (loginfo.IsFatalEnabled)
		{
			loginfo.Fatal(info);
		}
	}

	/// <summary>
	/// Fatal级 异常日志
	/// </summary>
	/// <param name="info">日志信息</param>
	/// <param name="exp">异常信息</param>
	public static void Fatal(string info, Exception exp)
	{
		if (loginfo.IsFatalEnabled)
		{
			loginfo.Fatal(info, exp);
		}
	}

	/// <summary>
	/// Warn级 常规日志
	/// </summary>
	/// <param name="info">日志信息</param>
	public static void Warn(string info)
	{
		if (loginfo.IsWarnEnabled)
		{
			loginfo.Warn(info);
		}
	}

	/// <summary>
	/// Warn级 异常日志
	/// </summary>
	/// <param name="info">日志</param>
	/// <param name="exp">异常信息</param>
	public static void Warn(string info, Exception exp)
	{
		if (loginfo.IsWarnEnabled)
		{
			loginfo.Warn(info, exp);
		}
	}
}

[assembly: log4net.Config.XmlConfigurator(Watch = true)]

LogUtils.Error(“错误日志”);
LogUtils.Info(“正常输出日志”);
LogUtils.Warn(“温馨提示日志”);