1.NuGet 安装Log4Net.
2.新建一个Common的project，并且添加一个LogWriter的类：
public class LogWriter
{
//Error log
public static void Error(Exception ex)
{
LogHelper.GetInstanse().Logger.Error(string.Format("{0} - {1}", ex.Message, ex.StackTrace));
}
public static void Error(string message, Exception ex)
{
LogHelper.GetInstanse().Logger.Error(message, ex);
}
//Info Log
public static void Info(string message)
{
LogHelper.GetInstanse().Logger.Info(message);
}
public static void Info(string format, params object[] args)
{
LogHelper.GetInstanse().Logger.InfoFormat(format, args);
}
//Debug log
public static void Debug(string message)
{
LogHelper.GetInstanse().Logger.Debug(message);
} public static void Debug(string format, params object[] args)
{
LogHelper.GetInstanse().Logger.DebugFormat(format, args);
} }
class LogHelper
{
private static LogHelper _logHelper = null;
private static ILog _logger = null;
private static readonly object syncRoot = new object();
public LogHelper()
{
var logCfg = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + @"\App_Config\Log4Net.config");
log4net.Config.XmlConfigurator.Configure(logCfg);
_logger = LogManager.GetLogger(ConfigurationManager.AppSettings["LoggerName"]);
}
public static LogHelper GetInstanse()
{
if (_logHelper == null)
{
lock (syncRoot)
{
if (_logHelper == null)
{
_logHelper = new LogHelper();
}
}
}
return _logHelper;
}
public ILog Logger
{
get
{
return _logger;
}
}
}
3.在需要使用LogWriter的project中新建App_Config文件夹，加入配置文件：
Log4Net.config
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<root>
<!--
<level value="ALL" />
<appender-ref ref="rootFile" />
-->
</root>
<logger name="TestLog">
<level value="ALL" />
<appender-ref ref="DebugLoging"/>
<appender-ref ref="InfoLoging" />
<appender-ref ref="ErrorLoging" />
</logger>
<appender name="DebugLoging" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="_LogData\log_debug" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="yyyyMMdd".log"" />
<param name="AppendToFile" value="true" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="DEBUG" />
<param name="LevelMax" value="DEBUG" />
</filter>
</appender>
<appender name="InfoLoging" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="_LogData\log_Info" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="yyyyMMdd".log"" />
<param name="AppendToFile" value="true" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="INFO" />
<param name="LevelMax" value="INFO" />
</filter>
</appender>
<appender name="ErrorLoging" type="log4net.Appender.RollingFileAppender,log4net" >
<param name="File" value="_LogData\log_error" />
<param name="RollingStyle" value="Date" />
<param name="DatePattern" value="yyyyMMdd".log"" />
<param name="AppendToFile" value="true" />
<layout type="log4net.Layout.PatternLayout,log4net">
<param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss}%newline%message%n" />
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="ERROR" />
<param name="LevelMax" value="ERROR" />
</filter>
</appender>
<appender name="ADONetAppender" type="log4net.Appender.ADONetAppender">
<bufferSize value="" />
<connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<connectionString value="" />
<commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
<parameter>
<parameterName value="@log_date" />
<dbType value="DateTime" />
<layout type="log4net.Layout.RawTimeStampLayout" />
</parameter>
<parameter>
<parameterName value="@thread" />
<dbType value="String" />
<size value="" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%t" />
</layout>
</parameter>
<parameter>
<parameterName value="@log_level" />
<dbType value="String" />
<size value="" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%p" />
</layout>
</parameter>
<parameter>
<parameterName value="@logger" />
<dbType value="String" />
<size value="" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%logger" />
</layout>
</parameter>
<parameter>
<parameterName value="@message" />
<dbType value="String" />
<size value="" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%m" />
</layout>
</parameter>
<parameter>
<parameterName value="@exception" />
<dbType value="String" />
<size value="" />
<layout type="log4net.Layout.ExceptionLayout" />
</parameter>
</appender>
</log4net>
配置文件可以配置log 类型，info, error debug。
保存路径，保存方式（文件和数据库，若是数据库要填写connectstring）
4.在web.config/app.config中配置log的名称，这里是TestLog，和上面的log 配置文件保持一致。
<add key="LoggerName" value="TestLog" />
5.使用：
LogWriter.Error("Error occurs", e);e 是exception 对象；
LogWriter.Info("Test log feature.");
6.在路径_LogData下就会按照每天产生对应的log