log4net 使用

1：创建log4net 配置文件log4net.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
    </configSections>

    <log4net>
        <!-- 将日志写入到本地txt文件中 -->
        <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
            <!--日志路径-->
            <param name= "File" value= "logs"/>
            <!--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 HH'.log'"/>
            <!--日志根据日期滚动-->
            <param name= "RollingStyle" value= "Date"/>
            <layout type="log4net.Layout.PatternLayout">
                <param name="ConversionPattern" value="%n%d 耗时%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
            </layout>
        </appender>

        <!-- 控制台前台显示日志 -->
        <!--<appender name="ColoredConsoleAppender" type="log4net.Appender.ColoredConsoleAppender">
            <mapping>
                <level value="ERROR" />
                <foreColor value="Red" />
            </mapping>
            <mapping>
                <level value="WARN" />
                <foreColor value="Yellow" />
            </mapping>
            <mapping>
                <level value="INFO" />
                <foreColor value="White" />
            </mapping>
            <mapping>
                <level value="DEBUG" />
                <foreColor value="Blue" />
            </mapping>
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%n%d 程序运行时间:%r毫秒 进程ID:%t 行号:%L 当前日志对象名称:%c 日志当前级别:%p 输出语句所在文件名:%F 日志消息:%m" />
            </layout>
            <filter type="log4net.Filter.LevelRangeFilter">
                <param name="LevelMin" value="Info" />
                <param name="LevelMax" value="Fatal" />
            </filter>
        </appender>-->

        <!-- 将日志写入到SQLServer中 -->
        <!--<appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
            <bufferSize value="1" />
            <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <connectionString value="data source=.\MSSQL2008R2;initial catalog=MeiTuan;integrated security=false;persist security info=True;User ID=sa;Password=111111" />
            <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="255" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%thread" />
                </layout>
            </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="@logger" />
                <dbType value="String" />
                <size value="255" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%logger" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@message" />
                <dbType value="String" />
                <size value="4000" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%message" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@exception" />
                <dbType value="String" />
                <size value="2000" />
                <layout type="log4net.Layout.ExceptionLayout" />
            </parameter>
        </appender>-->

        <root>
            <!--(高) OFF > FATAL > ERROR > WARN > INFO > DEBUG > ALL (低) -->
            <level value="all" />
            <!--<appender-ref ref="ColoredConsoleAppender"/>-->
            <appender-ref ref="RollingLogFileAppender"/>
            <!--<appender-ref ref="AdoNetAppender"/>-->
        </root>
    </log4net>
</configuration>

2:公共日志类：

public class Log4netHelper
    {
        private static readonly log4net.ILog logger = log4net.LogManager.GetLogger("Logger"); //这里的 Logger 和 log4net.config 里的名字要一样
        public static void Info(string message)
        {
            if (logger.IsInfoEnabled)
            {
                logger.Info(message);
            }
        }
        public static void Info(string message, Exception ex)
        {
            if (logger.IsInfoEnabled)
            {
                logger.Info(message, ex);
            }
        }

        public static void Debug(string message)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Debug(message);
            }
        }
        public static void Debug(string message, Exception ex)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Warn(message, ex);
            }
        }

        public static void Warn(string message)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Warn(message);
            }
        }
        public static void Warn(string message, Exception ex)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Warn(message, ex);
            }
        }

        public static void Error(string message)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Error(message);
            }
        }
        public static void Error(string message, Exception ex)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Error(message, ex);
            }
        }

        public static void Fatal(string message)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Fatal(message);
            }
        }
        public static void Fatal(string message, Exception ex)
        {
            if (logger.IsErrorEnabled)
            {
                logger.Fatal(message, ex);
            }
        }
    }

3：Assemblyinfor 文件中添加如下代码

　　[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config", ConfigFileExtension = "config", Watch = true)]

　　注:
　　1:log4net.config 文件必须放在客户端项目中，web项目放在web页面层
　　2;logger.IsErrorEnabled,IsInfoEnabled,IsDebugEnabled,IsWarnEnabled,IsFatalEnabled 等属性要起作用，必须将log4net.config 文件的设置为始终复制或者如果较新则复制