让Log4Net 立即写日志文件

         Log4Net会将日志缓冲到内存, app退出时才会写入磁盘, 但调试阶段常常希望在app运行时即时看到产生的日志, 这时候需要在配置里面增加ImmediateFlush参数 :

<?xml version="1.0" encoding="utf-8"?><configuration><configSections>    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >        <section name="SerialBarcode.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />            </sectionGroup>    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /></configSections><startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/></startup>    <userSettings>        <SerialBarcode.Properties.Settings>            <setting name="user" serializeAs="String">                <value>postgres</value>            </setting>            <setting name="port" serializeAs="String">                <value>5432</value>            </setting>            <setting name="host" serializeAs="String">                <value>xxxx</value>            </setting>            <setting name="pass" serializeAs="String">                <value>password</value>            </setting>            <setting name="database" serializeAs="String">                <value>xxxxdb</value>            </setting>        </SerialBarcode.Properties.Settings>            </userSettings>  <log4net>    <!--定义输出到文件中-->    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">      <!--定义文件存放位置-->      <file value="log\\"/>      <appendToFile value="true"/>      <rollingStyle value="Date"/>      <datePattern value="yyyyMM\\yyyyMMdd'.txt'"/>      <staticLogFileName value="false"/>        <param name="ImmediateFlush" value="true" />       <param name="MaxSizeRollBackups" value="100"/>      <layout type="log4net.Layout.PatternLayout">        <!--每条日志末尾的文字说明-->        <!--输出格式-->        <!--样例：2008-03-26 13:42:32,111 [10] INFO  Log4NetDemo.MainClass [(null)] - info-->        <conversionPattern value="%newline %n记录时间：%date %n线程ID:[%thread] %n日志级别：  %-5level %n出错类：%logger property: [%property{NDC}] - %n错误描述：%message%newline %n"/>      </layout>    </appender>    <root>      <level value="DEBUG"/>      <!--文件形式记录日志-->      <appender-ref ref="RollingLogFileAppender"/>    </root>  </log4net></configuration>

发布时需要带上app名.exe.config这个配置文件, 否则log4net则不工作. 若关闭立即写磁盘的功能,则需要将<param name="ImmediateFlush" value="true" />这个注释掉即可 .