C# 添加log4net日志

一、添加log4net的Nuget包

二、在Web.config或者App.config文件中添加log4net配置

代码：

<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

<log4net>

    <!-- OFF, FATAL, ERROR, WARN, INFO, DEBUG, ALL -->

    <!-- Set root logger level to ERROR and its appenders -->

    <!--<root>

      <level value="ALL" />

      <appender-ref ref="SysAppender" />

    </root>

    -->

    <!--Error日志-->

    <logger name="LogError">

      <level value="ERROR" />

      <appender-ref ref="RollingLogFileAppender" />

    </logger>

    <!--Info日志-->

    <logger name="LogInfo">

      <level value="INFO" />

      <appender-ref ref="InfoAppender" />

    </logger>

    <!--错误日志-->

    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">

      <file value="log\\LogError\\" />

      <appendToFile value="true" />

      <rollingStyle value="Date" />

      <datePattern value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" />

      <staticLogFileName value="false" />

      <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="%date [%thread] %-5level %logger - %message%newline" />

      </layout>

    </appender>

    <!--Info日志-->

    <appender name="InfoAppender" type="log4net.Appender.RollingFileAppender">

      <param name="File" value="Log\\LogInfo\\" />

      <param name="AppendToFile" value="true" />

      <param name="StaticLogFileName" value="false" />

      <param name="DatePattern" value="&quot;Logs_&quot;yyyyMMdd&quot;.txt&quot;" />

      <param name="RollingStyle" value="Date" />

      <layout type="log4net.Layout.PatternLayout">

        <conversionPattern value="%d [%t] %-5p %c - %m%n" />

      </layout>

    </appender>

  </log4net>

三、在Global.asax全局文件中设置log4net使用的配置文件

代码：

log4net.Config.XmlConfigurator.Configure(new System.IO.FileInfo(Server.MapPath("~/Web.config")));

四、为了方便调用可以加个Help类

public class Logger

    {

        public static readonly log4net.ILog loginfo = log4net.LogManager.GetLogger("LogInfo");

        public static readonly log4net.ILog logerror = log4net.LogManager.GetLogger("LogError");

        /// <summary>

        /// 记录Info日志

        /// </summary>

        /// <param name="info"></param>

        public static void Info(string info)

        {

            if (loginfo.IsInfoEnabled)

            {

                loginfo.Info(info);

            }

        }

        /// <summary>

        /// 记录Error日志

        /// </summary>

        /// <param name="errorMsg"></param>

        /// <param name="ex"></param>

        public static void ErrorLog(string errorMsg, Exception ex = null)

        {

            if (logerror.IsErrorEnabled)

            {

                logerror.Error(errorMsg, ex);

            }

        }

    }

接下来就可以使用了