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