环境：Nuget下载并安装log4net不在详细赘述

日志帮助类

public class LogHelper
    {

        /// <summary>
        /// 信息日志
        /// </summary>
        /// <param name="type">当前实例</param>
        /// <param name="message">日志内容</param>
        /// <param name="exception">异常信息</param>
        public static void Info(Type type, object message, Exception exception = null)
        {
            ILog log = LogManager.GetLogger(type);
            if (exception == null)
                log.Info(message);
            else
                log.Info(message, exception);
        }

        /// <summary>
        /// 错误日志
        /// </summary>
        /// <param name="type">当前实例</param>
        /// <param name="message">日志内容</param>
        /// <param name="exception">异常信息</param>
        public static void Error(Type type, object message, Exception exception = null)
        {
            ILog log = LogManager.GetLogger(type);
            if (exception == null)
                log.Error(message);
            else
                log.Error(message, exception);
        }
    }

Web.config配置（也可以是自己新建的config）

在configuration标签内加入

<log4net>
    <appender name="errorAppender" type="log4net.Appender.RollingFileAppender">
      <param name="Encoding" value="utf-8" /> <!--日志编码-->
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="ERROR" />  <!--日志类型-->
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logs\LogError\" /> <!--日志路径-->
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd&quot;.log&quot;" /> <!--日志文件名称（按日期记录）-->
      <StaticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <appender name="infoAppender" type="log4net.Appender.RollingFileAppender">
      <param name="Encoding" value="utf-8" />
      <filter type="log4net.Filter.LevelMatchFilter">
        <levelToMatch value="INFO" />
      </filter>
      <filter type="log4net.Filter.DenyAllFilter" />
      <File value="Logs\LogInfo\" />
      <appendToFile value="true" />
      <rollingStyle value="Date" />
      <datePattern value="yyyyMMdd&quot;.log&quot;" />
      <StaticLogFileName value="false" />
      <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%date [%thread] %-5level %logger - %message%newline" />
      </layout>
    </appender>
    <root>
      <level value="ALL" />
      <appender-ref ref="errorAppender" />
      <appender-ref ref="infoAppender" />
    </root>
  </log4net>

AssemblyInfo.cs配置（安装log4net默认就有 不用新建）

底部加入

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

注意：ConfigFile可以指定新建的config名称

使用方法：

            try
            {
                ///正常代码写入
                LogHelper.Info(this.GetType(), "admin-登录");
            }
            catch(Exception ex)
            {
                ///异常代码写入
                LogHelper.Error(this.GetType(), ex);
            }

效果查看：项目根目录下Logs文件夹里

原文链接：https://www.idaobin.com/archives/2049.html

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