1、引入log4net.dll

1.1 Nuget安装 或 http://logging.apache.org/log4net/下载log4net的源代码，编译后把log4net.dll引入项目。

2、配置log4net.config

2.1 在Web.config文件中进行添加configSections的节点

  <configSections>

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

  </configSections>

2.2 添加log4net.config（设置为始终复制到输出目录）

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <log4net>

    <!-- 信息日志类 -->

    <logger name="loginfo">

      <level value="ALL" />

      <appender-ref ref="InfoAppender" />

    </logger>

    <!-- 信息日志附加介质 -->

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

      <!-- 输出到什么目录 -->

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

      <!-- 是否覆写到文件中 -->

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

      <!-- 备份文件的个数 -->

      <param name="MaxSizeRollBackups" value="50" />

      <!-- 单个日志文件最大的大小 -->

      <param name="MaxFileSize" value="10240" />

      <!-- 是否使用静态文件名 -->

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

      <!-- 日志文件名 -->

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

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

      <!-- 布局，更多参数可参照官网说明 -->

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

        <param name="ConversionPattern" value="&lt;HR COLOR=red&gt;

          %n级别：%-5p &lt;BR&gt;

          %n时间：%d [%t] &lt;BR&gt;

          %n描述：%m &lt;BR&gt;"/>

      </layout>

    </appender>

  </log4net>

</configuration>

2.3 在AssemblyInfo.cs文件中指定配置log4net.config

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

2.4 若项目为B/S结构，还需在Global.asax文件中添加如下配置

log4net.Config.XmlConfigurator.Configure();

3、代码使用示例

3.1 封装工具类LogHelper

namespace July.Demo.Win

{

    public class LogHelper

    {

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

        public static void WriteLog(string info)

        {

            if (loginfo.IsInfoEnabled)

            {

                loginfo.Info(info);

            }

        }

    }

}

3.2 使用示例

private void Form1_Load(object sender, EventArgs e)

{

    LogHelper.WriteLog("窗体生成");

}

4、运行结果

4.1 效果图如下

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" 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