<?xml version="1.0" encoding="utf-8" ?>
<log4net>
    <appender name="DefaultAppender" type="log4net.Appender.RollingFileAppender">
        <file value="LogFiles/Root1/"/>　<!--存放log路徑-->
        <staticLogFileName value="false"/>
        <appendToFile value="true"/>
        <rollingStyle value="Date"/>
        <datePattern value="yyyy-MM-dd.log"/>　<!--log檔的命名-->
        <layout type="log4net.Layout.PatternLayout">
        <!--內容格式-->
        <conversionPattern value="%-5p %date{yyyy/MM/dd HH:mm:ss} %-20c{1} %-20M %m%n" />
        </layout>
    </appender>
    <root>
        <level value="ALL"/>
        <appender-ref ref="DefaultAppender"/>
    </root>
</log4net>

public class LogAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        var instanceType = actionContext.ControllerContext.Controller.GetType();
        ILog log = LogManager.GetLogger("Web");
        string method = $"{instanceType.FullName}.{actionContext.ActionDescriptor.ActionName}";
        string attributeMethod = $"{method}.OnActionExecuting";

        log.Debug($"Method：{method}，AttributeMethod：{attributeMethod}，Message：Debug");
    }
}