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1.通过管理NuGet程序包 引入log4net.dll程序集

3.新建公共方法类Log4NetHelper

public class Log4NetHelper    {
           private static readonly ILog Loginfo = LogManager.GetLogger("InfoLog");        private static readonly ILog Logwarn = LogManager.GetLogger("Warn");        private static readonly ILog Logerror = LogManager.GetLogger("ErrorLog");        private static readonly ILog Logfatal = LogManager.GetLogger("Fatal");        static Log4NetHelper()        {
               var configFile = HostingEnvironment.MapPath("/App_Data/Log4netConfig.xml");            log4net.Config.XmlConfigurator.Configure(new FileInfo(configFile));            //log4net.Config.XmlConfigurator.Configure();        }         private static string GetMethodInfo()        {
               StackTrace ss = new StackTrace(true);            //index:0为本身的方法；1为调用方法；2为其上上层，依次类推            MethodBase mb = ss.GetFrame(2).GetMethod();            string systemModule =                $"{Environment.NewLine}模块名:{mb.Module}{Environment.NewLine}命名空间名:{mb.DeclaringType?.Namespace}{Environment.NewLine}类名:{mb.DeclaringType?.Name}{Environment.NewLine}方法名:{mb.Name}";            return systemModule;        }                public static void Info(string msg)        {
               Loginfo.Info($"{GetMethodInfo()}——{msg}");        }                public static void Error(string msg)        {
               Logerror.Error($"{GetMethodInfo()}——{msg}");       }         }        }

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