MVCApplication---Application_Statr--RegisterRoutes--给RouteCollection添加规则，请求进到网站---X----请求地址被路由按照顺序匹配，遇到一个温和的就结束，就到对应的控制器和action。

在程序中使用log4net，首先nuget引入程序集

 

 Logger代码

public class Logger
{
    static Logger()
    {
        XmlConfigurator.Configure(new FileInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "CfgFiles\\log4net.config")));
        ILog Log = LogManager.GetLogger(typeof(Logger));
        Log.Info("系统初始化Logger模块");
    }

    private ILog loger = null;
    public Logger(Type type)
    {
        loger = LogManager.GetLogger(type);
    }

    /// <summary>
    /// Log4日志
    /// </summary>
    /// <param name="msg"></param>
    /// <param name="ex"></param>
    public void Error(string msg = "出现异常", Exception ex = null)
    {
        Console.WriteLine(msg);
        loger.Error(msg, ex);
    }

    /// <summary>
    /// Log4日志
    /// </summary>
    /// <param name="msg"></param>
    public void Warn(string msg)
    {
        Console.WriteLine(msg);
        loger.Warn(msg);
    }

    /// <summary>
    /// Log4日志
    /// </summary>
    /// <param name="msg"></param>
    public void Info(string msg)
    {
        Console.WriteLine(msg);
        loger.Info(msg);
    }

    /// <summary>
    /// Log4日志
    /// </summary>
    /// <param name="msg"></param>
    public void Debug(string msg)
    {
        Console.WriteLine(msg);
        loger.Debug(msg);
    }

}

配置文件log4net.config

<?xml version="1.0" encoding="utf-8"?>
<log4net>
    <!-- Define some output appenders -->
    <appender name="rollingAppender" type="log4net.Appender.RollingFileAppender">
        <file value="log\log.txt" />

        <!--追加日志内容-->
        <appendToFile value="true" />

        <!--防止多线程时不能写Log,官方说线程非安全-->
        <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />

        <!--可以为:Once|Size|Date|Composite-->
        <!--Composite为Size和Date的组合-->
        <rollingStyle value="Composite" />

        <!--当备份文件时,为文件名加的后缀-->
        <datePattern value="yyyyMMdd.TXT" />

        <!--日志最大个数,都是最新的-->
        <!--rollingStyle节点为Size时,只能有value个日志-->
        <!--rollingStyle节点为Composite时,每天有value个日志-->
        <maxSizeRollBackups value="20" />

        <!--可用的单位:KB|MB|GB-->
        <maximumFileSize value="3MB" />

        <!--置为true,当前最新日志文件名永远为file节中的名字-->
        <staticLogFileName value="true" />

        <!--输出级别在INFO和ERROR之间的日志-->
        <filter type="log4net.Filter.LevelRangeFilter">
            <param name="LevelMin" value="INFO" />
            <param name="LevelMax" value="FATAL" />
        </filter>

        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%date [%thread] %-5level %logger - %message%newline"/>
        </layout>
    </appender>

    <!-- levels: OFF > FATAL > ERROR > WARN > INFO > DEBUG  > ALL -->
    <root>
        <priority value="ALL"/>
        <level value=&quo