C#实现Log4Net日志分类和自动维护实例

public static ILog GetLogger(string repositoryName = "")
{
    if (string.IsNullOrEmpty(repositoryName)) return LogManager.GetLogger("Defalut");

    ILoggerRepository repository = null;
    try
    {
 repository = LogManager.GetRepository(repositoryName);
    }
    catch (Exception) { }

    //找到直接返回ilog
    if (repository != null)
 return LogManager.GetLogger(repositoryName, "Defalut");

    //未找到则创建，多线程下很有可能创建时，就存在了
    try
    {
 repository = LogManager.CreateRepository(repositoryName);
    }
    catch (Exception)
    {
 repository = LogManager.GetRepository(repositoryName);
    }

    //配置日志等级  读取Appsettings默认配置 
    var appSet = ConfigurationManager.AppSettings.AllKeys;

    //查找日志等级
    const string logLevel = "LogLevel";
    var hasSettings = Array.IndexOf(appSet, logLevel);
    if (hasSettings > -1)
    {
 var level = ConfigurationManager.AppSettings[logLevel].ToLower();
 if (level == "all") repository.Threshold = Level.All;
 else if (level == "debug") repository.Threshold = Level.Debug;
 else if (level == "info") repository.Threshold = Level.Info;
 else if (level == "warn") repository.Threshold = Level.Warn;
 else if (level == "error") repository.Threshold = Level.Error;
 else if (level == "fatal") repository.Threshold = Level.Fatal;
 else if (level == "off") repository.Threshold = Level.Off;
    }
    else repository.Threshold = Level.All;

    //查找输出Appender
    const string logAppender = "LogAppender";
    hasSettings = Array.IndexOf(appSet, logAppender);
    if (hasSettings > -1)
    {
 var appenders = ConfigurationManager.AppSettings[logAppender].ToLower().Split(',');
 foreach (var appender in appenders)
 {
     if (appender == "rollingfile") LoadRollingFileAppender(repository);
     else if (appender == "console") LoadConsoleAppender(repository);
     else if(appender == "trace") LoadTraceAppender(repository);
 }
    }
    else LoadRollingFileAppender(repository);

    return LogManager.GetLogger(repositoryName, "Default");
}

<!--RollingFileAppender:输出到文件中-->
<appender name="SysAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志的路径-->
      <file value="Logs/" />
      <!--是否覆盖，默认是追加true-->
      <appendToFile value="true"/>
      <!--不占用日志文件进程-->
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <rollingStyle value="Composite"/>
      <!--文件名称-->
      <DatePattern value="yyyy-MM-dd HH'时.log'"></DatePattern>
      <!--设置无限备份=-1 ，最大备份数为1000-->
      <param name="MaxSizeRollBackups" value="1000"/>
      <!--每个文件的大小-->
      <param name="MaximumFileSize" value="500KB"/>
      <!--名称是否可以更改 为false为可以更改-->
      <param name="StaticLogFileName" value="false"/>
      <layout type="log4net.Layout.PatternLayout">
        <!--输出格式-->
        <conversionPattern value="%n【记录时间】%date%n【描述】%message%n"/>
      </layout>
</appender>

<!--RollingFileAppender:输出到文件中-->
<appender name="SysAppender" type="log4net.Appender.RollingFileAppender">
      <!--日志的路径-->
      <file value="Logs/日志.log" />
      <!--是否覆盖，默认是追加true-->
      <appendToFile value="true"/>
      <!--不占用日志文件进程-->
      <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
      <rollingStyle value="Composite"/>
      <!--文件名称-->
      <DatePattern value="yyyy-MM-dd HH'时.log'"></DatePattern>
      <!--设置无限备份=-1 ，最大备份数为1000-->
      <param name="MaxSizeRollBackups" value="1000"/>
      <!--每个文件的大小-->
      <param name="MaximumFileSize" value="500KB"/>
      <!--名称是否可以更改 为false为可以更改-->
      <param name="StaticLogFileName" value="true"/>
      <layout type="log4net.Layout.PatternLayout">
        <!--输出格式-->
        <conversionPattern value="%n【记录时间】%date%n【描述】%message%n"/>
      </layout>
</appender>