public interface ILogger

{}

public interface ILoggerWrapper

{

    ILogger Logger  {get;}

}

public interface ILog : IloggerWrapper  //继承IloggerWrapper 这个接口

{

     bool IsErrorEnabled  {get;}

     void Error(object message);

}

public class SysLog

{

    public static readonly ILog logerror;// 创建ILog对象,

    static SysLog() //构造函数

    {

        if (logerror == null)

        {

            logerror = LogManager.GetLogger("logerror");

        }

    }

    public static void WriteErrorLog(string info)

    {

        if (logerror.IsErrorEnabled)  // logerror

        {

            logerror.Error(info);  /  //////这代码 有啥作用?????

        }

    }

}