事件模式实现通知

      
        class
      
       LoggerClass
      

          {
      

          }
      

      
        public
      
      
        class
      
       LoggerEventArgs : EventArgs
      

          {
      

      
        public
      
      
        string
      
       Message { 
      
        get
      
      ; 
      
        private
      
      
        set
      
      ; }
      

      
        public
      
      
        int
      
       Priority { 
      
        get
      
      ; 
      
        private
      
      
        set
      
      ; }
      

      
        public
      
       LoggerEventArgs(
      
        int
      
       priority,
      
        string
      
        msg)
      

              {
      

                  Priority = priority;
      

                  Message = msg;
      

      

              }
      

      

          }
      

      
        public
      
      
        static
      
      
        struct
      
       LogerEventName
      

          {
      

      
        public
      
      
        static
      
      
        readonly
      
      
        string
      
       OnError = 
      
        "
      
      
        OnError
      
      
        "
      
      ;
      

      
        public
      
      
        static
      
      
        readonly
      
      
        string
      
       OnFail = 
      
        "
      
      
        OnFail
      
      
        "
      
      ;
      

      
        public
      
      
        static
      
      
        readonly
      
      
        string
      
       OnWaring = 
      
        "
      
      
        OnWaring
      
      
        "
      
      ;
      

      

          }
      

      

      
        public
      
      
        sealed
      
      
        class
      
       Logger
      

          {
      

      
        private
      
      
        static
      
       Dictionary<
      
        string
      
      , EventHandler<LoggerEventArgs>> Handers = 
      
        new
      
       Dictionary<
      
        string
      
      , EventHandler<LoggerEventArgs>>();
      

      
        public
      
      
        static
      
      
        void
      
       AddLoger(
      
        string
      
       system,EventHandler<LoggerEventArgs> ev)
      

              {
      

      
        if
      
       (Handers.ContainsKey(system))
      

                  {
      

                      Handers[system] += ev;
      

                  }
      

      
        else
      
      

                  {
      

                      Handers.Add(system,ev);
      

                  }
      

              }
      

      
        public
      
      
        static
      
      
        void
      
       RemoveLogger(
      
        string
      
       system,EventHandler<LoggerEventArgs> ev)
      

              { 
      

      
        if
      
       (Handers.ContainsKey(system))
      

                  {
      

                      Handers[system] -= ev;
      

                  }
      

              }
      

      

      
        public
      
      
        static
      
      
        void
      
       AddMsg(
      
        string
      
       sytem,
      
        int
      
       priority,
      
        string
      
       msg)
      

              {
      

      
        if
      
       (
      
        string
      
      .IsNullOrEmpty(sytem) || !Handers.ContainsKey(sytem))
      

      
        return
      
      ;
      

                  LoggerEventArgs args = 
      
        new
      
       LoggerEventArgs(priority,msg);
      

                  EventHandler<LoggerEventArgs> eventthander = 
      
        null
      
      ;
      

                  Handers.TryGetValue(sytem, 
      
        out
      
       eventthander);
      

      
        if
      
       (eventthander != 
      
        null
      
      )
      

                      eventthander(
      
        null
      
      , args);
      

              }
      

          }