以EventLogEntryCollection的Count方式来进行计数，发现最新日志数量比第一次读取的日志数量多了就顺序读取，少了则代表日志重置，从新读取

    while (1)
    {
        //应用日志实时读取
        log->Log = ("Application");
        EventLogEntryCollection^ myApplication = log->Entries;
        if (myApplication->Count > AppliNum)  //如有新日志，则按序输出
        {
            const char* Message = (const char*)(Marshal::StringToCoTaskMemAnsi(myApplication[AppliNum]->Message)).ToPointer();
            const char* TimeWritten = (const char*)(Marshal::StringToCoTaskMemAnsi(myApplication[AppliNum]->TimeWritten.ToString())).ToPointer();
            string Msg = Message;
            string Time = TimeWritten;
            Client(Time, Msg);
            AppliNum++;
        }
        else if (myApplication->Count < AppliNum) //表示日志以重置
        {
            for each (EventLogEntry^ var in myApplication)
            {
                const char* Message = (const char*)(Marshal::StringToCoTaskMemAnsi(var->Message)).ToPointer();
                const char* TimeWritten = (const char*)(Marshal::StringToCoTaskMemAnsi(var->TimeWritten.ToString())).ToPointer();
                string Msg = Message;
                string Time = TimeWritten;
                Client(Time, Msg);
            }
            AppliNum = myApplication->Count;
        }
}

这个应该没有异步通知的方式，你可以开个线程，周期性的调用上面的函数，来达到实时的目的

你这是用的是C#的EventLog类啊