求代码结构,该怎么处理

static void Main()        {            ForumPost_xmfish fish = new ForumPost_xmfish();            ForumManage manage = new ForumManage();            manage.AAA(fish, "", "", "", "", "");}    public class ForumManage    {        string title;        string content;        ForumPostBase catcher;        public bool  AAA(ForumPostBase fpost, string title  ,string content, string zhanghao , string mima, string fid)        {            return fpost.Post(title,content,fid);        }    }public class ForumPostBase    {        public string forumName;        public string forumSite;        public bool Post(string title, string content, string fid)        {            string aa = ""; //断点， 程序会进入这里；            return true;        }    }public class ForumPost_xmfish : ForumPostBase    {        public string forumName = "厦门小鱼论坛";        public string forumSite = "www.xmfish.com";        public virtual bool Post(string title, string content, string fid)        {            string aaa = "";   // 断点， 程序不会进入这， 但是我希望是执行POST方法的时候， 能到这来            return true;        }    }