Code
private ?? Load1(int personId)
        {
            //联合查询？ 若有对应关系，则可以不用联合查询 ？
            var q = from a in db.OSC_Visitors
                    from b in db.OSC_Accounts
                    where a.VisitorId == b.PKID && a.PersonId == personId
                    select new ViewerInfo()
                    {
                        person = new PersonInfo() { Id = a.VisitorId, Name = b.LoginName },
                        LastVisit = a.TVisit
                    };

           return q;
        }

请问，我该如何定义该函数的返回值类型