Linq 中使用Contains()方法时，遇到的一个问题，做个标记

[Dependency]
public IKu<Suifang> Suifangku { get; set; }
...
[CatchException()]
public ActionResult Index(..., long suifangJibieId = -1)
        {
            using (new UnitOfWorkScope())
            {
                ...
                IQueryable<Suifang> query = Suifangku ;
                List<SelectListItem> suifangjibies = new List<SelectListItem>();
                suifangjibies.Add(new SelectListItem
                {
                    Text = "不限随访级别",
                    Value = "-1",
                    Selected = (-1 == suifangJibieId),
                });
                ...
                //正确代码
                   query = query.Where(m => suifangjibies.Where(x => x.Value != "-1").Select(x => long.Parse(x.Value)).ToList().Contains(m.JibieId));//m.JibieId数据类型为long
                //错误代码
                  //query = query.Where(m => suifangjibies.Where(x => x.Value != "-1").Select(x => x.Value).ToList().Contains(m.JibieId.ToString()));//m.JibieId数据类型为long

                ...

　　数据库依赖注入查询时，若属性类型是long类型，当你转化为string类型进行Contains（m.JibieId.ToString()）条件筛选时，将会报错。见代码段示例。