asp.net-mvc - LINQ where 子句不返回结果

Question

结果集返回空，并且当我使用 Where 子句（LINQ）时出现错误“枚举未产生结果”。可能是什么问题？

public class Stores
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int StoreId { get; set; }
    public string StoreName { get; set; }
    public string Address { get; set; }
    public string Telephone { get; set; }
    public int TownId { get; set; }
}

public DbSet<Stores> Store { get; set; }

var storeList = from n in db.Store
                where n.TownId == 10
                select n;