隐式SQL查询到Linq [EF]

Question

如何将SQL查询转换为linq并在视图中显示 像这样; i want like this on my view 我的查询是

 SELECT distinct 
subject , COUNT(*) as counts
  FROM [sae].[dbo].[Sae_tblBookDetail]
  where subject is not null
  GROUP BY subject

，此查询的结果为perfect。 ScreenShoot

我的模特班是这个。

 public partial class tblBookDetail
    {
        [Key]
        public int BookID { get; set; }
        public string Title { get; set; }
        public string Subject { get; set; }
}

希望你明白我的意思。