sql 2 linq

SQL code

select COUNT(*) as '总数','已占用'=(select COUNT(distinct(graveno)) from d_necro where d_necro.garea='2001') from Graves where FgrId ='2001'

C# code

var query=from g in db.Graves          where g.FgrId== 2001          select new           {            总数=db.Graves.Count(m=>m.FgrId== 2001),            已占用=db.d_necro.Where(n=>n.garea==2001).Select(n=>n.graveno).Distinct().Count()          };