Lambda表達式Where子句

Question

Linq轉換爲SQL查詢獲取值其中子句context.purposes.tolist（id = 4000轉換爲4050）它是怎麼回事？

public ActionResult Index() 
{ 
     PurposeModel model = new PurposeModel(); 

     using (DAL.db_Hajj_UmrahEntities context = new DAL.db_Hajj_UmrahEntities()) 
     { 
      List<DAL.Purpose> purposelist = context.Purposes.ToList(); 
      model.PurposeList = purposelist.Select(x => new SelectListItem() 
       { 
        Text =x.PurPose1, 
        Value=x.Id.ToString() 
       }); 
     } 

     return View(model); 
} 

Answer 1

我認爲這是你在找什麼

 context.Purposes.where(s=>s.id>=4000 && s.id<=4050).ToList(); 

Answer 2

model.PurposeList = purposelist.Where(y => y.ID >= 4000 && y.ID <= 4050) 
           .Select(x => new SelectListItem() 
           { 
           Text =x.PurPose1, 
           Value=x.Id.ToString() 
           }) 
           .ToList();