如何通過數據的一行從控制器查看，不爲IEnumerable <>

Question

我想從控制器發送數據，以查看像

EMP e =(EMP) db.EMPs.Where(n => n.id == j); 
return View(e); 

這裏EMP是Model對象。 的誤差是

無法轉換類型的對象System.Data.Entity.Infrastructure.DbQuery`1 [WebApplication1.Models.EMP]鍵入WebApplication1.Models.EMP

注：我不能使用IEnumerable<Model>

Answer 1

有一些方法可以做到這一點：

// this way would throw exception if no result was found or more than 1 result 
EMP e =(EMP) db.EMPs.Single(n => n.id == j); 

// if no result was found, return null 
EMP e =(EMP) db.EMPs.SingleOrDefault(n => n.id == j); 

// if no result was found, throw exception. 
// if there are more than 1 result, return the first item 
EMP e =(EMP) db.EMPs.First(n => n.id == j); 

// if no result was found, return null. 
// if there are more than 1 result, return the first item 
EMP e =(EMP) db.EMPs.FirstOrDefault(n => n.id == j); 

// cast to list 
List<EMP> e =(EMP) db.EMPs.Where(n => n.id == j).ToList(); 
// then, select the first item via index: 
return View(e[0]); 

Answer 2

只是FirstOrDefault更換Where到返回序列的第一個元素：

EMP e = (EMP) db.EMPs.FirstOrDefault(n => n.id == j);