選擇通過LINQ最後一個記錄失敗，

Question

我有以下查詢在數據庫中調用包含通過「直接事件，這些線路的方法時，返回

using (Entities ent = new Entities()) 
{ 
Loaction last = (from x in ent.Locations select x).Last(); 
Location add = new Location(); 
add.id = last.id+1; 
//some more stuff 
} 

以下錯誤選擇的最後一個記錄「不能識別方法」 「關於ext.net：

LINQ to Entities does not recognize the method 'Prototype.DataAccess.Location Last[Location] 
(System.Linq.IQueryable`1[Prototype.DataAccess.Location])' method, 
and this method cannot be translated into a store expression. 

表結構如下：

int ident IDENTITY NOT NULL, 
int id NOT NULL, 
varchar(50) name NULL, 
//some other varchar fields 

Answer 1

拉斯維加斯t不支持Linq to Entities。執行OrderByDescending（通常通過ID或某個日期列）並先選擇。喜歡的東西：

Location last = (from l in ent.Locations 
       orderby l.ID descending 
       select l).First(); 

或者

Location last = ent.Locations.OrderByDescending(l => l.ID).First(); 

參考請參閱MSDN文章Supported and Unsupported LINQ Methods (LINQ to Entities)。