选择通过LINQ最后一个记录失败，

Question

我有以下查询在数据库中调用包含通过“直接事件，这些线路的方法时，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 
} 

以下错误选择的最后一个记录“不能识别方法” “关于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. 

表结构如下：

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

Answer 1

拉斯维加斯t不支持Linq to Entities。执行OrderByDescending（通常通过ID或某个日期列）并先选择。喜欢的东西：

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(); 

参考请参阅MSDN文章Supported and Unsupported LINQ Methods (LINQ to Entities)。