也说Linq 分组

看一个例子：from p in Products group p by p.Family  into g select g

那么：

from p in Products group p by p.Family  into g select g.First()
(from p in Products group p by p.Family into g select g).First()

什么结果呢？

from p in Products group p by p.Family  into g select g.First()：

 
(from p in Products group p by p.Family into g select g).First()：