Linq to Entities简单组查询

Question

如何编写（简单）LINQ to Entities查询按一些属性对元素进行分组并计算它们？

SELECT answernumber, count(answerID) FROM answers
WHERE questionID = id
GROUB BY answernumber
ORDERBY answernumber;

这应该很简单，但我不知道如何写它。

Answer 1

var query = answers
   .GroupBy(a => a.answernumber, a => a, (k, g) => new {answernumber = k, Count = g.Count()})
   .OrderyBy(i => i.answernumber);

或者另一种方式：

var query2 = from a in answers
         group a by a. answernumber into g
         orderby g.Key
         select new { answernumber = g.Key, Count = g.Count() };