如何用linq编写group sql

Question

我有一个如下的SQL：

select catalog,queryname,count(*) from table group by catalog,queryname

现在我如何在linq中编写并获取计数？

感谢

Answer 1

var g =
    from record in table
    group record by new
    {
        record.catalog, record.queryname
    } into mygroup
    select new 
    {
        catalog = key.catalog,
        queryname = key.queryname
        count = myGroup.Count()
    };