我怎麼能寫的LINQ

Question

組SQL我有一個SQL象下面這樣：

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

現在，我怎麼把它寫在LINQ和獲取計數？

感謝

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() 
    };