相关疑难解决方法(0)

假设我有这个SQL:

SELECT p.ParentId, COUNT(c.ChildId)
FROM ParentTable p
  LEFT OUTER JOIN ChildTable c ON p.ParentId = c.ChildParentId
GROUP BY p.ParentId

如何将其转换为LINQ to SQL？我被困在COUNT(c.ChildId),生成的SQL似乎总是输出COUNT(*).这是我到目前为止所得到的:

from p in context.ParentTable
join c in context.ChildTable on p.ParentId equals c.ChildParentId into j1
from j2 in j1.DefaultIfEmpty()
group j2 by p.ParentId into grouped
select new { ParentId = grouped.Key, Count = grouped.Count() }

谢谢!