Question

如何将以下内容转换为LINQ - EF

select Name
from TableA as TableAOuter
group by TableAOuter.Name, TableAOuter.Id
having(
    select count(TableAInner.Id)
    from TableA as TableAInner
    where TAbleAInner.Reference=TableAOuter.Id) = 0
);

Answer 1

对我来说，这看起来像是：

var query = from row in tableOuter
            group row by new { row.Name, row.Id } into g
            where !tableInner.Any(inner => inner.Reference == g.Key.Id)
            select g.Key.Name;

虽然我很想在分组之前执行过滤 - 此时你可以只对行名称进行分组：

var query = from row in tableOuter
            where !tableInner.Any(row => inner.Reference == row.Id)
            group row.Name by new { row.Name, row.Id };

我认为应该做同样的事情，对吗？

LINQ具有内部选择的子句

1 个答案: