asp.net core 3.0 新手问题：如何这段带“count” 和 group by的sql代码，怎么转成asp.net core 可用的 linq的代码。

原始sql：

select EOI_Reach, count(EOI_Reach) from survey where EOI_Category='Valid' group by EOI_Reach

求linq写法，asp.net core 3.0 (mvc)可用

var query = (from x in survey
group x by x.EOI_Reach into g
select new { EOI_Reach = g.Key, cnt = g.Count() }).
Where(x => x.EOI_Category == "Valid");