有和条件计数（）在LINQ查询

Question

我想创建此查询：

select Something, count(Something) as "Num_Of_Times" 
from tbl_results 
group by Something 
having count(Something)>5 

我开始用这样的：

tempResults.GroupBy(dataRow => dataRow.Field<string>("Something")) 
    .Count() //(.......what comes here , to make Count()>5?) 

Answer 1

from item in tbl_results 
group item by item.Something into groupedItems 
let count = groupedItems.Count() 
where count > 5 
select new { Something = groupedItems.Key, Num_Of_Times = count }; 

---

UPDATE：这会给你结果为IQueryable<DataRow>：

DataTable dt= new DataTable(); 
dt.Columns.Add("Something", typeof(int)); 
dt.Columns.Add("Num_Of_Times", typeof(int)); 

var results = (from item in tbl_results 
       group item by item.Something into groupedItems 
       let count = groupedItems.Count() 
       where count > 2 
       select dt.Rows.Add(groupedItems.Key, count)).AsQueryable(); 

（请注意，它也填补了DT表）