如何在SQL查詢轉換爲LINQ與ORDERBY，GROUPBY

Question

我寫在LINQ寫這個SQL查詢，但沒有工作..

select [ProcessTime], Count([ID]) as 'amount of processes' 
from [DB].[dbo].[TableX] 
where [ID] in ('ServerX', 'ServerY') and [Type] ='Complete' 
group by [ProcessTime] 
order by [ProcessTime] 

我想實現這個LINQ &什麼我都試過了，我將查詢分爲兩個，一個用於處理時間group by子句和另一計數ID的

var query1 = (from a in this.db.Processes 
       where (a.ID =='ServerX' || a.ID =='ServerY') && a.Type =='Complete' 
       group a by a.ProcessTime into b 
       //here I dont know where to place orderby 
       select b); 


var query2 = (from a in this.db.Processes 
       where (a.ID =='ServerX' || a.ID =='ServerY') && a.Type =='Complete' 
       orderby a.ProcessTime 
       select a).Count(); 

這是對查詢分成兩個正確的方式再後來將它們結合起來？

Answer 1

試試這個：

var serverNames = new string[]{"ServerX", "ServerY"}; 
var result = db.Processes 
    .Where(p => serverNames.Contains(p.ID) && p.Type == "Complete") 
    .GroupBy(p => p.ProcessTime) 
    .Select(g => new 
    { 
     ProcessTime = g.Key, 
     AmountOfProcesses = g.Count() 
    }) 
    .OrderBy(x => x.ProcessTime); 

Answer 2

你可以做到這一切在一個查詢：

var query1 = (from a in this.db.Processes 
       where (a.ID == "ServerX" || a.ID == "ServerY") && a.Type == "Complete" 
       group a by a.ProcessTime into b 
       orderby b.Key 
       select new {ProcessTime = b.Key, Count = b.Count()});