[英]Converting SQL to Linq in c#
我試圖將一些SQL代碼轉換為c#Linq:
SELECT Username, Count(Ticket.TicketId) as 'Tickets Completed'
FROM Ticket
INNER JOIN TicketStatus ON Ticket.TicketStatusID = TicketStatus.TicketStatusID
INNER JOIN Membership ON Ticket.CompletedBy = Membership.UserId
WHERE Ticket.ClosedDate >= @StartDate
and Ticket.ClosedDate <= @EndDate
GROUP BY Username
ORDER BY 'Tickets Completed' DESC
顯示
Paul 6
Mike 4
Donna 3
Elliot 2
我嘗試使用Linqer,這使事情變得更加復雜,並且沒有返回任何結果:
var query = from Ticket in data.Tickets
join Membership in data.Memberships on new { CompletedBy = Guid.Parse(Ticket.CompletedBy.ToString()) } equals new { CompletedBy = Membership.UserId }
where
Ticket.ClosedDate >= StartDate &&
Ticket.ClosedDate <= EndDate
group new { Membership, Ticket } by new
{
Membership.Username
} into g
orderby
"Tickets Completed" descending
select new
{
Username = g.Key.Username,
Completed = g.Count(p => p.Ticket.TicketID > 0)
};
您的幫助將不勝感激。
謝謝
假設CompletedBy
和UserId
列在數據庫中都是uniqueidentifier
,則不需要進行任何類型轉換。
var query = from t in db.ticket
join ts in db.ticketStatus
on t.TicketStatus.ID equals ts.TicketStatusID
join m in db.Membership
on t.CompletedBy equals m.UserId
where t.ClosedDate >= startDate
&& t.closedDate <= endDate
group t by m.UserName into tGroup
order by tGroup.Count(t=> t.TicketId) decending
select new {
UserName = tGroup.Key,
TicketCount = tGroup.Count()
};
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