SQL à Linq dans WPF en utilisant Visual Studio 2010
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11-11-2019 - |
Question
Hy,
Je veux convertir une commande SQL en linq, mais je reçois le message:
< Nullable object must have a value >
Ma requête SQL est:
Select sum(PosList.Cantity) AS cant, sum(PosList.Value) as mysum,PosList.price,PosList.Name
from list Inner join PosList On list.ID = PosList.FactID
WHERE (list.FirID = 1) AND (PosList.Date BETWEEN '2011-02-22' AND '2012-02-22')
GROUP BY PosList.Name, PosList.Price ORDER BY Value DESC
Mon linq est:
var w = (from item in list join itemPos in PosList on item.ID equals itemPos.FactID
where item.FirID == this.firId && item.Date >= date_start && item.Date <= date_stop
group itemPos by itemPos.Name into hh
let mysum = hh.Sum(s => s.Value)
let cant = hh.Sum(n => n.Cantity)
let price = hh.Average(i => i.Price)
orderby mysum descending
select new Agent("", 0, 0, "", hh.Key, "", 0, (double)price, (double)cant, (double)mysum, 0, "", "", "", "", ""));
J'ai essayé le linq suivant, mais cela n'a pas fonctionné:
var w = (from item in list
join itemPos in PosList on item.ID equals itemPos.FactID
where item.FirID == this.firId && item.Date >= date_start && item.Date <= date_stop
group itemPos by itemPos.Name into hh
let mysum = hh.Sum(s => s.Value)
orderby mysum descending
select new Agent("", 0, 0, "", hh.Key, "", 0, (double)hh.Average(i =>i.Price), (double)hh.Sum(n =>n.Cantity), (double)mysum, 0, "", "", "", "", ""));
Le seul linq qui fonctionne OK est:
var w = (from item in list
join itemPos in PosList
on item.ID equals itemPos.FactID
where item.FirID == this.firId && item.Date >= date_start && item.Date <= date_stop
group itemPos by itemPos.Name into hh
let mysum = hh.Sum(s => s.Value)
orderby mysum descending
select new Agent("", 0, 0, "", hh.Key, "", 0, 0, 0, (double)mysum, 0, "", "", "", "",""));
Mais j'ai aussi besoin de ces deux valeurs (prix et canty).
Merci !
Pas de solution correcte
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