[英]linq with max date in sub query
我需要選擇一個連接到具有status和插入DateTime的另一個表的記錄。 我希望與AgreementStatuses對應的記錄具有最大Date_Created
from c in Agreements
join a in AgreementStatuses on c.Agreements_ID equals a.Agreements_ID
join s in Statuses on a.Statuses_ID equals s.Statuses_ID
where DateTime.Now > c.BeginDate
&& DateTime.Now < c.TermDate
&& c.ControlPlan_ID == 31
&& s.StatusText == "Promoted"
&& c.AlphaPrefix == "PEH"
&& c.States_ID == 33
&& a.Date_Created == (from n in AgreementStatuses //ERROR HERE
join y in Statuses on n.Statuses_ID equals y.Statuses_ID
where y.StatusText == "Promoted"
&& n.Agreements_ID == 584
group n by n.Agreements_ID into g
select new {Date_Created = g.Max(t=>t.Date_Created)}).FirstOrDefault()
select c
錯誤:
Operator '==' cannot be applied to operands of type 'DateTime' and '<anonymous type: DateTime Date_Created>'
謝謝jdweng。 這樣做了。
from c in Agreements
join a in AgreementStatuses on c.Agreements_ID equals a.Agreements_ID
join s in Statuses on a.Statuses_ID equals s.Statuses_ID
where DateTime.Now > c.BeginDate
&& DateTime.Now < c.TermDate
&& c.ControlPlan_ID == 31
&& s.StatusText == "Promoted"
&& c.AlphaPrefix == "PEH"
//&& c.States_ID == 33
&& a.Date_Created == (from n in AgreementStatuses
join y in Statuses on n.Statuses_ID equals y.Statuses_ID
where y.StatusText == "Promoted"
&& n.Agreements_ID == a.Agreements_ID
group n by n.Agreements_ID into g
select g.Max(t=>t.Date_Created)).FirstOrDefault()
select c
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