使用最小和最大函數在此LINQ查詢與連接？

我正在做一個多表連接的LINQ查詢。在結果集中，我想添加一個顯示最小和最大日期的列，並結合[例如（20/3/2012 - 25/4/2012）]。使用最小和最大函數在此LINQ查詢與連接？

表的結構（這是管理多對多關係的表），從那裏我要挑日期如下：

BookedAreaID int 
AreaID int 
LeasedDate datetime 
InvoiceID int

這裏是我的LINQ查詢：

var selectedResults= 
from InvoiceSet in Invoices 
join BookedAreaSet in BookedAreas on InvoiceSet.InvoiceID equals BookedAreaSet.InvoiceID 
join AreaSet in Areas on BookedAreaSet.AreaID equals AreaSet.AreaID 
join ContactSet in Contacts on InvoiceSet.ContactID equals ContactSet.ContactID 
join Contacts_ObjectsSet in Contacts_Objects on ContactSet.ContactID equals Contacts_ObjectsSet.ContactID 
join CompanySet in Companies on Contacts_ObjectsSet.ObjectReferenceID equals CompanySet.CompanyID 
join BookedAreasSet in BookedAreas on InvoiceSet.InvoiceID equals BookedAreasSet.InvoiceID 

where Contacts_ObjectsSet.ObjectReference=="Company" 

select new {InvoiceSet.InvoiceNumber,InvoiceSet.Amount,InvoiceSet.TotalDiscount,InvoiceSet.GST, 
InvoiceSet.PaymentDate,InvoiceSet.ShoppingCentreID,BookedAreasSet.BookedAreaID,AreaSet.Name,Paid=(InvoiceSet.PaymentDate==null ? "UnPaid":"Paid"), 
licensee=(CompanySet.CompanyName)) 
};

我要選擇像這個查詢的內容：

DateRange= 
(Min(BookedAreasSet.LeasedDate where BookedAreasSet.InvoiceID=InvoiceSet.InvoiceID) 
+ "-" + 
Max(BookedAreasSet.LeasedDate where BookedAreasSet.InvoiceID=InvoiceSet.InvoiceID)

來源

2012-07-11 user576510

你可以這樣做： http://stackoverflow.com/questions/2098375/subquery-in-linq-thats-in-the-select-statement-not-the-where-clause – speti43 2012-07-11 12:56:26

好像你在這個賴斯參加兩次和灰BTW：

「在BookedAreas加入BookedAreasSet上InvoiceSet.InvoiceID等於BookedAreasSet.InvoiceID」

你就不能使用？

DateRange= 
(Min(BookedAreasSet.LeasedDate) 
+ "-" + 
Max(BookedAreasSet.LeasedDate))

來源

2012-07-11 13:03:26

使用最小和最大函數在此LINQ查詢與連接？

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