Question

快速概述后，如果我有几个嵌套的内连接，我没有找到如何处理linq到sql。

这就是我想要的linq

SELECT Booking.BookingId, Booking.EventId, Booking.StartDate, Event.Name, Person.FirstName
FROM Booking
    INNER JOIN Event 
        INNER JOIN Asset
        ON Asset.AssetId = Event.AssetId
        INNER JOIN Person
        ON Person.PersonId = Event.ContactPersonId
    ON Event.EventId = Booking.EventId AND Event.State = 4

有谁知道如何将其翻译成LINQ？谢谢。

Answer 1

var q1= from a in booking,b in event,c in asset, d in person where a.eventid=b.eventid and b.state=4 and c.assetid = b.assetid and b.contactpersonid=d.personid select a,b,c,d

你可以用你想要的列名替换a，b，c，d

另一种方法是使用join关键字：

var w1= from a in booking join b in event on a.eventid equals b.eventid join c in asset on ...

Answer 2

var query = from b in context.Bookings
    from e in context.Events
    join a in context.Assets on e.AssetId equals a.AssetId
    join p in context.People on e.ContactPersonId equals p.PersonId
    where e.State == (byte)States.Approved && e.EventId == b.EventId
    select new { EventName = e.Name, BookingDate = b.StartDate };

linq到sql的嵌套内连接？

2 个答案: