How do you do Multiple Inner Joins in Linq to Entities

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萌比男神i
萌比男神i 2020-12-09 22:45

I have already searched through SO and could not fins a workable solution for this. I am just trying to figure what is the syntax for multiple inner joins in Linq to Entitie

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  •  醉酒成梦
    2020-12-09 23:32

    Jon's answer will work, but IMHO using join in LINQ to Entities is usually wrong, because it duplicates code in your model. I can rewrite Jon's query in a much simpler way in L2E:

    var query = from customer in db.Customers
                from order in customer.Orders
                from product in order.Products
                from info in product.Info
                select new
                {
                    customer.Name, 
                    info.BriefDescription
                }
    

    That's about 50% of the typing and 0% of the duplicated code. Consider that your relationships have already been defined in your DB and in your model. Do you really want to duplicate them again in every query you write, and break your queries when you refactor your model?

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