LINQ包含查询

Question

I'm new at LINQ, and i'm normally will resolve this with SQL, but now i'm trying to do the same with linq and i can't figure this out. I got 3 tables:

• Orders (OrderID, Number, etc)
• OrdersDetail (OrderID, ProductID, Quantity, etc)
• Products (ProductID, Code, Description)

Now i need a list of orders wich contain products matchin a specific code or descripcion string. My SQL will be:

SELECT * FROM Orders WHERE OrderID IN(SELECT OrderID FROM OrdersDetail WHERE ProductID IN(SELECT ProductID FROM Products WHERE Code LIKE 'FilterText%' OR Descripcion LIKE 'FilterText%'))

How do i do this with LINQ? Also is this the best way to do this, specially if Products table are big? Thank you!

Answer 1

db.Orders.Where(o=>o.OrderDetails
                        .Any(od=>od.Product.Code.StartsWith("filterText") 
                           || od.Product.Description.StartsWith("filterText")))
          .ToList()

Answer 2

try this:

var q = (from o in Orders
        from d in o.OrderDetails
        from p in d.Product
        where p.Code.StartsWith("your filter") || p.Description.StartsWith("your filter")
        select o);