Only parameterless constructors and initializers are supported in LINQ to Entities

Question

I have this error in this linq expression :

var naleznosci = (from nalTmp in db.Naleznosci
                              where nalTmp.idDziecko == idDziec
           


        

Answer 1

If you're like me and don't want to have to populate your properties for each query you're building, there is another way to solve this issue.

var query = from orderDetail in context.OrderDetails
            join order in context.Orders on order.OrderId equals orderDetail.orderId
            select new { order, orderDetail };

At this point you have an IQueryable containing an anonymous object. If you want to populate your custom object with a constructor you can simply do something like this:

return query.ToList().Select(r => new OrderDetails(r.order, r.orderDetail));

Now your custom object (which takes two objects as a parameter) can populate your properties as needed.