How to return specific list result from linq to entities -

hi experts currenly write code:

public ilist<tresult> getcustomquery<tresult>(int orderid, func<order, tresult> selector)      {         using(repositorydatacontext = new northwindentities())         {             ilist<tresult> res = (from od in repositorydatacontext.order_details                                   join o in repositorydatacontext.orders                                       on od.orderid equals o.orderid                                   join p in repositorydatacontext.products                                       on od.productid equals p.productid                                   join c in repositorydatacontext.customers                                       on o.customerid equals c.customerid                                   o.orderid > orderid                                   select new                                   {                                       o.orderid,                                       od.unitprice,                                       od.quantity,                                       p.productname,                                       c.companyname                                   }).select<order, tresult>(selector).tolist();         }     } 

i want return result of linq entities in specific format(tresult). writing code using lambda expression hard because of joins. line has exception :select < order, tresult > (selector) how can fix that? thanks

instead of creating anonymous type, create poco or in case order

select new order() {  orderproperty1 = o.orderid,  orderproperty2 = od.unitprice,  orderproperty3 = od.quantity,  orderproperty4 = p.productname,  orderproperty5 = c.companyname }).select<order, tresult>(selector).tolist();