Convert Iqueryable to a type

Question

I made that code

OrderItem itens = new OrderItem();
            var items = _orderService.GetItemsFromOrder(orderId);
            itens = items.Where(x => x.CurrencyCode == 23).Select(s => new OrderItem { ProductId = s.ProductId, CurrencyCode = s.CurrencyCode.GetValueOrDefault() }).ToList();

and you’re making that mistake:

Cannot implicitly Convert type System.Collections.Generic.List 'CSP.SubscriptionCenter.Core.domain.Orders.Orderitem' to 'CSP.SubscriptionCenter.Core.domain.Orders.Orderitem'

But the lambda I typed her as OrderItem, then it was like this:

items >> Iqueryable

Items >> Orderitem

In the case of Currencycode in Orderitem is a nullable, so I did it in the expression

CurrencyCode = s.CurrencyCode.GetValueOrDefault()

How do I resolve this above mentioned error?

OBS: In the error message I removed the <> symbols, because it was giving problems at quotar time and I put quote(').

Answer 1

As Mauro said in the comment, there is a statement error of itens. Note that the return on Tolist is a list of OrderItem and not an element.

You can correct in two ways:

List<OrderItem> itens = new List<OrderItem>();
var items = _orderService.GetItemsFromOrder(orderId);
itens = items.Where(x => x.CurrencyCode == 23).Select(s => new OrderItem { ProductId = s.ProductId, CurrencyCode = s.CurrencyCode.GetValueOrDefault() }).ToList();

Or return only one element per FirstOrDefault:

OrderItem itens = new OrderItem();
var items = _orderService.GetItemsFromOrder(orderId);
itens = items.Where(x => x.CurrencyCode == 23).Select(s => new OrderItem { ProductId = s.ProductId, CurrencyCode = s.CurrencyCode.GetValueOrDefault() }).FirstOrDefault();

I would still recommend not to declare the type and use a var for the return you want:

var itens = items.Where(x => x.CurrencyCode == 23).Select(s => new OrderItem { ProductId = s.ProductId, CurrencyCode = s.CurrencyCode.GetValueOrDefault() }).ToList();

I hope I’ve helped.