Create and add dynamic List in WebApi 2.0

Question

currently I'm using DTO's and writing my Get Method, which looks like this:

public async Task<IHttpActionResult> GetOrder() {
            var order = from x in db.Order
                        select new OrderDTO {
                            OrderId = x.OrderId,
                            orderStatusCode = x.orderStatusCode,
                            OrderProducts = new List<OrderProductDTO> {
                                new OrderProductDTO {
                                   OrderId = x.OrderProducts.Select(y => y.OrderId)
                                }
                            },
                            purchaseDate = x.purchaseDate,
                            quantityOrder = x.quantityOrder,
                            totalOrderPrice = x.totalOrderPrice,
                            User = new UserDTO {
                                UserId = x.UserId,
                                username = x.User.username,
                                userInfo = new UserInfoDTO {
                                    adress = x.User.UserInfo.adress,
                                    city = x.User.UserInfo.city,
                                    country= x.User.UserInfo.country,
                                    zip  = x.User.UserInfo.zip
                                }
                            }

                        };
            return Ok(order);
        }

The problem I have is how can I initialize my list dynamically, the error i get is:

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'int'.

I get why the problem occurs but dunno how to fix it, thanks. By the way OrdeProducts is a List.

hyankov · Accepted Answer · 2017-03-06 16:01:35Z

1

Problem is here:

new OrderProductDTO {
   OrderId = x.OrderProducts.Select(y => y.OrderId)
}

.Select is returning IEnumerable<int>. You are trying to assign it to an int.

Instead of enumeration, get just one int:

new OrderProductDTO {
   OrderId = x.OrderProducts.Select(y => y.OrderId).FirstOrDefault()
}

answered Mar 6, 2017 at 16:01

hyankov

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