Question

I have a WCF service and web client. Web service implements one method SubmitOrders.
This method takes a collection of orders. The problem is that service must return an array
of results for each order – true or false. Marking WCF paramters as out or ref makes no
sense. What would you recommend?

[ServiceContact]
public bool SubmitOrders(OrdersInfo)

[DataContract]
public class OrdersInfo
{
  Order[] Orders;
}

Answer 1

Marking WCF paramters as out or ref makes no sense.

out parameters do make sense in WCF.

What would you recommend?

I recommend to use out parameters.

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Note 1: It will move your out parameter to be the first parameter on you.

Note 2: Yes you can return objects with complex types in WCF. Tag your class with an attribute of [DataContract] and your properties with an attribute of [DataMember].