Add method on Opertaion Contract

Question

Hello I have created a windows service and I am having an issue calling a method to an external class. Here is my setup [ ServiceContract ] [ ServiceKnownType ( typeof ( Customer ))] public interface ICustomerService { [ OperationContract ] void PersistCustomer ( Customer customer ); } The Customer has get and set properties which have no difficulty setting but the there is an Add method on customer that throws an NotSupportedException; Collection was of fixed size each time I try to use it. The collection of customers is setup as an IList and excepts types ICustomer as I have defined. When I try using the Add method outside of my service I have no issues at all which leads me to think I do not have something setup right on my ICustomerService. Can anyone help me with this issue please?

A D · Answer

Ok. I think I have found my issue. I can not use IList because once the service gets a hold of the collection it tries to interpret what IList is and fails horribly and I end with a System.Array instead what I sent across to the service. So the solution to my issue is to use List; concrete class instead of IList. I believe and hope this issue is resolved in a later version of .NET.