Why would a WCF method's return type be changed from a generic collection to an array?

Question

I have a WCF service method which I have written for return type as collection type.

But if I generate a proxy class and consume the method from the client the methods r

Answer 1

If you generate the proxy using "Add Service Reference" in Visual Studio there is an "Advanced" button that brings up a dialog that allows you to specify what the return type should be (including Generic types).