If you create a Service Reference to a WCF service that has operations that return generic collections you might be surprised to find the collection is exposed on the client as an array. This is the default behaviour for a WCF Service Reference but it is configurable.
To change the collection type for operations:
- In Visual Studio 2010 right-click on the appropriate service reference.
- Choose Configure Service Reference… from the pop-up menu.
- Choose an appropriate Collection Type on the dialog box (see image below).
- Click OK.
