Can't use optional parameters when implementing an interface for a WCF

Question

In my interface I have declared this.

[OperationContract]
[WebGet]
String GetStuff(String beep, String boop = \"too lazy to type\");

I impl

Answer 1

Simply: default arguments are not supported.

By design and with reason. We use C# to write WCF contracts but that's a notational trick. Not every C# language feature can be implemented in SOAP, REST or JSon.