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I have created an WCF application that will be consumed by a Delphi 7 class. AFAIK, C# string type is UTF16 and Delphi’s 7 string type is Ansi.
The question is: because of C# and Delphi string types are different, should I declare all my functions with bytes[] instead of string? Am I gonna have issues by using strings on my methods?
I think youll need to decalre everything WideString in Delphi.
You say you made the .NET WCF services and there to be consumed by Delphi 7 clients, but are the clients also under your control? your question seems to imply that is the case. I answer assuming that to be true.
Even if your [OperationContract]s in .NET side have byte[] type parameters all of the default contract wire serialisers (SOAP, JASON, etc…) will use the .NET XML formatting and this is (AFAK) all UTF-16.
So whilst you could put your parameters into explicit byte arrays the message payloads would all be UTF-16 XML.