WCF Metadata contains a reference that cannot be resolved

Question

I\'ve spent a couple of hours searching about this error, and I have tested almost everything it\'s on Google.

I want to access a service using TCP, .NET4 an

Answer 1

Maybe it will be helpful for someone.

My issue was in a contract argument, and I discovered it with help of Event Viewer:

The operation [Name of method] either has a parameter or a return type that is attributed with MessageContractAttribute. In order to represent the request message using a Message Contract, the operation must have a single parameter attributed with MessageContractAttribute. In order to represent the response message using a Message Contract, the operation's return value must be a type that is attributed with MessageContractAttribute and the operation may not have any out or ref parameters.

So, if you appended more than one arguments, already having [MessageContract] argument, then you'll see error in question. Completely not obvious.