Question

I am using WCF REST Service (4.0) to expose JSON API ..but not getting my WebFaultException to work.

I have following in my method:

        if (!int.TryParse(Id, out idValue))
        {
            throw new WebFaultException<string>(string.Format(WebExceptionMessages.NotIntegerAsParameter),
                                                HttpStatusCode.BadRequest);
        }

and when i try to call the service from fiddler i always receive the same error message:

I have been trying to search for a solution for some time now…please help.

Answer 1

The WebFaultException is working properly – the error message in Visual Studio is just telling you that it wasn’t handled – that’s the expected behavior. Visual Studio debugger will tell you it’s unhandled since you didn’t trap the error via try/catch. See related MSDN blog regarding WebFaultException usage.