Question

I have some service that I can query:

http://localhost/myservice/data?key=value

Is there a way I can restrict the query parameters? E.g. I want to report an error if someone calls the service with unsupported parameter, e.g. I want following to fail:

http://localhost/myservice/data?key=value&anyotherparam=1

I am not sure if this is the right thing to do. However I was asked if the above scenario can be implemented so I want to give a reasonable answer.

Answer 1

If your service ignores the anotherparam, honestly who cares?

And for those who care:

public ActionResult Data(string key)
{
    if (string.IsNullOrEmpty(key) || Request.QueryString.Count > 1)
    {
        return HttpNotFound();
    }

    ...
}

And obviously if you have to write this if over and over again across multiple actions you are better of refactoring it into a custom action filter.