Prohibited values

[raymondb1]

Hi there,

Can I specify that certain parameter values are invalid? Something to the same effect of:

        private string _server = null;
        [Option('s', "server", Required = true, HelpText = "Some text here")]
        public virtual string Server
        {
            get { return _server; }
            set {   if (string.Compare("localhost", value, true) == 0)
                    {
                        _server = null;
                        throw new ArgumentException("Localhost is not accepted as a server name.");
                    }

                }
        }

Of course, I can validate after parsing is complete, but I had to do it in many places. Is there a better way?

Thanks!

[nemec]

The code you posted should do what you're asking. IMO validation should be separate from parsing, aside from basic things like passing text to an int. There are lots of great libraries for that like Fluent Validation, plus a lot of more complex validation (obj.Age must be >18 if obj.CanVote == true) can't be done until after parsing.

[gsscoder]

I think @nemec was talking about this lib: https://github.com/JeremySkinner/FluentValidation. Right?

@raymondb1, I'm agree with @nemec, anyway I don't think a few validation machinery will never be added to this library too.

In issue #158 we discuss some of this eventual mechanism. Please give a look and back here (or there) to say what you think.

Thank you for choosing this project for you command line parsing needs! 👍