Vogen + Result Types

[Foxtrek64]

I'm working on converting a custom type of mine that represents a United States Social Security Number to use Vogen.

One of the features I would like to preserve with this type is being able to return a Result<SocialSecurityNumber>, wherein the Result type contains a the value or an error. The intent and purpose behidn the Result type is to avoid throwing exceptions.

At the moment, I have this:

public static Result<SocialSecurityNumber> TryParseResult(string ssn)
{
    Validation validationResult = Validate(NormalizeInput(ssn));

    return validationResult == Validation.Ok
        ? From(ssn) // double validation
        : new ValidationError(validationResult.Message);

This code has not been tested, but should allow me to effectively replicate what From(string) does in this situation while avoiding throwing. I would simply new up an instance of my type here but doing so is done in error, so I'm stuck with double validating the string.

Is there a better way of handling this situation?

[SteveDunn]

Hi @Foxtrek64 - thanks for the question. Yes, there is a better way that avoids exceptions. You can use the TryParse methods.
One returns a ValueObjectOrError and one return a bool and takes an out parameter.
I've just documented these here. Please feel free to edit that page if anything could be improved (there's an 'Edit page' link at the top).
I've also added some unit tests here that demonstrate its use.

I hope that answers your question.

[Foxtrek64]

Thanks for the quick response! This is exactly what I'm looking for.