PreRegistrationHandler not failing on Task error code

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I am trying to implement validation on a custom data attribute through the PreRegistrationHandler. This works great when it passes validation.

However, when it does not, it creates the account anyway. When validation does not pass, I return a Task result code of one which should make it fail.

PreRegistrationHandler = (context, cancellationToken) =>
        {
            var passesvalidation = DoesPassValidation(context); // evals to false
            if (!passesvalidation)
            {
                return Task.FromResult(1); //should fail and not create account, but does anyway
            }
            return Task.FromResult(0); // passes
        }

Is there an undocumented return code that I should be using? I've checked here: https://docs.stormpath.com/dotnet/aspnet/latest/registration.html#pre-registration-handler

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Nate Barbettini On BEST ANSWER

This functionality works as of version 0.9.0 of the Stormpath ASP.NET plugin.

The syntax for failing validation inside of the PreRegistrationHandler is:

PreRegistrationHandler = (context, cancellationToken) =>
{
    var passesvalidation = DoesPassValidation(context); // evals to false
    if (!passesvalidation)
    {
        context.Result = new PreRegistrationResult()
        {
            Success = false,
            ErrorMessage = "No way, José!" // optional validation message
        };

        return Task.FromResult(1); // returned value doesn't matter
    }

    return Task.FromResult(0); // without setting context.Result, success is assumed
}