string to boolean transforms for specflow step names

StepArgumentTransforms.cs

    [Binding]
    public class StepArgumentTransforms
    {
        static readonly List<string> _positives = "is,can,will,should,does,do,have,correct".Split(',').ToList();
        static readonly List<string> _negatives = "{0}n't,{0}not,{0} not,{0} no,in{0},un{0}".Split(',').SelectMany(s => _positives.Select(word => string.Format(s, word))).ToList();

        [StepArgumentTransformation]
        public bool EnglishBool(string s)
        {
            if (_positives.Contains(s))
            {
                return true;
            }
            if (_negatives.Contains(s))
            {
                return false;
            }

            throw new InvalidOperationException("Couldn't create a bool from "+s);
        } 
    }