How to use int.TryParse with nullable int? [duplicate]

Answer 1

Could not prevent myself to produce a generic version. Usage below.

    public class NullableHelper
    {
        public delegate bool TryDelegate(string s, out T result);

        public static bool TryParseNullable(string s, out T? result, TryDelegate tryDelegate) where T : struct
        {
            if (s == null)
            {
                result = null;
                return true;
            }

            T temp;
            bool success = tryDelegate(s, out temp);
            result = temp;
            return success;
        }

        public static T? ParseNullable(string s, TryDelegate tryDelegate) where T : struct
        {
            if (s == null)
            {
                return null;
            }

            T temp;
            return tryDelegate(s, out temp)
                       ? (T?)temp
                       : null;
        } 
    }


bool? answer = NullableHelper.ParseNullable(answerAsString, Boolean.TryParse);