Phone-Word/PhoneTranslator.cs at master · govindAndroid/Phone-Word · GitHub

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/*
 *
 * @author sgtcadet
 */
using System.Text;
using System;
using System.Linq;//added because of error presented at line 21

namespace Core
{

    public static class PhoneTranslator
    {
        public static string ToNumber(string raw)
        {
            if (string.IsNullOrWhiteSpace(raw))

                return "";
            else
                raw = raw.ToUpperInvariant();

            var newNumber = new StringBuilder();
            foreach ( var c in raw)
            {
                if (" -1234567890".Contains(c))
                {
                    newNumber.Append(c);
                }
                else
                {
                    var result = TranslateToNumber(c);
                    if (result != null)
                        newNumber.Append(result);
                }
            }
            return newNumber.ToString();
        }

        static int? TranslateToNumber(char c)
        {
            if ("ABC".Contains(c))
                return 2;
            else if ("DEF".Contains(c))
                return 3;
            else if ("GHI".Contains(c))
                return 4;
            else if ("JKL".Contains(c))
                return 5;
            else if ("MNO".Contains(c))
                return 6;
            else if ("PQRS".Contains(c))
                return 7;
            else if ("TUV".Contains(c))
                return 8;
            else if ("wxyz".Contains(c))
                return 9;
            return null;
        }

        static bool Contains(this string keyString, char c)
        {
            return keyString.IndexOf(c) >= 0;
        }


    }


}