スペースとか改行コードとかの空文字を除去
    public static class StringsConvert
    {
        /// <summary>
        /// 空文字除去
        /// </summary>
        /// <param name="chars"></param>
        /// <returns></returns>
        public static string RemoveSpace(this string chars)
        {
            var newChars = new char[chars.Length];
            int length = 0;
            foreach (var c in chars)
            {
                if (spaceList.IndexOf(c) < 0)
                {
                    newChars[length] = c;
                    length++;
                }
            }
            return new string(newChars, 0, length);
        }
        private static List<char> spaceList = new List<char>
        {
            (char)0x200B,
            (char)0x200C,
            (char)0x200D,
            (char)0xFEFF,
            (char)0x2028,
            (char)0x2029,
            (char)0x0009,
            (char)0x000A,
            (char)0x000B,
            (char)0x000C,
            (char)0x000D,
            (char)0x0085,
            (char)0x0020,
            (char)0x00A0,
            (char)0x1680,
            (char)0x180E,
            (char)0x2000,
            (char)0x2001,
            (char)0x2002,
            (char)0x2003,
            (char)0x2004,
            (char)0x2005,
            (char)0x2006,
            (char)0x2007,
            (char)0x2008,
            (char)0x2009,
            (char)0x200A,
            (char)0x202F,
            (char)0x205F,
            (char)0x3000,            
        };
    }