Microsoft.Language.Xml.Scanner.UTF16ToUnicode C# (CSharp) Method

        public int UTF16ToUnicode(Scanner.XmlCharResult ch)
        {
            switch (ch.Length)
            {
                case 1:
                    return Convert.ToInt32(ch.Char1);
                case 2:
                    Debug.Assert(
                        Convert.ToInt32(ch.Char1) >= 0xD800 &&
                        Convert.ToInt32(ch.Char1) <= 0xDBFF &&
                        Convert.ToInt32(ch.Char2) >= 0xDC00 &&
                        Convert.ToInt32(ch.Char2) <= 0xDFFF);
                    return (
                        Convert.ToInt32(ch.Char1) - 0xD800) << 10 +
                        (Convert.ToInt32(ch.Char2) - 0xDC00) + 0x10000;
            }

            return 0;
        }