System.Xml.ValidateNames.ParseQName C# (CSharp) Méthode

        internal static int ParseQName(string s, int offset, out int colonOffset)
        {
            int len, lenLocal;

            // Assume no colon
            colonOffset = 0;

            // Parse NCName (may be prefix, may be local name)
            len = ParseNCName(s, offset);
            if (len != 0)
            {
                // Non-empty NCName, so look for colon if there are any characters left
                offset += len;
                if (offset < s.Length && s[offset] == ':')
                {
                    // First NCName was prefix, so look for local name part
                    lenLocal = ParseNCName(s, offset + 1);
                    if (lenLocal != 0)
                    {
                        // Local name part found, so increase total QName length (add 1 for colon)
                        colonOffset = offset;
                        len += lenLocal + 1;
                    }
                }
            }

            return len;
        }

        private void ValidateQName(string name)
        {
            if (name.Length == 0)
            {
                throw new ArgumentException(SR.Xml_EmptyName);
            }
            int colonPos;
            int len = ValidateNames.ParseQName(name, 0, out colonPos);

            if (len != name.Length)
            {
                string res = (len == 0 || (colonPos > -1 && len == colonPos + 1)) ? SR.Xml_BadStartNameChar : SR.Xml_BadNameChar;
                throw new ArgumentException(string.Format(res, XmlException.BuildCharExceptionArgs(name, len)));
            }
        }