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

        private int ParseQName(bool isQName, int startOffset, out int colonPos)
        {
            int colonOffset = -1;
            int pos = _ps.charPos + startOffset;

        ContinueStartName:
            char[] chars = _ps.chars;

            // start name char
            unsafe
            {
                if (_xmlCharType.IsStartNCNameSingleChar(chars[pos]))
                {
                    pos++;
                }
#if XML10_FIFTH_EDITION
                else if (pos + 1 < ps.charsUsed && xmlCharType.IsNCNameSurrogateChar(chars[pos + 1], chars[pos]))
                {
                    pos += 2;
                }
#endif
                else
                {
                    if (pos + 1 >= _ps.charsUsed)
                    {
                        if (ReadDataInName(ref pos))
                        {
                            goto ContinueStartName;
                        }
                        Throw(pos, SR.Xml_UnexpectedEOF, "Name");
                    }
                    if (chars[pos] != ':' || _supportNamespaces)
                    {
                        Throw(pos, SR.Xml_BadStartNameChar, XmlException.BuildCharExceptionArgs(chars, _ps.charsUsed, pos));
                    }
                }
            }

        ContinueName:
            // parse name
            unsafe
            {
                for (;;)
                {
                    if (_xmlCharType.IsNCNameSingleChar(chars[pos]))
                    {
                        pos++;
                    }
#if XML10_FIFTH_EDITION
                    else if ( pos + 1 < ps.charsUsed && xmlCharType.IsNCNameSurrogateChar( chars[pos + 1], chars[pos] ) ) {
                        pos += 2;
                    }
#endif
                    else
                    {
                        break;
                    }
                }
            }

            // colon
            if (chars[pos] == ':')
            {
                if (_supportNamespaces)
                {
                    if (colonOffset != -1 || !isQName)
                    {
                        Throw(pos, SR.Xml_BadNameChar, XmlException.BuildCharExceptionArgs(':', '\0'));
                    }
                    colonOffset = pos - _ps.charPos;
                    pos++;
                    goto ContinueStartName;
                }
                else
                {
                    colonOffset = pos - _ps.charPos;
                    pos++;
                    goto ContinueName;
                }
            }
            // end of buffer
            else if (pos == _ps.charsUsed
#if XML10_FIFTH_EDITION
                || ( pos + 1 == ps.charsUsed && xmlCharType.IsNCNameHighSurrogateChar( chars[pos] ) ) 
#endif
                )
            {
                if (ReadDataInName(ref pos))
                {
                    chars = _ps.chars;
                    goto ContinueName;
                }
                Throw(pos, SR.Xml_UnexpectedEOF, "Name");
            }

            // end of name
            colonPos = (colonOffset == -1) ? -1 : _ps.charPos + colonOffset;
            return pos;
        }