System.Xml.XmlWellFormedWriter.WriteDocType C# (CSharp) Méthode

        public override void WriteDocType(string name, string pubid, string sysid, string subset)
        {
            try
            {
                if (name == null || name.Length == 0)
                {
                    throw new ArgumentException(SR.Xml_EmptyName);
                }
                XmlConvert.VerifyQName(name, ExceptionType.XmlException);

                if (_conformanceLevel == ConformanceLevel.Fragment)
                {
                    throw new InvalidOperationException(SR.Xml_DtdNotAllowedInFragment);
                }

                AdvanceState(Token.Dtd);
                if (_dtdWritten)
                {
                    _currentState = State.Error;
                    throw new InvalidOperationException(SR.Xml_DtdAlreadyWritten);
                }

                if (_conformanceLevel == ConformanceLevel.Auto)
                {
                    _conformanceLevel = ConformanceLevel.Document;
                    _stateTable = s_stateTableDocument;
                }

                int i;

                // check characters
                if (_checkCharacters)
                {
                    if (pubid != null)
                    {
                        if ((i = _xmlCharType.IsPublicId(pubid)) >= 0)
                        {
                            throw new ArgumentException(SR.Format(SR.Xml_InvalidCharacter, XmlException.BuildCharExceptionArgs(pubid, i)), nameof(pubid));
                        }
                    }
                    if (sysid != null)
                    {
                        if ((i = _xmlCharType.IsOnlyCharData(sysid)) >= 0)
                        {
                            throw new ArgumentException(SR.Format(SR.Xml_InvalidCharacter, XmlException.BuildCharExceptionArgs(sysid, i)), nameof(sysid));
                        }
                    }
                    if (subset != null)
                    {
                        if ((i = _xmlCharType.IsOnlyCharData(subset)) >= 0)
                        {
                            throw new ArgumentException(SR.Format(SR.Xml_InvalidCharacter, XmlException.BuildCharExceptionArgs(subset, i)), nameof(subset));
                        }
                    }
                }

                // write doctype
                _writer.WriteDocType(name, pubid, sysid, subset);
                _dtdWritten = true;
            }
            catch
            {
                _currentState = State.Error;
                throw;
            }
        }