System.Xml.DTDReader.ReadAttributeDefaultValue C# (CSharp) Méthode

		private void ReadAttributeDefaultValue (DTDAttributeDefinition def)
		{
			if(PeekChar () == '#')
			{
				ReadChar ();
				switch(PeekChar ())
				{
				case 'R':
					Expect ("REQUIRED");
					def.OccurenceType = DTDAttributeOccurenceType.Required;
					break;
				case 'I':
					Expect ("IMPLIED");
					def.OccurenceType = DTDAttributeOccurenceType.Optional;
					break;
				case 'F':
					Expect ("FIXED");
					def.OccurenceType = DTDAttributeOccurenceType.Fixed;
					if (!SkipWhitespace ())
						throw NotWFError ("Whitespace is required between FIXED and actual value in DTD attribute definition.");
					def.UnresolvedDefaultValue = ReadDefaultAttribute ();
					break;
				}
			} else {
				// one of the enumerated value
				SkipWhitespace ();
				TryExpandPERef ();
				def.UnresolvedDefaultValue = ReadDefaultAttribute ();
			}

			// VC: If default value exists, it should be valid.
			if (def.DefaultValue != null) {
				string normalized = def.Datatype.Normalize (def.DefaultValue);
				bool breakup = false;
				object parsed = null;

				// enumeration validity
				if (def.EnumeratedAttributeDeclaration.Count > 0) {
					if (!def.EnumeratedAttributeDeclaration.Contains (normalized)) {
						HandleError (new XmlSchemaException ("Default value is not one of the enumerated values.",
							def.LineNumber, def.LinePosition, null, def.BaseURI, null));
						breakup = true;
					}
				}
				if (def.EnumeratedNotations.Count > 0) {
					if (!def.EnumeratedNotations.Contains (normalized)) {
						HandleError (new XmlSchemaException ("Default value is not one of the enumerated notation values.",
							def.LineNumber, def.LinePosition, null, def.BaseURI, null));
						breakup = true;
					}
				}

				// type based validity
				if (!breakup) {
					try {
						parsed = def.Datatype.ParseValue (normalized, DTD.NameTable, null);
					} catch (Exception ex) { // FIXME: (wishlist) bad catch ;-(
						HandleError (new XmlSchemaException ("Invalid default value for ENTITY type.",
							def.LineNumber, def.LinePosition, null, def.BaseURI, ex));
						breakup = true;
					}
				}
				if (!breakup) {
					switch (def.Datatype.TokenizedType) {
					case XmlTokenizedType.ENTITY:
						if (DTD.EntityDecls [normalized] == null)
							HandleError (new XmlSchemaException ("Specified entity declaration used by default attribute value was not found.",
								def.LineNumber, def.LinePosition, null, def.BaseURI, null));
						break;
					case XmlTokenizedType.ENTITIES:
						string [] entities = parsed as string [];
						for (int i = 0; i < entities.Length; i++) {
							string entity = entities [i];
							if (DTD.EntityDecls [entity] == null)
								HandleError (new XmlSchemaException ("Specified entity declaration used by default attribute value was not found.",
									def.LineNumber, def.LinePosition, null, def.BaseURI, null));
						}
						break;
					}
				}
			}
			// Extra ID attribute validity check.
			if (def.Datatype != null && def.Datatype.TokenizedType == XmlTokenizedType.ID)
				if (def.UnresolvedDefaultValue != null)
					HandleError (new XmlSchemaException ("ID attribute must not have fixed value constraint.",
						def.LineNumber, def.LinePosition, null, def.BaseURI, null));

		}