System.Xml.Serialization.XmlSchemaImporter.ImportEnumeratedDataType C# (CSharp) Method

        private TypeMapping ImportEnumeratedDataType(XmlSchemaSimpleType dataType, string typeNs, string identifier, TypeFlags flags, bool isList)
        {
            TypeMapping mapping = (TypeMapping)ImportedMappings[dataType];
            if (mapping != null)
                return mapping;

            XmlSchemaType sourceType = dataType;
            while (!sourceType.DerivedFrom.IsEmpty)
            {
                sourceType = FindType(sourceType.DerivedFrom, TypeFlags.CanBeElementValue | TypeFlags.CanBeAttributeValue);
            }
            if (sourceType is XmlSchemaComplexType) return null;
            TypeDesc sourceTypeDesc = Scope.GetTypeDesc((XmlSchemaSimpleType)sourceType);
            if (sourceTypeDesc != null && sourceTypeDesc.FullName != typeof(string).FullName)
                return ImportPrimitiveDataType(dataType, flags);
            identifier = Accessor.UnescapeName(identifier);
            string typeName = GenerateUniqueTypeName(identifier);
            EnumMapping enumMapping = new EnumMapping();
            enumMapping.IsReference = Schemas.IsReference(dataType);
            enumMapping.TypeDesc = new TypeDesc(typeName, typeName, TypeKind.Enum, null, 0);
            if (dataType.Name != null && dataType.Name.Length > 0)
                enumMapping.TypeName = identifier;
            enumMapping.Namespace = typeNs;
            enumMapping.IsFlags = isList;

            CodeIdentifiers constants = new CodeIdentifiers();
            XmlSchemaSimpleTypeContent content = dataType.Content;

            if (content is XmlSchemaSimpleTypeRestriction)
            {
                XmlSchemaSimpleTypeRestriction restriction = (XmlSchemaSimpleTypeRestriction)content;
                for (int i = 0; i < restriction.Facets.Count; i++)
                {
                    object facet = restriction.Facets[i];
                    if (!(facet is XmlSchemaEnumerationFacet)) continue;
                    XmlSchemaEnumerationFacet enumeration = (XmlSchemaEnumerationFacet)facet;
                    // validate the enumeration value
                    if (sourceTypeDesc != null && sourceTypeDesc.HasCustomFormatter)
                    {
                        XmlCustomFormatter.ToDefaultValue(enumeration.Value, sourceTypeDesc.FormatterName);
                    }
                    ConstantMapping constant = new ConstantMapping();
                    string constantName = CodeIdentifier.MakeValid(enumeration.Value);
                    constant.Name = constants.AddUnique(constantName, constant);
                    constant.XmlName = enumeration.Value;
                    constant.Value = i;
                }
            }
            enumMapping.Constants = (ConstantMapping[])constants.ToArray(typeof(ConstantMapping));
            if (isList && enumMapping.Constants.Length > 63)
            {
                // if we have 64+ flag constants we cannot map the type to long enum, we will use string mapping instead.
                mapping = GetDefaultMapping(TypeFlags.CanBeElementValue | TypeFlags.CanBeTextValue | TypeFlags.CanBeAttributeValue);
                ImportedMappings.Add(dataType, mapping);
                return mapping;
            }
            ImportedMappings.Add(dataType, enumMapping);
            Scope.AddTypeMapping(enumMapping);
            return enumMapping;
        }