Namespaces
- Autodesk.Revit.ApplicationServices Namespace
- Autodesk.Revit.Attributes Namespace
- Autodesk.Revit.Creation Namespace
- Autodesk.Revit.DB Namespace
  - ACADExportOptions Class
  - ACADVersion Enumeration
  - ACAObjectPreference Enumeration
  - AdaptiveComponentFamilyUtils Class
  - AdaptiveComponentInstanceUtils Class
  - AdaptivePointConstraintType Enumeration
  - AdaptivePointOrientationType Enumeration
  - AdaptivePointType Enumeration
  - AddInId Class
  - AllowedValues Enumeration
  - AlphanumericRevisionSettings Class
  - AlternateUnits Enumeration
  - AnalyzesAsType Enumeration
  - AnnotationSymbol Class
  - AnnotationSymbolType Class
  - APIObject Class
  - AppearanceAssetElement Class
  - Arc Class
  - Area Class
  - AreaElemType Enumeration
  - AreaFilter Class
  - AreaScheme Class
  - AreaTag Class
  - AreaTagFilter Class
  - AreaTagType Class
  - AreaVolumeSettings Class
  - ArrayAnchorMember Enumeration
  - AssemblyCodeTable Class
  - AssemblyDetailViewOrientation Enumeration
  - AssemblyDifference Class
  - AssemblyDifferenceConfiguration Class
  - AssemblyDifferenceMemberCount Class
  - AssemblyDifferenceMemberDifference Class
  - AssemblyDifferenceNamingCategory Class
  - AssemblyDifferenceNone Class
  - AssemblyInstance Class
  - AssemblyMemberDifference Class
  - AssemblyMemberDifferentCategory Class
  - AssemblyMemberDifferentGeometry Class
  - AssemblyMemberDifferentParameters Class
  - AssemblyMemberDifferentType Class
  - AssemblyType Class
  - AssemblyViewUtils Class
  - AttachmentType Enumeration
  - AutomaticConnectionBehaviorType Enumeration
  - BackgroundImageFit Enumeration
  - BackgroundSettings Class
  - BackgroundStyle Enumeration
  - BaseArray Class
  - BaseExportOptions Class
  - BaseImportOptions Class
  - BaseLoadOn Enumeration
  - BasePoint Class
  - BasicFileInfo Class
  - BeamSystem Class
  - BeamSystemJustifyType Enumeration
  - BeamSystemType Class
  - BehaviorType Enumeration
  - Binding Class
  - BindingMap Class
  - Blend Class
  - BooleanOperationsType Enumeration
  - BooleanOperationsUtils Class
  - BorderTile Enumeration
  - BoundarySegment Class
  - BoundingBoxContainsPointFilter Class
  - BoundingBoxIntersectsFilter Class
  - BoundingBoxIsInsideFilter Class
  - BoundingBoxUV Class
  - BoundingBoxXYZ Class
  - BoxPlacement Enumeration
  - BrowserOrganization Class
  - BrowserOrganizationType Enumeration
  - BuildingPadType Class
  - BuildingSiteExportOptions Class
  - BuildingType Enumeration
  - BuiltInCategory Enumeration
  - BuiltInFailures Class
  - BuiltInFailures.AnalyticalModelFailures Class
  - BuiltInFailures.ArrayFailures Class
  - BuiltInFailures.AssemblyFailures Class
  - BuiltInFailures.AutoJoinFailures Class
  - BuiltInFailures.AutoRouteFailures Class
  - BuiltInFailures.BeamFailures Class
  - BuiltInFailures.BeamSystemFailures Class
  - BuiltInFailures.BendFailures Class
  - BuiltInFailures.BlendFailures Class
  - BuiltInFailures.ColorFillFailures Class
  - BuiltInFailures.ColumnFailures Class
  - BuiltInFailures.ColumnInsideWallFailures Class
  - BuiltInFailures.ComponentRepeaterFailures Class
  - BuiltInFailures.ComponentRepeaterSlotFailures Class
  - BuiltInFailures.ConnectorFailures Class
  - BuiltInFailures.ConstraintFailures Class
  - BuiltInFailures.ConversionFailures Class
  - BuiltInFailures.CopyMonitorFailures Class
  - BuiltInFailures.CopyPasteFailures Class
  - BuiltInFailures.CreationFailures Class
  - BuiltInFailures.CurtainGridFamilyFailures Class
  - BuiltInFailures.CurtainWallFailures Class
  - BuiltInFailures.CurveByPointFailures Class
  - BuiltInFailures.CurveFailures Class
  - BuiltInFailures.CutFailures Class
  - BuiltInFailures.CutterFailures Class
  - BuiltInFailures.CuttingFailures Class
  - BuiltInFailures.DatumPlaneFailures Class
  - BuiltInFailures.DebugTabBindingFailures Class
  - BuiltInFailures.DecalFailures Class
  - BuiltInFailures.DesignOptionFailures Class
  - BuiltInFailures.DetailFailures Class
  - BuiltInFailures.DimensionFailures Class
  - BuiltInFailures.DisplacementElementFailures Class
  - BuiltInFailures.DividedPathFailures Class
  - BuiltInFailures.DividedSurfaceFailures Class
  - BuiltInFailures.DocumentFailures Class
  - BuiltInFailures.DPartFailures Class
  - BuiltInFailures.DuctFailures Class
  - BuiltInFailures.EditingFailures Class
  - BuiltInFailures.ElectricalFailures Class
  - BuiltInFailures.ElectricityFailures Class
  - BuiltInFailures.ElementFailures Class
  - BuiltInFailures.ElementTypeFailures Class
  - BuiltInFailures.ElevationFailures Class
  - BuiltInFailures.EnergyAnalysisFailures Class
  - BuiltInFailures.EnergyAnalysisUtilitiesDBFailures Class
  - BuiltInFailures.ExportFailures Class
  - BuiltInFailures.ExtrusionFailures Class
  - BuiltInFailures.FabricAreaFailures Class
  - BuiltInFailures.FabricFailures Class
  - BuiltInFailures.FabricSheetFailures Class
  - BuiltInFailures.FaceSplitterFailures Class
  - BuiltInFailures.FamilyFailures Class
  - BuiltInFailures.FilledRegionFailures Class
  - BuiltInFailures.FloorFailures Class
  - BuiltInFailures.FluidFailures Class
  - BuiltInFailures.FormFailures Class
  - BuiltInFailures.GeneralFailures Class
  - BuiltInFailures.GenericFailures Class
  - BuiltInFailures.GenericMEPFailures Class
  - BuiltInFailures.GeometryFailures Class
  - BuiltInFailures.GlobalParameterFailures Class
  - BuiltInFailures.GridChainSketchFailures Class
  - BuiltInFailures.GridFailures Class
  - BuiltInFailures.GroupFailures Class
  - BuiltInFailures.HostObjFailures Class
  - BuiltInFailures.HvacFailures Class
  - BuiltInFailures.IlluminationFailures Class
  - BuiltInFailures.ImageFailures Class
  - BuiltInFailures.ImportExportFailures Class
  - BuiltInFailures.ImportFailures Class
  - BuiltInFailures.InaccurateFailures Class
  - BuiltInFailures.InfillFailures Class
  - BuiltInFailures.InterferenceFailures Class
  - BuiltInFailures.JoinElementsFailures Class
  - BuiltInFailures.KeyBasedTreeEntryFailures Class
  - BuiltInFailures.KeyBasedTreeFileFailures Class
  - BuiltInFailures.KeynoteFailures Class
  - BuiltInFailures.KeynoteTagFailures Class
  - BuiltInFailures.LegendFailures Class
  - BuiltInFailures.LevelFailures Class
  - BuiltInFailures.LinkFailures Class
  - BuiltInFailures.LoadFailures Class
  - BuiltInFailures.LooseDimensionFailures Class
  - BuiltInFailures.MassFailures Class
  - BuiltInFailures.MatchlineFailures Class
  - BuiltInFailures.MechanicalFailures Class
  - BuiltInFailures.MEPCalculationFailures Class
  - BuiltInFailures.MEPFabricationFailures Class
  - BuiltInFailures.MirrorFailures Class
  - BuiltInFailures.MultiReferenceAnnotationFailures Class
  - BuiltInFailures.NumberingFailures Class
  - BuiltInFailures.OffsetFacesCellLegacyFailures Class
  - BuiltInFailures.OpeningFailures Class
  - BuiltInFailures.OverlapFailures Class
  - BuiltInFailures.ParameterFailures Class
  - BuiltInFailures.PartMakerMethodForFamilyInstanceFailures Class
  - BuiltInFailures.PartMakerMethodForMergePartFailures Class
  - BuiltInFailures.PartMakerMethodForWallFailures Class
  - BuiltInFailures.PathFailures Class
  - BuiltInFailures.PerformanceFailures Class
  - BuiltInFailures.PipingFailures Class
  - BuiltInFailures.PlanRegionFailures Class
  - BuiltInFailures.PointFailures Class
  - BuiltInFailures.ProfileFailures Class
  - BuiltInFailures.PropertySetElementFailures Class
  - BuiltInFailures.RebarFailures Class
  - BuiltInFailures.RebarShapeFailures Class
  - BuiltInFailures.RebarSystemFailures Class
  - BuiltInFailures.RefPlaneFailures Class
  - BuiltInFailures.RegenFailures Class
  - BuiltInFailures.RenderFailures Class
  - BuiltInFailures.RevisionCloudFailures Class
  - BuiltInFailures.RevisionFailures Class
  - BuiltInFailures.RevolutionFailures Class
  - BuiltInFailures.RoofFailures Class
  - BuiltInFailures.RoomFailures Class
  - BuiltInFailures.ScheduleViewFailures Class
  - BuiltInFailures.SculptingFailures Class
  - BuiltInFailures.SectionViewFailures Class
  - BuiltInFailures.SelectionFailures Class
  - BuiltInFailures.SheetFailures Class
  - BuiltInFailures.SiteFailures Class
  - BuiltInFailures.SiteImportFailures Class
  - BuiltInFailures.SketchFailures Class
  - BuiltInFailures.SkylightFailures Class
  - BuiltInFailures.SlabFailures Class
  - BuiltInFailures.SlabShapeFailures Class
  - BuiltInFailures.SlantedColumnFailures Class
  - BuiltInFailures.SpanDirectionSymbolFailures Class
  - BuiltInFailures.SplineFailures Class
  - BuiltInFailures.StairRampFailures Class
  - BuiltInFailures.StructuralAssetFailures Class
  - BuiltInFailures.StructuralConnectionFailures Class
  - BuiltInFailures.StructuralLoadFailures Class
  - BuiltInFailures.SweepFailures Class
  - BuiltInFailures.SweptBlendFailures Class
  - BuiltInFailures.SystemNavigatorFailures Class
  - BuiltInFailures.SystemsFailures Class
  - BuiltInFailures.TagFailures Class
  - BuiltInFailures.TextFailures Class
  - BuiltInFailures.TilePatternTileFailures Class
  - BuiltInFailures.ToggleViewFailures Class
  - BuiltInFailures.TrussFailures Class
  - BuiltInFailures.ViewFailures Class
  - BuiltInFailures.WallFailures Class
  - BuiltInFailures.WallJoinFailures Class
  - BuiltInFailures.WallJoinRoofFailures Class
  - BuiltInFailures.WorksharingFailures Class
  - BuiltInParameter Enumeration
  - BuiltInParameterGroup Enumeration
  - CADExportOptions Class
  - CADLinkType Class
  - CameraInfo Class
  - Categories Class
  - Category Class
  - CategoryNameMap Class
  - CategoryNameMapIterator Class
  - CategorySet Class
  - CategorySetIterator Class
  - CategoryType Enumeration
  - Ceiling Class
  - CeilingAndFloor Class
  - CeilingType Class
  - CellType Enumeration
  - ChangePriority Enumeration
  - ChangeType Class
  - CheckoutStatus Enumeration
  - City Class
  - CitySet Class
  - CitySetIterator Class
  - ClassificationEntries Class
  - ClassificationEntry Class
  - Color Class
  - ColorBackgroundSettings Class
  - ColorDepthType Enumeration
  - ColumnAttachment Class
  - ColumnAttachmentCutStyle Enumeration
  - ColumnAttachmentJustification Enumeration
  - CombinableElement Class
  - CombinableElementArray Class
  - CombinableElementArrayIterator Class
  - ComponentRepeater Class
  - ComponentRepeaterIterator Class
  - ComponentRepeaterSlot Class
  - ComponentRotation Enumeration
  - CompoundStructure Class
  - CompoundStructureDeckUsage Enumeration
  - CompoundStructureError Enumeration
  - CompoundStructureLayer Class
  - CompoundStructureLayerFunction Enumeration
  - ConfigurationReloadInfo Class
  - ConicalFace Class
  - ConnectionResolution Enumeration
  - ConnectionValidationInfo Class
  - ConnectionValidationWarning Class
  - ConnectionWarning Enumeration
  - Connector Class
  - ConnectorDomainType Enumeration
  - ConnectorElement Class
  - ConnectorGenderType Enumeration
  - ConnectorJointType Enumeration
  - ConnectorManager Class
  - ConnectorProfileType Enumeration
  - ConnectorSet Class
  - ConnectorSetIterator Class
  - ConnectorType Enumeration
  - Construction Class
  - ContentNode Class
  - Control Class
  - ControlShape Enumeration
  - CoordinatePlaneVisibility Enumeration
  - CopyPasteOptions Class
  - CurtainCell Class
  - CurtainGrid Class
  - CurtainGridAlignType Enumeration
  - CurtainGridLine Class
  - CurtainGridSet Class
  - CurtainGridSetIterator Class
  - CurtainSystem Class
  - CurtainSystemBase Class
  - CurtainSystemType Class
  - Curve Class
  - CurveArrArray Class
  - CurveArrArrayIterator Class
  - CurveArray Class
  - CurveArrayIterator Class
  - CurveByPoints Class
  - CurveByPointsArray Class
  - CurveByPointsArrayIterator Class
  - CurveByPointsUtils Class
  - CurveElement Class
  - CurveElementFilter Class
  - CurveElementType Enumeration
  - CurveExtents Class
  - CurveLoop Class
  - CurveLoopIterator Class
  - CurveLoopsProfile Class
  - CurveNode Class
  - CurveProjectionType Enumeration
  - CustomExporter Class
  - CutFailureReason Enumeration
  - CylindricalFace Class
  - CylindricalHelix Class
  - DataConversionMonitorScope Class
  - DataExchangeMessageId Enumeration
  - DataExchangeMessageSeverity Enumeration
  - DataExchangeMessageVerbosity Enumeration
  - DatumEnds Enumeration
  - DatumExtentType Enumeration
  - DatumPlane Class
  - DaylightPortalNode Class
  - DecimalSymbol Enumeration
  - DefaultDivideSettings Class
  - Definition Class
  - DefinitionBindingMap Class
  - DefinitionBindingMapIterator Class
  - DefinitionFile Class
  - DefinitionGroup Class
  - DefinitionGroups Class
  - Definitions Class
  - DeleteElements Class
  - DesignOption Class
  - DetachFromCentralOption Enumeration
  - DetailArc Class
  - DetailCurve Class
  - DetailCurveArray Class
  - DetailCurveArrayIterator Class
  - DetailElementOrderUtils Class
  - DetailEllipse Class
  - DetailLine Class
  - DetailNurbSpline Class
  - DGNExportOptions Class
  - DGNFileFormat Enumeration
  - DGNImportOptions Class
  - DigitGroupingAmount Enumeration
  - DigitGroupingSymbol Enumeration
  - Dimension Class
  - DimensionSegment Class
  - DimensionSegmentArray Class
  - DimensionSegmentArrayIterator Class
  - DimensionShape Enumeration
  - DimensionStyleType Enumeration
  - DimensionType Class
  - DirectShape Class
  - DirectShapeLibrary Class
  - DirectShapeOptions Class
  - DirectShapeReferencingOption Enumeration
  - DirectShapeRoomBoundingOption Enumeration
  - DirectShapeTargetViewType Enumeration
  - DirectShapeType Class
  - DisplacementElement Class
  - DisplacementPath Class
  - DisplacementPathStyle Enumeration
  - DisplayStyle Enumeration
  - DisplayUnit Enumeration
  - DisplayUnitType Enumeration
  - DistanceMeasuredFrom Enumeration
  - DistributionOfNormals Enumeration
  - DividedPath Class
  - DividedPathMeasurementType Enumeration
  - DividedSurface Class
  - Document Class
  - DocumentPreviewSettings Class
  - DocumentSet Class
  - DocumentSetIterator Class
  - DocumentType Enumeration
  - DocumentValidation Class
  - DocumentVersion Class
  - Domain Enumeration
  - DoubleArray Class
  - DoubleArrayIterator Class
  - DoubleParameterValue Class
  - DuplicateTypeAction Enumeration
  - DuplicateTypeNamesHandlerArgs Class
  - DWFExportOptions Class
  - DWFImageFormat Enumeration
  - DWFImageQuality Enumeration
  - DWFImportOptions Class
  - DWFXExportOptions Class
  - DWGExportOptions Class
  - DWGImportOptions Class
  - DXFExportOptions Class
  - EaveCutterType Enumeration
  - Edge Class
  - EdgeArray Class
  - EdgeArrayArray Class
  - EdgeArrayArrayIterator Class
  - EdgeArrayIterator Class
  - EditScope Class
  - Element Class
  - ElementArray Class
  - ElementArrayIterator Class
  - ElementBinding Class
  - ElementCategoryFilter Class
  - ElementClassFilter Class
  - ElementDesignOptionFilter Class
  - ElementFilter Class
  - ElementId Class
  - ElementIdParameterValue Class
  - ElementIntersectsElementFilter Class
  - ElementIntersectsFilter Class
  - ElementIntersectsSolidFilter Class
  - ElementIsCurveDrivenFilter Class
  - ElementIsElementTypeFilter Class
  - ElementLevelFilter Class
  - ElementLogicalFilter Class
  - ElementMulticategoryFilter Class
  - ElementMulticlassFilter Class
  - ElementOnPhaseStatus Enumeration
  - ElementOwnerViewFilter Class
  - ElementParameterFilter Class
  - ElementPhaseStatusFilter Class
  - ElementQuickFilter Class
  - ElementRecord Class
  - ElementReferenceType Enumeration
  - ElementSet Class
  - ElementSetIterator Class
  - ElementSlowFilter Class
  - ElementStructuralTypeFilter Class
  - ElementTransformUtils Class
  - ElementType Class
  - ElementTypeGroup Enumeration
  - ElementWorksetFilter Class
  - ElevationMarker Class
  - Ellipse Class
    - Ellipse Members
    - Ellipse Methods
      - Create Method
      - Intersect Method
      - IsInside Method
    - Ellipse Properties
  - EndCapCondition Enumeration
  - ExclusionFilter Class
  - ExportColorMode Enumeration
  - ExportColumnHeaders Enumeration
  - ExportDGNSettings Class
  - ExportDWGSettings Class
  - ExportEnergyModelType Enumeration
  - ExportFontInfo Class
  - ExportFontKey Class
  - ExportFontTable Class
  - ExportFontTableIterator Class
  - ExportLayerInfo Class
  - ExportLayerKey Class
  - ExportLayerTable Class
  - ExportLayerTableIterator Class
  - ExportLinetypeInfo Class
  - ExportLinetypeKey Class
  - ExportLinetypeTable Class
  - ExportLinetypeTableIterator Class
  - ExportLineweightInfo Class
  - ExportLineweightKey Class
  - ExportLineweightTable Class
  - ExportLineweightTableIterator Class
  - ExportPaperFormat Enumeration
  - ExportPatternInfo Class
  - ExportPatternKey Class
  - ExportPatternTable Class
  - ExportPatternTableIterator Class
  - ExportRange Enumeration
  - ExportSheetType Enumeration
  - ExportTextQualifier Enumeration
  - ExportUnit Enumeration
  - ExportUtils Class
  - ExternalDBApplicationResult Enumeration
  - ExternalDefinition Class
  - ExternalDefinitionCreationOptions Class
  - ExternalDefinitions Class
  - ExternalFileReference Class
  - ExternalFileReferenceType Enumeration
  - ExternalFileUtils Class
  - ExternalResourceBrowserData Class
  - ExternalResourceLoadContent Class
  - ExternalResourceLoadContext Class
  - ExternalResourceLoadData Class
  - ExternalResourceLoadStatus Enumeration
  - ExternalResourceMatchOptions Class
  - ExternalResourceReference Class
  - ExternalResourceServerExtensions Class
  - ExternalResourceServerUtils Class
  - ExternalResourceServiceUtils Class
  - ExternalResourceType Class
  - ExternalResourceTypes Class
  - ExternalResourceTypes.BuiltInExternalResourceTypes Class
  - ExternalResourceUIBrowseResultType Enumeration
  - ExternalResourceUtils Class
  - Extrusion Class
  - ExtrusionAnalyzer Class
  - ExtrusionAnalyzerFaceAlignment Enumeration
  - ExtrusionRoof Class
  - FabricationConfiguration Class
  - FabricationConfigurationInfo Class
  - FabricationConnectorInfo Class
  - FabricationDimensionDefinition Class
  - FabricationDimensionType Enumeration
  - FabricationDimensionUnitType Enumeration
  - FabricationHostedInfo Class
  - FabricationPart Class
  - FabricationPartType Class
  - FabricationRodInfo Class
  - FabricationService Class
  - FabricationServiceButton Class
  - Face Class
  - FaceArray Class
  - FaceArrayIterator Class
  - FaceIntersectionFaceResult Enumeration
  - FaceNode Class
  - FaceSecondDerivatives Class
  - FaceSplitter Class
  - FacetingUtils Class
  - FaceWall Class
  - FailureDefinition Class
  - FailureDefinitionAccessor Class
  - FailureDefinitionId Class
  - FailureDefinitionRegistry Class
  - FailureHandlingOptions Class
  - FailureMessage Class
  - FailureMessageAccessor Class
  - FailureMessageKey Class
  - FailureProcessingResult Enumeration
  - FailureResolution Class
  - FailureResolutionType Enumeration
  - FailuresAccessor Class
  - FailureSeverity Enumeration
  - Family Class
  - FamilyElementVisibility Class
  - FamilyElementVisibilityType Enumeration
  - FamilyHostingBehavior Enumeration
  - FamilyInstance Class
  - FamilyInstanceFilter Class
  - FamilyManager Class
  - FamilyParameter Class
  - FamilyParameterSet Class
  - FamilyParameterSetIterator Class
  - FamilyPlacementType Enumeration
  - FamilyPointLocation Class
  - FamilyPointPlacementReference Class
  - FamilySizeTable Class
  - FamilySizeTableColumn Class
  - FamilySizeTableErrorInfo Class
  - FamilySizeTableErrorType Enumeration
  - FamilySizeTableManager Class
  - FamilySource Enumeration
  - FamilySymbol Class
  - FamilySymbolFilter Class
  - FamilySymbolProfile Class
  - FamilyThermalProperties Class
  - FamilyType Class
  - FamilyTypeSet Class
  - FamilyTypeSetIterator Class
  - FamilyUtils Class
  - FBXExportOptions Class
  - FilePath Class
  - FilledRegion Class
  - FilledRegionBackground Enumeration
  - FilledRegionType Class
  - FillGrid Class
  - FillPattern Class
  - FillPatternElement Class
  - FillPatternHostOrientation Enumeration
  - FillPatternTarget Enumeration
  - FilterableValueProvider Class
  - FilterCategoryRule Class
  - FilterDoubleRule Class
  - FilteredElementCollector Class
  - FilteredElementIdIterator Class
  - FilteredElementIterator Class
  - FilteredWorksetCollector Class
  - FilteredWorksetIdIterator Class
  - FilteredWorksetIterator Class
  - FilterElement Class
  - FilterElementIdRule Class
  - FilterIntegerRule Class
  - FilterInverseRule Class
  - FilterNumericEquals Class
  - FilterNumericGreater Class
  - FilterNumericGreaterOrEqual Class
  - FilterNumericLess Class
  - FilterNumericLessOrEqual Class
  - FilterNumericRuleEvaluator Class
  - FilterNumericValueRule Class
  - FilterRule Class
  - FilterStringBeginsWith Class
  - FilterStringContains Class
  - FilterStringEndsWith Class
  - FilterStringEquals Class
  - FilterStringGreater Class
  - FilterStringGreaterOrEqual Class
  - FilterStringLess Class
  - FilterStringLessOrEqual Class
  - FilterStringRule Class
  - FilterStringRuleEvaluator Class
  - FilterValueRule Class
  - FindReferenceTarget Enumeration
  - FitDirectionType Enumeration
  - FittingAndAccessoryCalculationType Enumeration
  - FittingAngleUsage Enumeration
  - Floor Class
  - FloorFace Enumeration
  - FloorType Class
  - FlowDirectionType Enumeration
  - FolderItemInfo Class
  - FootPrintRoof Class
  - Form Class
  - FormArray Class
  - FormArrayIterator Class
  - FormatOptions Class
  - FormattedTextRun Class
  - FormatUtils Class
  - FormatValueOptions Class
  - FormUtils Class
  - Frame Class
  - FreeFormElement Class
  - GBXMLExportOptions Class
  - GBXMLImportOptions Class
  - GenericForm Class
  - GenericImportOptions Class
  - GeomCombination Class
  - GeomCombinationSet Class
  - GeomCombinationSetIterator Class
  - GeometryCreationUtilities Class
  - GeometryElement Class
  - GeometryInstance Class
  - GeometryObject Class
  - GlobalParameter Class
  - GlobalParametersManager Class
  - GradientBackgroundSettings Class
  - GraphicsStyle Class
  - GraphicsStyleType Enumeration
  - Grid Class
  - GridNode Structure
  - GridNodeLocation Enumeration
  - GridSegmentDirection Enumeration
  - GridType Class
  - Group Class
  - GroupNode Class
  - GroupSet Class
  - GroupSetIterator Class
  - GroupType Class
  - GuidEnum Class
  - HermiteFace Class
  - HermiteSpline Class
  - HermiteSplineTangents Class
  - HiddenLineViewsType Enumeration
  - HomeCamera Class
  - HorizontalAlign Enumeration
  - HorizontalAlignmentStyle Enumeration
  - HorizontalTextAlignment Enumeration
  - HostedSweep Class
  - HostedSweepType Class
  - HostObjAttributes Class
  - HostObject Class
  - HostObjectUtils Class
  - ICentralLockedCallback Interface
  - IConnector Interface
  - IDataConversionMonitor Interface
  - IDuplicateTypeNamesHandler Interface
  - IExportContext Interface
  - IExtension Interface
  - IExternalDBApplication Interface
  - IExternalResourceServer Interface
  - IFailuresPreprocessor Interface
  - IFailuresProcessor Interface
  - IFamilyLoadOptions Interface
  - IFCExportOptions Class
  - IFCVersion Enumeration
  - IGetLocalPathForOpenCallback Interface
  - ImageBackgroundSettings Class
  - ImageExportOptions Class
  - ImageFileType Enumeration
  - ImageImportOptions Class
  - ImageResolution Enumeration
  - ImageType Class
  - ImageView Class
  - IModelExportContext Interface
  - ImportColorMode Enumeration
  - ImportExportFileFormat Enumeration
  - ImportInstance Class
  - ImportPlacement Enumeration
  - ImportUnit Enumeration
  - INavisworksExporter Interface
  - IndependentTag Class
  - InsertableObject Class
  - InSessionPrintSetting Class
  - InSessionViewSheetSet Class
  - Instance Class
  - InstanceBinding Class
  - InstanceNode Class
  - InstanceVoidCutUtils Class
  - InsulationLiningBase Class
  - IntegerParameterValue Class
  - IntegerRange Class
  - InternalDefinition Class
  - InternalDefinitions Class
  - IntersectionResult Class
  - IntersectionResultArray Class
  - IntersectionResultArrayIterator Class
  - IOnLocalLinkSharedCoordinatesSavedCallback Interface
  - IPerformanceAdviserRule Interface
  - IPhotoRenderContext Interface
  - IPrintSetting Interface
  - ISaveSharedCoordinatesCallback Interface
  - ISaveSharedCoordinatesCallbackForUnloadLocally Interface
  - ITransactionFinalizer Interface
  - IUpdater Interface
  - IViewSheetSet Interface
  - JoinGeometryUtils Class
  - JoinType Enumeration
  - JunctionType Enumeration
  - KeyBasedTreeEntries Class
  - KeyBasedTreeEntriesIterator Class
  - KeyBasedTreeEntriesLoadContent Class
  - KeyBasedTreeEntriesLoadResults Class
  - KeyBasedTreeEntry Class
  - KeyBasedTreeEntryError Class
  - KeyBasedTreeEntryErrorType Enumeration
  - KeyBasedTreeEntryTable Class
  - KeynoteEntries Class
  - KeynoteEntry Class
  - KeynoteTable Class
  - LabelUtils Class
  - LayerCategoryType Enumeration
  - LayerModifier Class
  - LayoutRule Class
  - LayoutRuleClearSpacing Class
  - LayoutRuleFixedDistance Class
  - LayoutRuleFixedNumber Class
  - LayoutRuleMaximumSpacing Class
  - Leader Class
  - LeaderArray Class
  - LeaderArrayIterator Class
  - LeaderAtachement Enumeration
  - LeaderEndCondition Enumeration
  - LeaderShape Enumeration
  - Level Class
  - LevelType Class
  - LightingSource Enumeration
  - LightNode Class
  - Line Class
  - LineAndTextAttrSymbol Class
  - LinearArray Class
  - LinePattern Class
  - LinePatternElement Class
  - LinePatternSegment Class
  - LinePatternSegmentType Enumeration
  - LineProperties Class
  - LineScaling Enumeration
  - LineSegment Class
  - LinkConversionData Class
  - LinkedFileStatus Enumeration
  - LinkElementId Class
  - LinkLoadContent Class
  - LinkNode Class
  - LoadOperationType Enumeration
  - Location Class
  - LocationCurve Class
  - LocationPoint Class
  - LogicalAndFilter Class
  - LogicalOrFilter Class
  - MarginType Enumeration
  - MassDisplayTemporaryOverrideType Enumeration
  - MassInstanceUtils Class
  - Material Class
  - MaterialAspect Enumeration
  - MaterialFunctionAssignment Enumeration
  - MaterialNode Class
  - MaterialPropertyPathType Enumeration
  - MEPCalculationServerInfo Class
  - MEPConnectorInfo Class
  - MEPCurve Class
  - MEPCurveType Class
  - MEPModel Class
  - MEPSize Class
  - MEPSystem Class
  - MEPSystemClassification Enumeration
  - MEPSystemType Class
  - Mesh Class
  - MeshFromGeometryOperationIssue Enumeration
  - MeshFromGeometryOperationResult Class
  - MeshTriangle Class
  - ModelArc Class
  - ModelCurve Class
  - ModelCurveArrArray Class
  - ModelCurveArrArrayIterator Class
  - ModelCurveArray Class
  - ModelCurveArrayIterator Class
  - ModelCurveNode Class
  - ModelEllipse Class
  - ModelHermiteSpline Class
  - ModelLine Class
  - ModelNurbSpline Class
  - ModelPath Class
  - ModelPathUtils Class
  - ModelText Class
  - ModelTextType Class
  - ModelUpdatesStatus Enumeration
  - ModifierType Enumeration
  - Mullion Class
  - MullionType Class
  - MullionTypeSet Class
  - MullionTypeSetIterator Class
  - MultiReferenceAnnotation Class
  - MultiReferenceAnnotationOptions Class
  - MultiReferenceAnnotationType Class
  - MultiSegmentGrid Class
  - NamingUtils Class
  - NavisworksCoordinates Enumeration
  - NavisworksExportOptions Class
  - NavisworksExportScope Enumeration
  - NavisworksParameters Enumeration
  - NestedFamilyTypeReference Class
  - NullParameterValue Class
  - NumberingSchema Class
  - NumberingSchemaType Class
  - NumberingSchemaTypes Class
  - NumberingSchemaTypes.StructuralNumberingSchemas Class
  - NumberSystem Class
  - NumberSystemDisplayRule Enumeration
  - NumberSystemJustifyOption Enumeration
  - NumericRevisionSettings Class
  - NurbSpline Class
  - ObjectFactory Class
  - Opening Class
  - OpeningWrappingCondition Enumeration
  - OpenOptions Class
  - OptionalFunctionalityUtils Class
  - Options Class
  - Outline Class
  - OverrideGraphicSettings Class
  - OverridePermissions Enumeration
  - PageOrientationType Enumeration
  - Panel Class
  - PanelType Class
  - PanelTypeSet Class
  - PanelTypeSetIterator Class
  - PaperPlacementType Enumeration
  - PaperSize Class
  - PaperSizeSet Class
  - PaperSizeSetIterator Class
  - PaperSource Class
  - PaperSourceSet Class
  - PaperSourceSetIterator Class
  - Parameter Class
  - ParameterElement Class
  - ParameterFilterElement Class
  - ParameterFilterRuleFactory Class
  - ParameterFilterUtilities Class
  - ParameterMap Class
  - ParameterMapIterator Class
  - ParameterSet Class
  - ParameterSetIterator Class
  - ParametersOrder Enumeration
  - ParameterType Enumeration
  - ParameterValue Class
  - ParameterValueProvider Class
  - Part Class
  - PartEdgeConditionOrientation Enumeration
  - PartMaker Class
  - PartMakerMethodToDivideVolumes Class
  - PartsVisibility Enumeration
  - PartType Enumeration
  - PartUtils Class
  - Path3d Class
  - PathType Enumeration
  - PerformanceAdviser Class
  - PerformanceAdviserRuleId Class
  - PerformanceAdviserRules Class
  - Phase Class
  - PhaseArray Class
  - PhaseArrayIterator Class
  - PhaseFilter Class
  - PhaseStatusPresentation Enumeration
  - PlanarFace Class
  - PlanCircuit Class
  - PlanCircuitSet Class
  - PlanCircuitSetIterator Class
  - Plane Class
  - PlanTopology Class
  - PlanTopologySet Class
  - PlanTopologySetIterator Class
  - PlanViewDirection Enumeration
  - PlanViewPlane Enumeration
  - PlanViewRange Class
  - PlanViewRangeError Enumeration
  - PlanViewRangeLevel Enumeration
  - Point Class
  - PointCloudColorMode Enumeration
  - PointCloudFoundStatus Enumeration
  - PointCloudInstance Class
  - PointCloudType Class
  - PointElementReference Class
  - PointLocationOnCurve Class
  - PointNode Class
  - PointOnCurveMeasureFrom Enumeration
  - PointOnCurveMeasurementType Enumeration
  - PointOnEdge Class
  - PointOnEdgeEdgeIntersection Class
  - PointOnEdgeFaceIntersection Class
  - PointOnFace Class
  - PointOnPlane Class
  - PointRelativeToPoint Class
  - PolyLine Class
  - PolylineNode Class
  - PolylineSegments Class
  - PolymeshFacet Class
  - PolymeshTopology Class
  - PreferredJunctionType Enumeration
  - PreviewFamilyVisibilityMode Enumeration
  - PrimaryDesignOptionMemberFilter Class
  - PrimarySizeCriterion Class
  - PrinterResolution Enumeration
  - PrintManager Class
  - PrintParameters Class
  - PrintRange Enumeration
  - PrintSetting Class
  - PrintSetup Class
  - Profile Class
  - ProfileFamilyUsage Enumeration
  - ProfilePlaneLocation Enumeration
  - ProjectInfo Class
  - ProjectLocation Class
  - ProjectLocationSet Class
  - ProjectLocationSetIterator Class
  - ProjectPosition Class
  - PropertyLine Class
  - PropertySetElement Class
  - PropertySetLibrary Class
  - PropOverrideMode Enumeration
  - RadialArray Class
  - RasterQualityType Enumeration
  - RectangularGridSegmentOrientation Enumeration
  - Reference Class
  - ReferenceableViewUtils Class
  - ReferenceArray Class
  - ReferenceArrayArray Class
  - ReferenceArrayArrayIterator Class
  - ReferenceArrayIterator Class
  - ReferenceIntersector Class
  - ReferencePlane Class
  - ReferencePoint Class
  - ReferencePointArray Class
  - ReferencePointArrayIterator Class
  - ReferenceType Enumeration
  - ReferenceWithContext Class
  - RelinquishedItems Class
  - RelinquishOptions Class
  - ReloadLatestOptions Class
  - RenderEngine Enumeration
  - RenderingImageExposureSettings Class
  - RenderingQuality Enumeration
  - RenderingQualitySettings Class
  - RenderingSettings Class
  - RenderNode Class
  - RenderNodeAction Enumeration
  - RepeaterBounds Class
  - RepeaterCoordinates Class
  - RepeatingReferenceSource Class
  - ResolutionTarget Enumeration
  - ResourceVersionStatus Enumeration
  - Revision Class
  - RevisionCloud Class
  - RevisionNumbering Enumeration
  - RevisionNumberType Enumeration
  - RevisionSettings Class
  - RevisionVisibility Enumeration
  - RevitLinkInstance Class
  - RevitLinkLoadResult Class
  - RevitLinkLoadResultType Enumeration
  - RevitLinkOperations Class
  - RevitLinkOptions Class
  - RevitLinkType Class
  - Revolution Class
  - RevolvedFace Class
  - RoofBase Class
  - RoofType Class
  - RoundingMethod Enumeration
  - RoutingCondition Class
  - RoutingConditions Class
  - RoutingCriterionBase Class
  - RoutingPreferenceErrorLevel Enumeration
  - RoutingPreferenceManager Class
  - RoutingPreferenceRule Class
  - RoutingPreferenceRuleGroupType Enumeration
  - RPCNode Class
  - RuledFace Class
  - SATExportOptions Class
  - SATImportOptions Class
  - SaveAsOptions Class
  - SaveModifiedLinksOptions Enumeration
  - SaveModifiedLinksOptionsForUnloadLocally Enumeration
  - SaveOptions Class
  - SchedulableField Class
  - ScheduleDefinition Class
  - ScheduleField Class
  - ScheduleFieldId Class
  - ScheduleFieldType Enumeration
  - ScheduleFilter Class
  - ScheduleFilterType Enumeration
  - ScheduleHeadingOrientation Enumeration
  - ScheduleHorizontalAlignment Enumeration
  - ScheduleSheetInstance Class
  - ScheduleSortGroupField Class
  - ScheduleSortOrder Enumeration
  - SectionType Enumeration
  - Segment Class
  - SelectionFilterAction Enumeration
  - SelectionFilterElement Class
  - ServerPath Class
  - ServiceType Enumeration
  - SetComparisonResult Enumeration
  - Settings Class
  - ShapeBuilder Class
  - SharedParameterApplicableRule Class
  - SharedParameterElement Class
  - ShellLayerType Enumeration
  - ShowHiddenLinesValues Enumeration
  - SimpleWorksetConfiguration Enumeration
  - SiteLocation Class
  - Sketch Class
  - SketchBase Class
  - SketchPlane Class
  - SKPImportOptions Class
  - SkyBackgroundSettings Class
  - SlabEdge Class
  - SlabEdgeType Class
  - SlabShapeCrease Class
  - SlabShapeCreaseArray Class
  - SlabShapeCreaseArrayIterator Class
  - SlabShapeCreaseType Enumeration
  - SlabShapeEditor Class
  - SlabShapeVertex Class
  - SlabShapeVertexArray Class
  - SlabShapeVertexArrayIterator Class
  - SlabShapeVertexType Enumeration
  - SlantedOrVerticalColumnType Enumeration
  - Solid Class
  - SolidCurveIntersection Class
  - SolidCurveIntersectionMode Enumeration
  - SolidCurveIntersectionOptions Class
  - SolidGeometry Enumeration
  - SolidOptions Class
  - SolidOrShellTessellationControls Class
  - SolidSolidCutUtils Class
  - SolidUtils Class
  - SortingOrder Enumeration
  - SpacingRule Class
  - SpacingRuleJustification Enumeration
  - SpacingRuleLayout Enumeration
  - SpatialElement Class
  - SpatialElementBoundaryLocation Enumeration
  - SpatialElementBoundaryOptions Class
  - SpatialElementBoundarySubface Class
  - SpatialElementCalculationLocation Class
  - SpatialElementCalculationPoint Class
  - SpatialElementFromToCalculationPoints Class
  - SpatialElementGeometryCalculator Class
  - SpatialElementGeometryResults Class
  - SpatialElementTag Class
  - SpatialElementType Enumeration
  - SpecialType Enumeration
  - SpotDimension Class
  - SpotDimensionType Class
  - StairsEditScope Class
  - StartingViewSettings Class
  - StickSymbolLocation Enumeration
  - StorageType Enumeration
  - StringParameterValue Class
  - StructDeckEmbeddingType Enumeration
  - StructuralAsset Class
  - StructuralAssetClass Enumeration
  - StructuralBehavior Enumeration
  - StructuralReleaseType Enumeration
  - SubfaceType Enumeration
  - SubTransaction Class
  - SunAndShadowSettings Class
  - SunAndShadowType Enumeration
  - SunStudyTimeInterval Enumeration
  - Surface Class
  - Sweep Class
  - SweepProfile Class
  - SweptBlend Class
  - SweptProfile Class
  - SymbolicCurve Class
  - SymbolicCurveArray Class
  - SymbolicCurveArrayIterator Class
  - SynchronizeWithCentralOptions Class
  - TableCellCalculatedValueData Class
  - TableCellCombinedParameterData Class
  - TableCellStyle Class
  - TableCellStyleOverrideOptions Class
  - TableData Class
  - TableMergedCell Class
  - TableSectionData Class
  - TableView Class
  - TagMode Enumeration
  - TagOrientation Enumeration
  - TemporaryViewMode Enumeration
  - TemporaryViewModes Class
  - TessellatedBuildIssue Class
  - TessellatedBuildIssueType Enumeration
  - TessellatedFace Class
  - TessellatedShapeBuilder Class
  - TessellatedShapeBuilderFallback Enumeration
  - TessellatedShapeBuilderOutcome Enumeration
  - TessellatedShapeBuilderResult Class
  - TessellatedShapeBuilderTarget Enumeration
  - TextAlignFlags Enumeration
  - TextAlignMask Enumeration
  - TextBaselineStyle Enumeration
  - TextElement Class
  - TextElementBackground Enumeration
  - TextElementType Class
  - TextListStyle Enumeration
  - TextNode Class
  - TextNote Class
  - TextNoteLeaderStyles Enumeration
  - TextNoteLeaderTypes Enumeration
  - TextNoteOptions Class
  - TextNoteType Class
  - TextTreatment Enumeration
  - ThermalAsset Class
  - ThermalMaterialType Enumeration
  - ThermalProperties Class
  - TilePattern Class
  - TilePatterns Class
  - TilePatternsBuiltIn Enumeration
  - Transaction Class
  - TransactionGroup Class
  - TransactionStatus Enumeration
  - TransactWithCentralOptions Class
  - Transform Class
  - TransmissionData Class
  - TransmittedModelOptions Enumeration
  - TriangleInShellComponent Class
  - TriangulatedShellComponent Class
  - TriangulatedSolidOrShell Class
  - TriangulationInterface Class
  - TriangulationInterfaceForTriangulatedShellComponent Class
  - TriangulationInterfaceForTriangulatedSolidOrShell Class
  - TriOrQuadFacet Class
  - TypeBinding Class
  - UnderlayOrientation Enumeration
  - UnitFormatUtils Class
  - UnitGroup Enumeration
  - Units Class
  - UnitSymbolType Enumeration
  - UnitSystem Enumeration
  - UnitType Enumeration
  - UnitUtils Class
  - UpdaterData Class
  - UpdaterId Class
  - UpdaterInfo Class
  - UpdaterRegistry Class
  - UV Class
  - UVGridlineType Enumeration
  - ValueAtPointBase Class
  - ValueAtPointFlags Enumeration
  - ValueParsingOptions Class
  - VertexIndexPair Class
  - VertexIndexPairArray Class
  - VertexIndexPairArrayIterator Class
  - VertexPair Class
  - VerticalAlignmentStyle Enumeration
  - VerticalTextAlignment Enumeration
  - View Class
  - View3D Class
  - ViewCropRegionShapeManager Class
  - ViewDetailLevel Enumeration
  - ViewDiscipline Enumeration
  - ViewDisplayBackground Class
  - ViewDisplayBackgroundImageFlags Enumeration
  - ViewDisplayBackgroundType Enumeration
  - ViewDisplayEdges Enumeration
  - ViewDisplayModel Class
  - ViewDisplaySketchyLines Class
  - ViewDrafting Class
  - ViewDuplicateOption Enumeration
  - ViewFamily Enumeration
  - ViewFamilyType Class
  - ViewNavigationToolSettings Class
  - ViewNode Class
  - ViewOrientation3D Class
  - ViewPlan Class
  - ViewPlanType Enumeration
  - Viewport Class
  - ViewportRotation Enumeration
  - ViewSchedule Class
  - ViewScheduleExportOptions Class
  - ViewSection Class
  - ViewSet Class
  - ViewSetIterator Class
  - ViewShapeBuilder Class
  - ViewSheet Class
  - ViewSheetSet Class
  - ViewSheetSetting Class
  - ViewTemplateApplicationOption Enumeration
  - ViewType Enumeration
  - VirtualPrinterType Enumeration
  - Visibility Enumeration
  - Wall Class
  - WallFoundation Class
  - WallFoundationType Class
  - WallFunction Enumeration
  - WallKind Enumeration
  - WallLocationLine Enumeration
  - WallSide Enumeration
  - WallSweep Class
  - WallSweepInfo Class
  - WallSweepType Enumeration
  - WallType Class
  - WallUtils Class
  - WireframeBuilder Class
  - Workset Class
  - WorksetConfiguration Class
  - WorksetConfigurationOption Enumeration
  - WorksetDefaultVisibilitySettings Class
  - WorksetFilter Class
  - WorksetId Class
  - WorksetKind Enumeration
  - WorksetKindFilter Class
  - WorksetPreview Class
  - WorksetTable Class
  - WorksetVisibility Enumeration
  - WorksharingDisplayGraphicSettings Class
  - WorksharingDisplayMode Enumeration
  - WorksharingDisplaySettings Class
  - WorksharingSaveAsOptions Class
  - WorksharingTooltipInfo Class
  - WorksharingUtils Class
  - XYZ Class
  - ZoomFitType Enumeration
  - ZoomType Enumeration
- Autodesk.Revit.DB.Analysis Namespace
- Autodesk.Revit.DB.Architecture Namespace
- Autodesk.Revit.DB.Electrical Namespace
- Autodesk.Revit.DB.Events Namespace
- Autodesk.Revit.DB.ExtensibleStorage Namespace
- Autodesk.Revit.DB.ExternalService Namespace
- Autodesk.Revit.DB.Fabrication Namespace
- Autodesk.Revit.DB.IFC Namespace
- Autodesk.Revit.DB.Lighting Namespace
- Autodesk.Revit.DB.Macros Namespace
- Autodesk.Revit.DB.Mechanical Namespace
- Autodesk.Revit.DB.Plumbing Namespace
- Autodesk.Revit.DB.PointClouds Namespace
- Autodesk.Revit.DB.Structure Namespace
- Autodesk.Revit.DB.Structure.StructuralSections Namespace
- Autodesk.Revit.Exceptions Namespace
- Autodesk.Revit.UI Namespace
- Autodesk.Revit.UI.Events Namespace
- Autodesk.Revit.UI.Macros Namespace
- Autodesk.Revit.UI.Mechanical Namespace
- Autodesk.Revit.UI.Plumbing Namespace
- Autodesk.Revit.UI.Selection Namespace
- Autodesk.Revit.Utility Namespace
What's New

Create Method

Creates a new geometric ellipse or elliptical arc object.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 16.0.0.0 (16.0.0.0)
Since: 2014

Syntax

C#
public static Ellipse Create( XYZ center, double xRadius, double yRadius, XYZ xAxis, XYZ yAxis, double startParameter, double endParameter )

Visual Basic
Public Shared Function Create ( _ center As XYZ, _ xRadius As Double, _ yRadius As Double, _ xAxis As XYZ, _ yAxis As XYZ, _ startParameter As Double, _ endParameter As Double _ ) As Ellipse

Visual C++
public: static Ellipse^ Create( XYZ^ center, double xRadius, double yRadius, XYZ^ xAxis, XYZ^ yAxis, double startParameter, double endParameter )

Parameters

center: Type: Autodesk.Revit.DB..::..XYZ
The center.

xRadius: Type: System..::..Double
The x vector radius of the ellipse.

yRadius: Type: System..::..Double
The y vector radius of the ellipse.

xAxis: Type: Autodesk.Revit.DB..::..XYZ
The x axis to define the ellipse plane. Must be normalized.

yAxis: Type: Autodesk.Revit.DB..::..XYZ
The y axis to define the ellipse plane. Must be normalized.

startParameter: Type: System..::..Double
The raw parameter value at the start of the ellipse.

endParameter: Type: System..::..Double
The raw parameter value at the end of the ellipse.

Return Value

The new ellipse or elliptical arc.

Remarks

If the angle range is equal to or greater than 2 * PI, the curve will be automatically converted to an unbounded ellipse.

Exceptions

Exception	Condition
Autodesk.Revit.Exceptions..::..ArgumentNullException	A non-optional argument was NULL
Autodesk.Revit.Exceptions..::..ArgumentOutOfRangeException	The given value for xRadius must be greater than 0 and no more than 30000 feet. -or- The given value for yRadius must be greater than 0 and no more than 30000 feet. -or- xAxis is not length 1.0. -or- yAxis is not length 1.0.
Autodesk.Revit.Exceptions..::..ArgumentsInconsistentException	The vectors xAxis and yAxis are not perpendicular. -or- Start parameter must be less than end parameter. -or- Curve length is too small for Revit's tolerance (as identified by Application.ShortCurveTolerance).

See Also

Autodesk.Revit.DB Namespace

M:Autodesk.Revit.DB.Ellipse.Create(Autodesk.Revit.DB.XYZ,System.Double,System.Double,Autodesk.Revit.DB.XYZ,Autodesk.Revit.DB.XYZ,System.Double,System.Double)