Namespaces
- Autodesk.Revit.ApplicationServices
- Autodesk.Revit.Attributes
- Autodesk.Revit.Creation
- Autodesk.Revit.DB
  - 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
  - AngularDimension Class
  - AnnotationMultipleAlignmentUtils Class
  - AnnotationSymbol Class
  - AnnotationSymbolType Class
  - APIObject Class
  - AppearanceAssetElement Class
  - Arc Class
  - ArcLengthDimension 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
  - AttachmentLocation Enumeration
  - AttachmentType Enumeration
  - AutomaticConnectionBehaviorType Enumeration
  - AXMImportOptions Class
  - BackClippingParam Enumeration
  - BackgroundImageFit Enumeration
  - BackgroundSettings Class
  - BackgroundStyle Enumeration
  - BarTypeDiameterOptions Class
  - BaseArray Class
  - BaseExportOptions Class
  - BaseImportOptions Class
  - BaseLoadOn Enumeration
  - BasePoint Class
  - BasicFileInfo Class
  - BeamSystem Class
  - BeamSystemJustifyType Enumeration
  - BeamSystemType Class
  - BehaviorType Enumeration
  - BendingDetailPositionOptions Enumeration
  - BIMExportOptions Class
  - Binding Class
  - BindingMap Class
  - Blend Class
  - BooleanOperationsType Enumeration
  - BooleanOperationsUtils Class
  - BorderTile Enumeration
  - BoundarySegment Class
  - BoundaryValidation Class
  - BoundingBoxContainsPointFilter Class
  - BoundingBoxIntersectsFilter Class
  - BoundingBoxIsInsideFilter Class
  - BoundingBoxUV Class
  - BoundingBoxXYZ Class
  - BoxPlacement Enumeration
  - BRepBuilder Class
  - BRepBuilderEdgeGeometry Class
  - BRepBuilderGeometryId Class
  - BRepBuilderOutcome Enumeration
  - BRepBuilderPersistentIds Class
  - BRepBuilderState Enumeration
  - BRepBuilderSurfaceGeometry Class
  - BRepType Enumeration
  - BrowserOrganization Class
  - BrowserOrganizationType Enumeration
  - BuildingPadType Class
  - BuildingType Enumeration
  - BuiltInCategory Enumeration
  - BuiltInFailures Class
  - BuiltInFailures.AlignmentFailures 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.DirectContext3DFailures Class
  - BuiltInFailures.DirectShapeFailures 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.ExternalResourceReferenceFailures 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.ForeignFileFailures 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.LevelAssociationFailures Class
  - BuiltInFailures.LevelFailures Class
  - BuiltInFailures.LinkFailures Class
  - BuiltInFailures.LoadFailures Class
  - BuiltInFailures.LooseDimensionFailures Class
  - BuiltInFailures.MacroFailures Class
  - BuiltInFailures.MassFailures Class
  - BuiltInFailures.MatchlineFailures Class
  - BuiltInFailures.MechanicalFailures Class
  - BuiltInFailures.MEPCalculationFailures Class
  - BuiltInFailures.MEPFabricationFailures Class
  - BuiltInFailures.MEPSupportFailures Class
  - BuiltInFailures.MirrorFailures Class
  - BuiltInFailures.MultiReferenceAnnotationFailures Class
  - BuiltInFailures.NumberingFailures Class
  - BuiltInFailures.OffsetFacesCellLegacyFailures Class
  - BuiltInFailures.OpeningFailures Class
  - BuiltInFailures.OverlapFailures Class
  - BuiltInFailures.ParameterFailures Class
  - BuiltInFailures.PartMakerMethodForMergePartFailures Class
  - BuiltInFailures.PartMakerMethodForWallFailures Class
  - BuiltInFailures.PathFailures Class
  - BuiltInFailures.PathOfTravelFailures Class
  - BuiltInFailures.PerformanceFailures Class
  - BuiltInFailures.PipingFailures Class
  - BuiltInFailures.PlanRegionFailures Class
  - BuiltInFailures.PointFailures Class
  - BuiltInFailures.ProfileFailures Class
  - BuiltInFailures.PropertySetElementFailures Class
  - BuiltInFailures.RebarBendingDetailFailures Class
  - BuiltInFailures.RebarCouplerFailures 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.ScaleFailures Class
  - BuiltInFailures.ScheduleViewFailures Class
  - BuiltInFailures.SculptingFailures Class
  - BuiltInFailures.SectionViewFailures Class
  - BuiltInFailures.SelectionFailures Class
  - BuiltInFailures.SharedCoordinatesFailures Class
  - BuiltInFailures.SheetCollectionFailures 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.SplitSketchBasedElementFailures Class
  - BuiltInFailures.SplitToposolidFailures Class
  - BuiltInFailures.StairRampFailures Class
  - BuiltInFailures.SteelElementFailures Class
  - BuiltInFailures.SteelElementsFailures Class
  - BuiltInFailures.StructuralAssetFailures Class
  - BuiltInFailures.StructuralConnectionFailures Class
  - BuiltInFailures.StructuralCustomConnectionFailures Class
  - BuiltInFailures.StructuralLoadFailures Class
  - BuiltInFailures.SubRegionFailures 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.UniqueElementFailures Class
  - BuiltInFailures.ViewFailures Class
  - BuiltInFailures.ViewSheetFailures Class
  - BuiltInFailures.WallFailures Class
  - BuiltInFailures.WallJoinFailures Class
  - BuiltInFailures.WallJoinRoofFailures Class
  - BuiltInFailures.WorksharingFailures Class
  - BuiltInFailures.ZoneFailures Class
  - BuiltInParameter Enumeration
  - CADExportOptions Class
  - CADLinkOperations Class
  - CADLinkOptions Class
  - CADLinkType Class
  - CameraInfo Class
  - CancellationListener 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
  - ClosestPointsPairBetweenTwoCurves Class
  - Color Class
  - ColorBackgroundSettings Class
  - ColorDepthType Enumeration
  - ColorFillLegend Class
  - ColorFillScheme Class
  - ColorFillSchemeEntry Class
  - ColorOptions Class
  - ColorWithTransparency Class
  - ColumnAttachment Class
  - ColumnAttachmentCutStyle Enumeration
  - ColumnAttachmentJustification Enumeration
  - CombinableElement Class
  - CombinableElementArray Class
  - CombinableElementArrayIterator Class
  - ComponentRepeater Class
  - ComponentRepeaterIterator Class
  - ComponentRepeaterSlot Class
  - ComponentRotation Enumeration
  - CompoundStructure Class
  - CompoundStructureError Enumeration
  - CompoundStructureLayer Class
  - ConfigurationReloadInfo Class
  - ConicalFace Class
  - ConicalSurface 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
  - ContourSetting Class
  - ContourSettingItem Class
  - ContourSettingItemType Enumeration
  - 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
  - CurvedEdgeConditionParam Enumeration
  - CurveElement Class
  - CurveElementFilter Class
  - CurveElementType Enumeration
  - CurveExtents Class
  - CurveLoop Class
  - CurveLoopIterator Class
  - CurveLoopsProfile Class
  - CurveNode Class
  - CurveProjectionType Enumeration
  - CurveUV Class
  - CustomExporter Class
  - CustomFieldData Class
  - CustomSubCategoryId Enumeration
  - CutFailureReason Enumeration
  - CylindricalFace Class
  - CylindricalHelix Class
  - CylindricalSurface Class
  - DataConversionMonitorScope Class
  - DataExchangeMessageId Enumeration
  - DataExchangeMessageSeverity Enumeration
  - DataExchangeMessageVerbosity Enumeration
  - DatumEnds Enumeration
  - DatumExtentType Enumeration
  - DatumPlane Class
  - DecimalSymbol Enumeration
  - DefaultDivideSettings Class
  - DefaultOpenFromCloudCallback Class
  - Definition Class
  - DefinitionBindingMap Class
  - DefinitionBindingMapIterator Class
  - DefinitionFile Class
  - DefinitionGroup Class
  - DefinitionGroups Class
  - Definitions Class
  - DeleteElements Class
  - DeleteWorksetOption Enumeration
  - DeleteWorksetSettings 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
  - DimensionEqualityLabelFormatting Class
  - DimensionSegment Class
  - DimensionSegmentArray Class
  - DimensionSegmentArrayIterator Class
  - DimensionShape Enumeration
  - DimensionStyleType Enumeration
  - DimensionType Class
  - DirectShape Class
  - DirectShapeLibrary Class
  - DirectShapeOptions Class
  - DirectShapeReferenceOptions Class
  - DirectShapeReferencingOption Enumeration
  - DirectShapeRoomBoundingOption Enumeration
  - DirectShapeTargetViewType Enumeration
  - DirectShapeType Class
  - DirectShapeTypeOptions Class
  - DirectShapeTypeUserAssignability Enumeration
  - DisableAnalyticalModelCB Class
  - DisciplineTypeId Class
  - DisplacementElement Class
  - DisplacementPath Class
  - DisplacementPathStyle Enumeration
  - DisplayStyle Enumeration
  - DisplayUnit Enumeration
  - DistanceMeasuredFrom Enumeration
  - DistributionOfNormals Enumeration
  - DividedPath Class
  - DividedPathMeasurementType Enumeration
  - DividedSurface Class
  - Document Class
  - DocumentDifference Class
  - DocumentPreviewSettings Class
  - DocumentSet Class
  - DocumentSetIterator Class
  - DocumentType Enumeration
  - DocumentValidation Class
  - DocumentVersion Class
  - Domain Enumeration
  - DoorEvacuationExitType Enumeration
  - DoubleArray Class
  - DoubleArrayIterator Class
  - DoubleParameterValue Class
  - DrawLayer Enumeration
  - 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
  - EdgeEndPoint Class
  - EditScope Class
  - Element Class
  - ElementArray Class
  - ElementArrayIterator Class
  - ElementBinding Class
  - ElementCategoryFilter Class
  - ElementClassFilter Class
  - ElementDesignOptionFilter Class
  - ElementFilter Class
  - ElementId Class
    - ElementId Constructor
    - ElementId Properties
    - ElementId Methods
    - ElementId Operators
      - Equality Operator
      - GreaterThan Operator
      - GreaterThanOrEqual Operator
      - Inequality Operator
      - LessThan Operator
      - LessThanOrEqual Operator
  - ElementIdParameterValue Class
  - ElementIdSetFilter Class
  - ElementIntersectsElementFilter Class
  - ElementIntersectsFilter Class
  - ElementIntersectsSolidFilter Class
  - ElementIsCurveDrivenFilter Class
  - ElementIsElementTypeFilter Class
  - ElementLevelFilter Class
  - ElementLogicalFilter Class
  - ElementMulticategoryFilter Class
  - ElementMulticlassFilter Class
  - ElementNode 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
  - EndCapCondition Enumeration
  - EntryAndSchemeConsistency Enumeration
  - EvaluatedParameter Class
  - ExclusionFilter Class
  - ExportColorMode Enumeration
  - ExportColumnHeaders Enumeration
  - ExportDGNSettings Class
  - ExportDWGSettings Class
  - ExportEnergyModelType Enumeration
  - ExportFontInfo Class
  - ExportFontKey Class
  - ExportFontTable Class
  - ExportFontTableIterator Class
  - ExportIFCCategoryInfo Class
  - ExportIFCCategoryKey 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
  - ExportPDFSettings Class
  - ExportRange Enumeration
  - ExportResolution Enumeration
  - ExportSheetType Enumeration
  - ExportTextQualifier Enumeration
  - ExportUnit Enumeration
  - ExportUtils Class
  - ExternalDBApplicationResult Enumeration
  - ExternalDefinition Class
  - ExternalDefinitionCreationOptions Class
  - ExternalDefinitions Class
  - ExternalFileReference Class
  - ExternalFileReferenceType Enumeration
  - ExternalFileUtils Class
  - ExternalGeometryId Class
  - ExternallyTaggedBRep Class
  - ExternallyTaggedGeometryObject Class
  - ExternallyTaggedGeometryValidation Class
  - ExternallyTaggedNonBRep Class
  - ExternallyTaggedNonBReps Class
  - ExternallyTaggedNonBRepUsage Enumeration
  - ExternalResourceBrowserData Class
  - ExternalResourceLoadContent Class
  - ExternalResourceLoadContext Class
  - ExternalResourceLoadData Class
  - ExternalResourceLoadStatus Enumeration
  - ExternalResourceMatchOptions Class
  - ExternalResourceReference Class
  - ExternalResourceServerExtensions Class
  - ExternalResourceServerUtils Class
  - ExternalResourceServiceUtils Class
  - ExternalResourceSubFolder Class
  - ExternalResourceType Class
  - ExternalResourceTypes Class
  - ExternalResourceTypes.BuiltInExternalResourceTypes Class
  - ExternalResourceUIBrowseResultType Enumeration
  - ExternalResourceUtils Class
  - Extrusion Class
  - ExtrusionAnalyzer Class
  - ExtrusionAnalyzerFaceAlignment Enumeration
  - ExtrusionRoof Class
  - FabricationAncillaryUsage Class
  - FabricationConfiguration Class
  - FabricationConfigurationInfo Class
  - FabricationConnectorInfo Class
  - FabricationDimensionDefinition Class
  - FabricationDimensionType Enumeration
  - FabricationDimensionUnitType Enumeration
  - FabricationHostedInfo Class
  - FabricationItemFile Class
  - FabricationItemFolder Class
  - FabricationMaterialType Enumeration
  - FabricationPart Class
  - FabricationPartType Class
  - FabricationRodInfo Class
  - FabricationService Class
  - FabricationServiceButton Class
  - FabricationServiceSettings Class
  - FabricationVersionInfo Class
  - Face Class
  - FaceArray Class
  - FaceArrayIterator Class
  - FaceDetailNode Class
  - FaceEdgeNode Class
  - FaceIntersectionFaceResult Enumeration
  - FaceNode Class
  - FaceSecondDerivatives Class
  - FaceSilhouetteNode Class
  - FaceSplitter Class
  - FacetingUtils Class
  - FaceToposolid 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
  - FamilyInstanceReferenceType Enumeration
  - FamilyManager Class
  - FamilyNestingBehavior Enumeration
  - 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
  - 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
  - FilterGlobalParameterAssociationRule Class
  - FilterIntegerRule Class
  - FilterInverseRule Class
  - FilterNumericEquals Class
  - FilterNumericGreater Class
  - FilterNumericGreaterOrEqual Class
  - FilterNumericLess Class
  - FilterNumericLessOrEqual Class
  - FilterNumericRuleEvaluator Class
  - FilterNumericValueRule Class
  - FilterOperatorAndTextString 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
  - ForgeTypeId Class
  - Form Class
  - FormArray Class
  - FormArrayIterator Class
  - FormatOptions Class
  - FormatStatus Enumeration
  - FormattedText Class
  - FormatValueOptions Class
  - FormulaManager Class
  - FormUtils Class
  - Frame Class
  - FramingShapeClassification Enumeration
  - 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
  - GroupLoadOptions Class
  - GroupNode Class
  - GroupSet Class
  - GroupSetIterator Class
  - GroupType Class
  - GroupTypeId Class
  - GuidEnum Class
  - HasNoValueFilterRule Class
  - HasValueFilterRule Class
  - HermiteFace Class
  - HermiteSpline Class
  - HermiteSplineTangents Class
  - HermiteSurface 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
  - ICustomFieldProperties Interface
  - IDataConversionMonitor Interface
  - IDuplicateTypeNamesHandler Interface
  - IExportContext Interface
  - IExportContext2D Interface
  - IExportContextBase Interface
  - IExtension Interface
  - IExternalDBApplication Interface
  - IExternalResourceServer Interface
  - IFailuresPreprocessor Interface
  - IFailuresProcessor Interface
  - IFamilyLoadOptions Interface
  - IFCBuiltInCategoryKey Class
  - IFCCategoryTemplate Class
  - IFCExportElement Enumeration
  - IFCExportElementType Enumeration
  - IFCExportOptions Class
  - IFCVersion Enumeration
  - IGetLocalPathForOpenCallback Interface
  - ImageBackgroundSettings Class
  - ImageExportOptions Class
  - ImageFileType Enumeration
  - ImageInstance Class
  - ImagePlacementOptions Class
  - ImageResolution Enumeration
  - ImageType Class
  - ImageTypeOptions Class
  - ImageTypeSource Enumeration
  - ImageTypeStatus Enumeration
  - ImageView Class
  - IModelExportContext Interface
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WhatsNew
Revit .NET 8 Upgrade Tips

ElementId.LessThan Operator

Revit 2025.3 API

ElementIdLessThan Operator

Determines whether this element id is less than another element id.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)

Syntax

public static bool operator <(
	ElementId elementId1,
	ElementId elementId2
)

Public Shared Operator < ( 
	elementId1 As ElementId,
	elementId2 As ElementId
) As Boolean

public:
static bool operator <(
	ElementId^ elementId1, 
	ElementId^ elementId2
)

static let inline (<)
        elementId1 : ElementId * 
        elementId2 : ElementId  : bool

Parameters

elementId1 ElementId: The first ElementId.
elementId2 ElementId: The second ElementId.

Return Value

Boolean
True if the first element id is less than the second element id, otherwise, false.

Reference

ElementId Class

Autodesk.Revit.DB Namespace

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M:Autodesk.Revit.DB.ElementId.op_LessThan(Autodesk.Revit.DB.ElementId,Autodesk.Revit.DB.ElementId)