[IfcCoordinateReferenceSystem.VerticalDatum property VerticalDatum public IfcIdentifier VerticalDatum { get; set; } 也可以看看 class IfcIdentifier class IfcCoordinateReferenceSystem 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
