[IfcPropertySetDefinition.DefinesOccurrence property 定义发生 public IfcCollection<IfcRelDefinesByProperties> DefinesOccurrence { get; } 也可以看看 class IfcCollection<T> class IfcRelDefinesByProperties class IfcPropertySetDefinition 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
