[IfcPresentationLayerAssignment.AssignedItems property 已分配项目 public IfcCollection<IfcLayeredItem> AssignedItems { get; set; } 也可以看看 class IfcCollection<T> class IfcLayeredItem class IfcPresentationLayerAssignment 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
