本篇介紹如何從文件中檢索空間結構。IFC中的空間結構表示層次結構的嵌套結構，表示項目，站點，建筑物，樓層和空間。如果您查看IFC文檔，?您會發現建筑物可以包含樓層以及其他建筑物，樓層可以包含空間以及其他樓層等。此類關系也使用IfcRelAggregates建模，?但如果要查找特定空間結構中包含的元素，則將其建模為?IfcRelContainedInSpatialStructure，?因此它取決于您要查找的內容。下面的示例演示如何使用上述兩種關系搜索和遍歷數據以獲得完整的層次結構。
using System; using System.Linq; using Xbim.Ifc; using Xbim.Ifc4.Interfaces;namespace BasicExamples {class SpatialStructureExample{public static void Show(){const string file = "SampleHouse.ifc";using (var model = IfcStore.Open(file)){var project = model.Instances.FirstOrDefault<IIfcProject>();PrintHierarchy(project, 0);}}private static void PrintHierarchy(IIfcObjectDefinition o, int level){Console.WriteLine(string.Format("{0}{1} [{2}]", GetIndent(level), o.Name, o.GetType().Name));// 只有空間元素可以包含建筑元素var spatialElement = o as IIfcSpatialStructureElement;if (spatialElement != null){// 使用 IfcRelContainedInSpatialElement 獲取包含的元素var containedElements = spatialElement.ContainsElements.SelectMany(rel => rel.RelatedElements);foreach (var element in containedElements)Console.WriteLine(string.Format("{0} ->{1} [{2}]", GetIndent(level), element.Name, element.GetType().Name));}// 使用 IfcRelAggregares 獲取空間結構元素的空間分解foreach (var item in o.IsDecomposedBy.SelectMany(r => r.RelatedObjects))PrintHierarchy(item, level +1);}private static string GetIndent(int level){var indent = "";for (int i = 0; i < level; i++)indent += " ";return indent;}} }
輸出結果如下：
Project Number [IfcProject]Default [IfcSite][IfcBuilding]Ground Floor [IfcBuildingStorey]->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285330 [IfcWall]->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285395 [IfcWall]->Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285459 [IfcWall]->Curtain Wall:Curtain_Wall-Exterior_Glazing:285582 [IfcCurtainWall]->Curtain Wall:Curtain_Wall-Exterior_Glazing:285684 [IfcCurtainWall]->Basic Wall:Wall-Partn_12P-70MStd-12P:285792 [IfcWallStandardCase]->Basic Wall:Wall-Partn_12P-70MStd-12P:285846 [IfcWallStandardCase]->Doors_ExtDbl_Flush:1810x2110mm:285860 [IfcDoor]->Doors_IntSgl:810x2110mm:285959 [IfcDoor]->Doors_IntSgl:810x2110mm:285996 [IfcDoor]->Windows_Sgl_Plain:1810x1210mm:286105 [IfcWindow]->Windows_Sgl_Plain:1810x1210mm:286188 [IfcWindow]->Windows_Sgl_Plain:1810x1210mm:286238 [IfcWindow]->Compound Ceiling:Plain:286319 [IfcCovering]->Compound Ceiling:Plain:286329 [IfcCovering]->Compound Ceiling:Plain:286337 [IfcCovering]->Floor:Floor-Grnd-Susp_65Scr-80Ins-100Blk-75PC:286349 [IfcSlab]->Windows_Sgl_Plain:1810x1210mm:287567 [IfcWindow]1 - Living room [IfcSpace]->Furniture_Table_Dining_w-Chairs_Rectangular:2000x1000x750mm_w-6_Seats:289768 [IfcFurniture]->Chair - Dining:Chair - Dining:289769 [IfcFurniture]->Chair - Dining:Chair - Dining:289770 [IfcFurniture]->Chair - Dining:Chair - Dining:289771 [IfcFurniture]->Chair - Dining:Chair - Dining:289772 [IfcFurniture]->Chair - Dining:Chair - Dining:290097 [IfcFurniture]->Chair - Dining:Chair - Dining:290098 [IfcFurniture]->Furniture_Couch_Viper:2290x950x340mm:290852 [IfcFurniture]->Furniture_Chair_Viper:1120x940x350mm:291916 [IfcFurniture]->Furniture_Chair_Viper:1120x940x350mm:292127 [IfcFurniture]->Furniture_Table_Coffee_1:1200x550x450mm:293046 [IfcFurniture]->Furniture_Piano:1370x600x1170mm:293961 [IfcFurniture]2 - Bedroom [IfcSpace]->Furniture_Desk:1525x762mm:287689 [IfcFurniture]->Furniture_Bed_1:1525x2007x355mm-Queen:295878 [IfcFurniture]3 - Entrance hall [IfcSpace]Roof [IfcBuildingStorey]->Basic Roof:Roof_Flat-4Felt-150Ins-50Scr-150Conc-12Plr:286419 [IfcRoof]->Floor:Simple floor:295048 [IfcSlab]4 - Roof [IfcSpace]
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