Revit API—元素操作（Element）

ElementFilter categoryfilter = new ElementCategoryFilter(BuiltInCategory.OST_GenericModel);
                ElementFilter classfilter = new ElementClassFilter(typeof(FamilyInstance));
                ElementFilter logicfilter = new LogicalAndFilter(classfilter, categoryfilter);
                FilteredElementCollector filteredcollector = new FilteredElementCollector(doc);
                var filteredelement = filteredcollector.WherePasses(logicfilter);
                foreach (Element elem in filteredelement)
                {
                    if (elem != null)
                    {
                        var elemid = elem.Id;
                        var elemlocation = elem.Location as LocationPoint;
                        var elempiont = elemlocation.Point;
                        elemlocation.Move(new XYZ(-elempiont.X, -elempiont.Y, -elempiont.Z));
                        TaskDialog.Show("Show", elemid.ToString() + elemlocation.Point);
                        //ElementTransformUtils.MoveElement(doc, elemid, new XYZ(0, 0, 0));
                        break;
                    }

                List<ElementId> elementsToGroup = new List<ElementId>();
                var elemIds = uidoc.Selection.GetElementIds();
                foreach (ElementId elemid in elemIds)
                {
                    elementsToGroup.Add(elemid);
                }
                Group group = doc.Create.NewGroup(elementsToGroup);