如果链接模型使用的是默认的【自动 - 原点到原点】
则转换前后坐标是一致的，否则，坐标是不一致的
下面是对链接文件中的管道的两个端点的坐标的转换：
using System;using Autodesk.Revit.UI;using Autodesk.Revit.DB;using Autodesk.Revit.Attributes;using Autodesk.Revit.UI.Selection;using System.Windows.Forms;using Autodesk.Revit.DB.Plumbing;namespace TransformCoordinate{[Transaction(TransactionMode.Manual)]public class TransforCoor : IExternalCommand{public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements){try{UIDocument uiDoc = commandData.Application.ActiveUIDocument;Document doc = uiDoc.Document;Reference reference = uiDoc.Selection.PickObject(ObjectType.LinkedElement, new SelectionLinkFilter(), "select link Pipe.");Transform transform = null;if (reference != null){Element elemSelect = doc.GetElement(reference);RevitLinkInstance linkInstance = elemSelect as RevitLinkInstance;transform = linkInstance.GetTransform();Document linkDoc = linkInstance.GetLinkDocument();Element linkPipe = linkDoc.GetElement(reference.LinkedElementId);if(linkPipe == null){MessageBox.Show("linkPipe IS NULL");return Result.Failed;}if (linkPipe.Location as LocationCurve == null){MessageBox.Show("pipe line IS NULL");return Result.Failed;}Line line = (linkPipe.Location as LocationCurve).Curve as Line;XYZ point1 = line.GetEndPoint(0);XYZ point2 = line.GetEndPoint(1);XYZ tPoint1 = transform.OfPoint(point1);XYZ tPoint2 = transform.OfPoint(point2);MessageBox.Show("Point1:" + point1.ToString() + Environment.NewLine + "tPoint1:" + tPoint1.ToString());MessageBox.Show("Point2:" + point2.ToString() + Environment.NewLine + "tPoint2:" + tPoint2.ToString());}return Result.Succeeded;}catch (Exception e){MessageBox.Show(e.ToString(), "Exception");return Result.Failed;}}}public class SelectionLinkFilter : ISelectionFilter{public RevitLinkInstance rvtIns;Document linkDoc = null;public bool AllowElement(Element elem){if (elem is RevitLinkInstance){rvtIns = elem as RevitLinkInstance;linkDoc = rvtIns.GetLinkDocument();return true;}return false;}public bool AllowReference(Reference reference, XYZ position){if (linkDoc.GetElement(reference.LinkedElementId) is Pipe){return true;}return false;}}}
详细参照：/Dai_Aixy/article/details/103150898?utm_medium=distribute.pc_relevant.none-task-blog-2defaultbaidujs_baidulandingword~default-0-103150898-blog-124303379.pc_relevant_default&spm=1001.2101.3001.4242.1&utm_relevant_index=2
