添加项目文件。

Sai.Toolkit.Revit/Assist/ImportInstanceAssist.cs

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+using System.IO;
+using System.Text;
+
+using Autodesk.Revit.DB;
+
+namespace Sai.Toolkit.Revit.Assist;
+
+public static class ImportInstanceAssist
+{
+    /// <summary>
+    /// 获取块参照
+    /// </summary>
+    /// <param name="dwg"></param>
+    /// <param name="reference">选择的块参考</param>
+    /// <returns></returns>
+    public static List<GeometryInstance> GetBlocksByRef(this ImportInstance dwg, Reference reference)
+    {
+        var geoElem = dwg.get_Geometry(new Options());
+        //dwg块
+        var geoObj = dwg.GetGeometryObjectFromReference(reference);
+        GeometryInstance referBlock = null;
+        foreach (var obj in geoElem)
+        {
+            if (obj is GeometryInstance dwgGeo) //dwg几何实例
+            {
+                foreach (var block in dwgGeo.SymbolGeometry) //块
+                {
+                    if (block is GeometryInstance ins)
+                    {
+                        if (ins.GetHashCode() == geoObj.GetHashCode())
+                        {
+                            referBlock = ins;
+                            break;
+                        }
+
+                        foreach (var subBlock in ins.SymbolGeometry) //嵌套块/子块
+                        {
+                            if (subBlock is GeometryInstance subIns && subIns.GetHashCode() == geoObj.GetHashCode())
+                            {
+                                referBlock = ins;
+                                break;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if (referBlock == null)
+        {
+            return null;
+        }
+
+        List<GeometryInstance> blocks = [];
+        foreach (var obj in geoElem)
+        {
+            if (obj is GeometryInstance dwgGeo)
+            {
+                foreach (var block in dwgGeo.SymbolGeometry) //图元
+                {
+#if REVIT2018 || REVIT2020
+                    if (block is GeometryInstance ins && ins.Symbol.Name == referBlock.Symbol.Name)
+                    {
+                        blocks.Add(ins);
+                    }
+#elif REVIT2025
+                    if (block is GeometryInstance ins && ins.GetSymbolGeometryId().SymbolId == referBlock.GetSymbolGeometryId().SymbolId)
+                    {
+                        blocks.Add(ins);
+                    }
+#endif
+
+                }
+            }
+        }
+        return blocks;
+    }
+    public static CurveByPoints ConvertToMassCurve(this ImportInstance importInstance)
+    {
+        var famdoc = importInstance.Document;
+        var curves = importInstance.GetCurves();
+        var array = new ReferencePointArray();
+        foreach (var c in curves)
+        {
+            var referencePoint = famdoc.FamilyCreate.NewReferencePoint(c.GetEndPoint(0));
+            array.Append(referencePoint);
+        }
+        array.Append(famdoc.FamilyCreate.NewReferencePoint(curves.Last().GetEndPoint(1)));
+
+        return famdoc.FamilyCreate.NewCurveByPoints(array);
+    }
+    /// <summary>
+    /// 获取dwg的曲线
+    /// </summary>
+    /// <param name="importInstance"></param>
+    /// <returns></returns>
+    public static List<Curve> GetCurves(this ImportInstance importInstance)
+    {
+        List<Curve> curves = [];
+        var geoElem = importInstance.get_Geometry(new Options());
+        foreach (var geomObj in geoElem)
+        {
+            var geomInstance = geomObj as GeometryInstance;
+
+            if (geomInstance != null)
+            {
+                foreach (var instObj in geomInstance.GetInstanceGeometry())
+                {
+                    //polyLine拆成线
+                    if (instObj is PolyLine line)
+                    {
+                        var poly = line.GetCoordinates();
+                        for (var i = 0; i < poly.Count - 1; i++)
+                        {
+                            var l = Line.CreateBound(poly[i], poly[i + 1]);
+                            curves.Add(l);
+                        }
+                    }
+
+                    if (instObj is Arc arc)
+                    {
+                        curves.Add(arc);
+                    }
+                }
+            }
+        }
+
+        return curves;
+    }
+
+    /// <summary>
+    /// 获取包含的图块，图层
+    /// </summary>
+    /// <param name="dwg"></param>
+    public static StringBuilder GetDwgInfo(this ImportInstance dwg)
+    {
+        StringBuilder sb = new();
+        var geoElem = dwg.get_Geometry(new Options());
+        foreach (var obj in geoElem)
+        {
+            if (obj is GeometryInstance instance) //dwg
+            {
+                foreach (var obj1 in instance.SymbolGeometry) //图元
+                {
+                    if (obj1 is GeometryInstance block)
+                    {
+                        var graphicsStyle = dwg.Document.GetElement(obj1.GraphicsStyleId) as GraphicsStyle;
+                        var layerName = graphicsStyle?.GraphicsStyleCategory.Name;
+#if REVIT2018 || REVIT2020
+                        sb.AppendLine($"{block.Symbol.Name}({obj1.GraphicsStyleId})-{layerName}-{block.Symbol.UniqueId}");
+#elif REVIT2025
+                        var id = block.GetSymbolGeometryId().SymbolId;
+                        var elem = dwg.Document.GetElement(id);
+                        sb.AppendLine($"{elem.Name}({obj1.GraphicsStyleId})-{layerName}-{elem.UniqueId}");
+#endif
+                    }
+                }
+            }
+        }
+        return sb;
+    }
+
+    /// <summary>
+    /// 获取dwg所在的路径
+    /// </summary>
+    /// <param name="dwg"></param>
+    /// <returns></returns>
+    public static string GetDwgPath(this ImportInstance dwg)
+    {
+        var cadLinkType = dwg.Document.GetElement(dwg.GetTypeId()) as CADLinkType;
+        var filePath = cadLinkType?.GetExternalFileReference().GetLinkedFileStatus() == LinkedFileStatus.Loaded
+            ? ModelPathUtils.ConvertModelPathToUserVisiblePath(cadLinkType?.GetExternalFileReference().GetAbsolutePath())
+            : throw new InvalidOperationException("该dwg不是链接");
+        return !File.Exists(filePath) ? throw new InvalidOperationException("链接文件路径不存在") : filePath;
+    }
+    /// <summary>
+    /// 获取参考所在的图层名称
+    /// </summary>
+    /// <param name="dwg"></param>
+    /// <param name="reference"></param>
+    /// <returns></returns>
+    public static string GetLayerName(this ImportInstance dwg, Reference reference)
+    {
+        var obj = dwg.GetGeometryObjectFromReference(reference);
+        var style = dwg.Document.GetElement(obj.GraphicsStyleId) as GraphicsStyle;
+        return style?.GraphicsStyleCategory.Name;
+    }
+
+    /// <summary>
+    /// 获取变换
+    /// </summary>
+    /// <param name="importInstance"></param>
+    /// <param name="reference"></param>
+    /// <returns></returns>
+    public static Transform GetTransform(this ImportInstance importInstance, Reference reference)
+    {
+        var geoObj = importInstance.GetGeometryObjectFromReference(reference);
+        var geomInstance = geoObj as GeometryInstance;
+        return geomInstance?.Transform;
+    }
+}