Revit二次开发——读取cad中的文字信息

Revit读取cad的文字信息需要借助Teigha的开源dll，在程序中添加下图中红色框的dll文件的引用，其他的dll文件全部放在同一个文件夹中即可，运行的时候，会自动把这些dll文件全部复制到bin文件当中，同时，在Revit中运行插件，Revit也会自动加载这些dll文件。

以下是关键方法，在Revit里读取cad文字信息，图层信息，几何信息等。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using CreatBridgeForRevit2018.ElementsSelect;
using CreatBridgeForRevit2018.Filter;
using Teigha.Runtime;
using Teigha.DatabaseServices;
using System.IO;
using System.Collections;
using Teigha.Geometry;

namespace CreatBridgeForRevit2018.ReadCAD
{
 class ReadCADUtils
 {
 /// <summary>
 /// 取得链接cad的路径
 /// </summary>
 /// <param name="cadLinkTypeID"></param>
 /// <param name="revitDoc"></param>
 /// <returns></returns>
 public string GetCADPath(ElementId cadLinkTypeID,Document revitDoc)
 {
 CADLinkType cadLinkType = revitDoc.GetElement(cadLinkTypeID) as CADLinkType;
 return ModelPathUtils.ConvertModelPathToUserVisiblePath(cadLinkType.GetExternalFileReference().GetAbsolutePath());
 }

 /// <summary>
 /// 取得CAD的文字信息
 /// </summary>
 /// <param name="dwgFile"></param>
 /// <returns></returns>
 public List<CADTextModel> GetCADTextInfo(string dwgFile)
 {
 List<CADTextModel> listCADModels = new List<CADTextModel>(); 
 using (new Services())
 {
 using (Database database = new Database(false, false))
 {
 database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
 using (var trans = database.TransactionManager.StartTransaction())
 {
 using (BlockTable table = (BlockTable)database.BlockTableId.GetObject(OpenMode.ForRead))
 {
 using (SymbolTableEnumerator enumerator = table.GetEnumerator())
 {
 StringBuilder sb = new StringBuilder();
 while (enumerator.MoveNext())
 {
 using (BlockTableRecord record = (BlockTableRecord)enumerator.Current.GetObject(OpenMode.ForRead))
 {

 foreach (ObjectId id in record)
 {
 Entity entity = (Entity)id.GetObject(OpenMode.ForRead, false, false); 
 CADTextModel model = new CADTextModel();
 switch (entity.GetRXClass().Name)
 { 
 case "AcDbText":
 Teigha.DatabaseServices.DBText text = (Teigha.DatabaseServices.DBText)entity;
 model.Location = ConverCADPointToRevitPoint(text.Position);
 model.Text = text.TextString;
 model.Angel = text.Rotation;
 model.Layer = text.Layer;
 listCADModels.Add(model);
 break;
 case "AcDbMText":
 Teigha.DatabaseServices.MText mText = (Teigha.DatabaseServices.MText)entity;
 model.Location = ConverCADPointToRevitPoint(mText.Location);
 model.Text = mText.Text;
 model.Angel = mText.Rotation;
 model.Layer = mText.Layer;
 listCADModels.Add(model);
 break;
 }
 }
 }
 }

 }
 }
 }
 }
 }
 return listCADModels;
 }

 /// <summary>
 /// 取得cad的图层名称
 /// </summary>
 /// <param name="dwgFile"></param>
 /// <returns></returns>
 public IList<string> GetLayerName(string dwgFile)
 {
 IList<string> cadLayerNames = new List<string>();
 using (new Services())
 {
 using (Database database = new Database(false, false))
 {
 database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
 using (var trans = database.TransactionManager.StartTransaction())
 {
 using (LayerTable lt = (LayerTable)trans.GetObject(database.LayerTableId, OpenMode.ForRead))
 {
 foreach (ObjectId id in lt)
 {
 LayerTableRecord ltr = (LayerTableRecord)trans.GetObject(id, OpenMode.ForRead);
 cadLayerNames.Add(ltr.Name);
 }
 }
 trans.Commit();
 }
 }
 } 
 return cadLayerNames;
 }

 /// <summary>
 /// 取得CAD里的线，包括直线、多段线、圆曲线
 /// </summary>
 /// <param name="dwgFile"></param>
 /// <returns></returns>
 public List<CADGeometryModel> GetCADCurves(string dwgFile)
 {
 List<CADGeometryModel> listCADModels = new List<CADGeometryModel>(); 
 using (new Services())
 {
 using (Database database = new Database(false, false))
 {
 database.ReadDwgFile(dwgFile, FileShare.Read, true, "");
 using (var trans = database.TransactionManager.StartTransaction())
 {
 using (BlockTable table = (BlockTable)database.BlockTableId.GetObject(OpenMode.ForRead))
 {
 using (SymbolTableEnumerator enumerator = table.GetEnumerator())
 {
 StringBuilder sb = new StringBuilder();
 while (enumerator.MoveNext())
 {
 using (BlockTableRecord record = (BlockTableRecord)enumerator.Current.GetObject(OpenMode.ForRead))
 {

 foreach (ObjectId id in record)
 {
 Entity entity = (Entity)id.GetObject(OpenMode.ForRead, false, false);
 CADGeometryModel geoModel = new CADGeometryModel();
 switch (entity.GetRXClass().Name)
 {
 case "AcDbPolyline":
 Teigha.DatabaseServices.Polyline pl = (Teigha.DatabaseServices.Polyline)entity;
 IList<XYZ> listPoints = new List<XYZ>();
 for (int i = 0; i < pl.NumberOfVertices; i++)
 {
 listPoints.Add(new XYZ(MillimetersToUnits(pl.GetPoint2dAt(i).X), MillimetersToUnits(pl.GetPoint2dAt(i).Y), 0));
 }
 PolyLine polyLine = PolyLine.Create(listPoints);
 listCADModels.Add(new CADGeometryModel() {CadPolyLine= polyLine,LayerName=pl.Layer });
 break;
 case "AcDbLine":
 Teigha.DatabaseServices.Line line = (Teigha.DatabaseServices.Line)entity;
 Autodesk.Revit.DB.Line revitLine = Autodesk.Revit.DB.Line.CreateBound(ConverCADPointToRevitPoint(line.StartPoint), ConverCADPointToRevitPoint(line.EndPoint));
 listCADModels.Add(new CADGeometryModel() {CadCurve=revitLine as Autodesk.Revit.DB.Curve ,LayerName=line.Layer});
 break;
 case "AcDbArc":
 Teigha.DatabaseServices.Arc arc = (Teigha.DatabaseServices.Arc)entity;
 double enda, stara;
 if (arc.StartAngle> arc.EndAngle)
 {
 enda = arc.StartAngle;
 stara = arc.EndAngle;
 }
 else
 {
 enda = arc.EndAngle;
 stara = arc.StartAngle;
 }
 Autodesk.Revit.DB.Arc revitArc = Autodesk.Revit.DB.Arc.Create(Autodesk.Revit.DB.Plane.CreateByNormalAndOrigin(new XYZ( arc.Normal.X, arc.Normal.Y, arc.Normal.Z),
 ConverCADPointToRevitPoint(arc.Center)), MillimetersToUnits(arc.Radius), stara, enda);
 listCADModels.Add(new CADGeometryModel() { CadCurve = revitArc as Autodesk.Revit.DB.Curve, LayerName = arc.Layer });
 break;
 default:
 break;
 }
 }
 }
 }

 }
 }
 }
 }
 }
 return listCADModels;
 }

 /// <summary>
 /// 毫米转化成英寸
 /// </summary>
 /// <param name="value"></param>
 /// <returns></returns>
 private double MillimetersToUnits(double value)
 {
 return UnitUtils.ConvertToInternalUnits(value, DisplayUnitType.DUT_MILLIMETERS);
 }

 /// <summary>
 /// 将CAD里的点转化为Revit里的点
 /// </summary>
 /// <param name="point"></param>
 /// <returns></returns>
 private XYZ ConverCADPointToRevitPoint(Point3d point)
 {
 return new XYZ(MillimetersToUnits(point.X), MillimetersToUnits(point.Y), MillimetersToUnits(point.Z));
 }
 }
}

需要额外引用一些dll文件。其中红色框框里的dll文件是需要加载进vs引用里的。其余的放在debug文件夹里。

结果如下，可以在Revit中正确读取cad的图层信息，文字位置，几何信息等：

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