在Revit中读取、隐藏并绘制CAD线

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB.Structure;

namespace 遍历CAD上所有类型的线段
{
    [Transaction(TransactionMode.Manual)]
    public class Class1 : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            UIDocument uidoc = commandData.Application.ActiveUIDocument;
            Document doc = uidoc.Document;//获取活动文档

            Selection sel = uidoc.Selection;
            Reference re = sel.PickObject(ObjectType.PointOnElement);//获取到CAD上的reference
            ImportInstance dwg = doc.GetElement(re) as ImportInstance;//cad引用转换为导入实例



            //创建几何选项
            Options opt = new Options();
            opt.ComputeReferences = true;
            //Options.ComputeReferences必须为true，否是拿到的几何体的Reference都将是null
            opt.DetailLevel = ViewDetailLevel.Fine;

            GeometryElement e = dwg.get_Geometry(opt);


            //获取CAD上的线并生成模型线
            Transaction trans = new Transaction(doc, "创建模型线");
            trans.Start();

            //隐藏CAD
            var geoObj = (dwg as Element).GetGeometryObjectFromReference(re);//获取几何对象
            ElementId ElId = null;
            GraphicsStyle _graphicsStyle = doc.GetElement(geoObj.GraphicsStyleId) as GraphicsStyle;//获取图形类型
            ElId = _graphicsStyle.GraphicsStyleCategory.Id;//获取图形类别的ID
            doc.ActiveView.SetCategoryHidden(ElId, true);//设置类别隐藏

            foreach (GeometryObject obj in e)
            {
                if (obj is GeometryInstance)//对象是geometryinstance
                {
                    GeometryInstance geoInstance = obj as GeometryInstance;

                    GeometryElement geoElement = geoInstance.GetInstanceGeometry();
                    foreach (GeometryObject obj2 in geoElement)
                    {
                        ElementId obj2Id = (doc.GetElement(obj2.GraphicsStyleId) as GraphicsStyle).GraphicsStyleCategory.Id;//获取图形类别ID
                        if (obj2Id == ElId)//判断选择类别ID和图层ID是否匹配
                        {
                            List xyzList = new List();
                            if (obj2 is PolyLine)
                            {
                                PolyLine pLine = obj2 as PolyLine;
                                foreach (XYZ p in pLine.GetCoordinates())
                                {
                                    xyzList.Add(p);
                                }
                                CreatModelCurve(doc, xyzList);
                            }
                            if (obj2 is Arc)
                            {

                            }
                            if (obj2 is Line)
                            {
                                Line line = obj2 as Line;
                                foreach (XYZ p in line.Tessellate())
                                {
                                    xyzList.Add(p);
                                }
                                CreatModelCurve(doc, xyzList);

                            }
                        }

                    }
                }
            }

            trans.Commit();





            return Result.Succeeded;
        }

        /// 

        /// 
        /// 
        /// 文档
        /// 传入点列表
        private void CreatModelCurve(Document doc, List xyzList)
        {
            SketchPlane modelSketch = SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(XYZ.BasisZ, XYZ.Zero));
            for (int i = 0; i < xyzList.Count; i++)
            {
                if (i >= 1)
                {
                    Line line = Line.CreateBound(xyzList[i], xyzList[i - 1]);
                    ModelCurve modelLine = doc.Create.NewModelCurve(line, modelSketch);
                }
            }
        }
    }
}

这里要感谢一下CSDN niuge8905版主 https://blog.csdn.net/niuge8905/article/details/77160646  和 JohnnyWu0918 https://me.csdn.net/mye918 从他们的文章中找到了读取CAD线段的一些方法。