CAD二次开发(C#)：利用选择集获取标注尺寸

1.目的

本文的目的是利用C#中选择集GetSelection函数得到CAD中标注尺寸

2.实现代码

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoDrawingSF
{
    public class Drawing
    {
   
        [CommandMethod("AutoDrwing")]
        public void AutoDrwing()
        {

            Database db = HostApplicationServices.WorkingDatabase;
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            //保存图形信息到Excel文件
            string fileName = ed.OpenSaveDialog(db);
            if (fileName == "") return;

            TypedValue[] values = new TypedValue[]
            {   
                //设定为标注图元             
                new TypedValue((int)DxfCode.Start,"DIMENSION"),
                //new TypedValue((int)DxfCode.Start,"CIRCLE"),
            };
            //过滤标注图元
            SelectionFilter filter = new SelectionFilter(values);
            PromptSelectionResult psr = ed.GetSelection(filter);
            List<string> strX = new List<string>();
            List<string> strY = new List<string>();
            //List<ObjectId> ids = new List<ObjectId>();
            if (psr.Status == PromptStatus.OK)
            {
                SelectionSet sSet = psr.Value;
                ObjectId[] ids = sSet.GetObjectIds();
                //如果ids中没有数据则返回；
                if (ids.Length == 0) return;

                //开启事务处理
                using (Transaction trans = db.TransactionManager.StartTransaction())
                {
                    for (int i = 0; i < ids.Length; i++)
                    {
                        Entity ent = (Entity)ids[i].GetObject(OpenMode.ForRead);

                        //计算两个点X轴方向差值
                        double DistanceX = ((RotatedDimension)ent).XLine1Point.X - ((RotatedDimension)ent).XLine2Point.X;
                        //计算两个点Y轴方向差值
                        double DistanceY = ((RotatedDimension)ent).XLine1Point.Y - ((RotatedDimension)ent).XLine2Point.Y;
                        //判读尺寸是X轴方向还是Y轴方向，两点坐标X轴方向差值为0，此标注尺寸为Y轴方向，反之为X轴方向；
                        if (DistanceX == 0.0)
                        {
                            //获取标注尺寸长度，Y轴方向尺寸
                            double Distan = ((RotatedDimension)ent).XLine1Point.GetDistanceBetweenTwoPoint(((RotatedDimension)ent).XLine2Point);
                            strY.Add(Distan.ToString());
                        }
                        else if (DistanceY == 0)
                        {
                            //获取标注尺寸长度
                            double Distan = ((RotatedDimension)ent).XLine1Point.GetDistanceBetweenTwoPoint(((RotatedDimension)ent).XLine2Point);
                            strX.Add(Distan.ToString());
                        }
                    }
                    //关闭事务处理
                    trans.Commit();
                }
            }
           }
          }
         }

3.CAD常用图元类型

c#选择集中不仅能过滤标注图元，还能用来过滤直线(LIne),圆(circle),圆弧(Arc)等等，CAD中常见图元详见下图：

图元类型前面AcDb在实际 程序 开发中，不可添加到程序中；

4.其他相关资料 链接  

1）选择集Dxf规则
https://blog.csdn.net/weixin_42339460/article/details/80662972?ops_request_misc=&request_id=&biz_id=102&utm_term=CAD%E4%BA%8C%E6%AC%A1%E5%BC%80%E5%8F%91(.net)%E9%80%89%E6%8B%A9%E9%9B%86DXF&utm_medium=distribute.pc_search_result.none-task-blog-2_blogsobaiduweb~default-3-80662972.pc_v2_rank_blog_default&spm=1018.2226.3001.4450

   2）选择集讲解
https://blog.csdn.net/yzk1062913581/article/details/105537412?ops_request_misc=&request_id=&biz_id=102&utm_term=CAD%E4%BA%8C%E6%AC%A1%E5%BC%80%E5%8F%91(.net)%E9%80%89%E6%8B%A9%E9%9B%86&utm_medium=distribute.pc_search_result.none-task-blog-2_blogsobaiduweb~default-0-105537412.pc_v2_rank_blog_default&spm=1018.2226.3001.4450

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