c# cad二次开发通过获取excel数据 在CAD绘图，将CAD属性导出到excel

c# cad二次开发通过获取excel数据 在CAD绘图，将CAD属性导出到excel
using Autodesk.AutoCAD.ApplicationServices;

using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Excel = NetOffice.ExcelApi;
using Autodesk.AutoCAD.DatabaseServices;
using System.IO;
using Autodesk.AutoCAD.Geometry;
namespace _17外部文件_Excel_交互
{
public class Class1
{
public struct CircleData
{
public double X;
public double Y;
public double Z;
public double R;
}

[CommandMethod(“ExcelDemo”)]
public void ExcelDemo()
{
Database db = HostApplicationServices.WorkingDatabase;
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
#region 保存图形信息到Excel文件
//string fileName = this.OpenSaveDialog(ed, db);
//if (fileName == “”) return;
////获取图形信息
//TypedValue[] values = new TypedValue[]
//{
// new TypedValue((int)DxfCode.Start,“circle”)
//};
//SelectionFilter filter = new SelectionFilter(values);
//PromptSelectionResult res = ed.SelectAll(filter);
//if (res.Status != PromptStatus.OK) return;

//ObjectId[] ids = res.Value.GetObjectIds();
//if (ids.Length == 0) return;
//CircleData[] datas = this.GetCircelData(db, ids);
////保存数据到Excel文件
//this.SaveDataToExcel(fileName, datas);
#endregion

#region 读取Excel文件画图

string file