Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Autodesk.AutoCAD.Interop;
using Autodesk.AutoCAD.Interop.Common;
using System.IO;

namespace 获取坐标
{
    public partial class Form1 : Form
    {
        AcadApplication AcadApp;
        AcadDocument AcadDoc;

        public Form1()
        {
            InitializeComponent();
        }

        private void 启动CAD()
        {
            try
            {
                AcadApp =
               (AcadApplication)System.Runtime.InteropServices.Marshal.GetActiveObject("AutoCAD.Application");
                AcadDoc = AcadApp.ActiveDocument;
            }
            catch
            {
                OpenFileDialog pOpenDG = new OpenFileDialog();
                pOpenDG.Filter = "CAD文件(*.dwg)|*.dwg|CAD图形文件(*.dxf)|*.dxf";
                pOpenDG.Title = "打开CAD文件";
                pOpenDG.ShowDialog();
                string filePath = pOpenDG.FileName;
                if (filePath == "")
                {
                    MessageBox.Show("选择CAD文件无效！", "文件无效！");
                    Application.Exit();
                }
                AcadApp = new AcadApplication();
                AcadDoc = AcadApp.Documents.Open(filePath, null, null);
            }
            AcadApp.Application.Visible = true;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //启动CAD();
        }

        private void GetLineCoords(AcadLine lineObj, out double[] coordsX, out double[] coordsY, out
double[] coordsZ, int arrayCount)
        {
            coordsX = new double[2 * arrayCount];