shapefile

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Data.Odbc;
using System.Data.OleDb;
using System.Collections;
using System.Data;
using System.Xml;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using DotNetARX;

namespace Readfile
{
    class Polygon
    {
        public ArrayList Parts = new ArrayList();
        public ArrayList Points = new ArrayList();
        public int NumPoints = 0;
    }
    class Point
    {
        public double X;
        public double Y;
    }
    public class ShapeFile
    {
        [CommandMethod("LoadShapefile")]
        public void LoadShapeFile()
        {
            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
            //加载shape file文件
            string filepath = @"C:\homework\shapefile\parcel2.shp";
            FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read);//文件流形式
            BinaryReader br = new BinaryReader(fs);//打开二进制文件
            br.ReadBytes(24);
            int FileLength = br.ReadInt32();
            //ed.WriteMessage("文件长度:" + ChangeByteOrder(FileLength));
            int FileBanben = br.ReadInt32();
            //ed.WriteMessage("文件长度:" + ChangeByteOrder(FileBanben));
            int ShapeType = br.ReadInt32();
            double xmin = br.ReadDouble();
            double ymin = br.ReadDouble();
            double xmax = br.ReadDouble();
            double ymax = br.ReadDouble();
            ed.WriteMessage("Xmin:" + xmin + "\n");
            ed.WriteMessage("Ymin:" + ymin + "\n");
            ed.WriteMessage("Xmax:" + xmax + "\n");
            ed.WriteMessage("Ymax:" + ymax + "\n");
            br.ReadBytes(40);
            Polygon polygon = new Polygon();//创建类面的新对象
            polygon.Parts = new ArrayList();
            polygon.Points = new ArrayList();
            polygon.NumPoints = br.ReadInt32();
            ed.WriteMessage("坐标点个数:" + polygon.NumPoints + "\n");
            double[] xpoints = new double[polygon.NumPoints];
            double[] ypoints = new double[polygon.NumPoints];
            br.ReadBytes(44);
            ed.WriteMessage("Points数组:" + "\n");
            for (int j = 0; j < polygon.NumPoints; j++)
            {
                Point pointtemp = new Point();
                xpoints[j]=pointtemp.X = br.ReadDouble();
                ypoints[j]=pointtemp.Y = br.ReadDouble();
                polygon.Points.Add(pointtemp);
                ed.WriteMessage("Points[" + j + "]:" + pointtemp.X + " " + pointtemp.Y + "\n");
            }
            ed.WriteMessage("--------------------------");
            //开始在cad中绘制图形
            ArrayList sz = polygon.Points;
            Database db = HostApplicationServices.WorkingDatabase;
            Polyline polyline = new Polyline();
            
            using (Transaction trans = db.TransactionManager.StartTransaction())
            {
                for (int i = 0; i < sz.Count; i++)
                {
                    polyline.AddVertexAt(i, new Point2d(xpoints[i],ypoints[i]), 0, 0, 0);
                }
                polyline.Closed = true;
                db.AddToModelSpace(polyline);
                trans.Commit();
            }
        }
    }
}