AutoCAD2006+c#+ObjectArx简单纵横断面程序

    应老同学的要求，用C#+ObjectArx编了第一个程序，功能是根据测量的数据文件，测绘纵横断面图。
    纵断面数据示例：
1,0,3.9
2,10,3.87
3,20,3.86
4,21.5,2.4
5,40,2.42
    横断面数据示例：
0,3.9
5,3.92,10,3.97
5,3.93,10,3.98
20,3.86
5,3.85,10,3.85
5,3.86,10,3.84
40,2.42
5,2.41,10,2.43
5,2.43,10,2.44
花了一个晚上（找资料，熟悉ObjectArx，动手编起来倒挺快，就几行代码)
源代码如下：

using System ;
using System.IO;
using System.Text;
using Autodesk.AutoCAD.Runtime ;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Windows;
using Autodesk.AutoCAD.GraphicsInterface;
using Autodesk.AutoCAD.Colors;
using Autodesk.AutoCAD.PlottingServices;

[assembly: CommandClass(typeof(ClassLibrary.Road))]

namespace ClassLibrary
{
    /**//// <summary>
    /// Summary description for Class.
    /// </summary>
    public class Road
    {

        // Define Command "AsdkCmd1"
        [CommandMethod("Road")]
        static public void Help()
        {
            string s = "道路绘图程序\n程序设计：风\n命令列表\n横断面：Transect,纵断面：Vertical\n技术支持：http://xiexiaokui.cnblogs.com\nQQ:57164718";
            System.Windows.Forms.MessageBox.Show(s);
        }

        [CommandMethod("Vertical")]
        static public void Vertical()
        {
            string filename;
            Autodesk.AutoCAD.Windows.OpenFileDialog ofd = new OpenFileDialog("纵断面数据","","txt","打开纵断面数据",OpenFileDialog.OpenFileDialogFlags.AllowAnyExtension);
            if(ofd.ShowDialog()==System.Windows.Forms.DialogResult.OK)
            {
                filename = ofd.Filename;
            }
            else
            {
                return;
            }
            StreamReader sr = new StreamReader(filename);
            
            Transaction transaction=null;
            string data = sr.ReadLine();
            if(data==null)
                return;
            string[] datas = data.Split(',');
            int no = int.Parse(datas[0]);
            double x = double.Parse(datas[1]);
            double y = double.Parse(datas[2]);
            Point3d p1 = new Point3d(x,y,0);
            data = sr.ReadLine();
            while(data!=null)
            {
                if(data=="")
                    continue;
                datas = data.Split(',');
                no = int.Parse(datas[0]);
                x = double.Parse(datas[1]);
                y = double.Parse(datas[2]);
                Point3d p2 = new Point3d(x,y,0);
                Line line = new Line(p1,p2);

                transaction = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
                BlockTable bt = (BlockTable)transaction.GetObject(HostApplicationServices.WorkingDatabase.BlockTableId, OpenMode.ForRead);
                BlockTableRecord btr = transaction.GetObject(HostApplicationServices.WorkingDatabase.CurrentSpaceId,OpenMode.ForWrite) as BlockTableRecord;
                
                btr.AppendEntity(line);
                transaction.AddNewlyCreatedDBObject(line,true);
                transaction.Commit();

                p1 = p2;
                data = sr.ReadLine();
            }
        }

    
        // Define Command "AsdkCmd1"
        [CommandMethod("Transect")]
        static public void Transect() // This method can have any name
        {
            string filename;
            Autodesk.AutoCAD.Windows.OpenFileDialog ofd = new OpenFileDialog("纵断面数据","","txt","打开纵断面数据",OpenFileDialog.OpenFileDialogFlags.AllowAnyExtension);
            if(ofd.ShowDialog()==System.Windows.Forms.DialogResult.OK)
            {
                filename = ofd.Filename;
            }
            else
            {
                return;
            }
            StreamReader sr = new StreamReader(filename);
            
            double baseHeight = 0;    
            string data = sr.ReadLine();
            Transaction transaction=null;
            while(data!=null)
            {
                if(data=="")
                    continue;
                string[] datas = data.Split(',');
                int no = int.Parse(datas[0]);
                double stake = double.Parse(datas[1]);
                string left = sr.ReadLine();
                string right = sr.ReadLine();
                string[] lefts = left.Split(',');
                string[] rights = right.Split(',');

                Point3d center = new Point3d(0,baseHeight,0);
                Point3d lp1 = new Point3d(-double.Parse(lefts[0]),double.Parse(lefts[1])+baseHeight,0);
                Point3d lp2 = new Point3d(-double.Parse(lefts[2]),double.Parse(lefts[3])+baseHeight,0);
                Point3d rp1 = new Point3d(double.Parse(rights[0]),double.Parse(rights[1])+baseHeight,0);
                Point3d rp2 = new Point3d(double.Parse(rights[2]),double.Parse(rights[3])+baseHeight,0);

                Line l1 = new Line(center,lp1);
                Line r1 = new Line(center,rp1);
                Line r2 = new Line(rp1,rp2);
                Line l2 = new Line(lp1,lp2);
                
                transaction = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
                BlockTable bt = (BlockTable)transaction.GetObject(HostApplicationServices.WorkingDatabase.BlockTableId, OpenMode.ForRead);
                BlockTableRecord btr = transaction.GetObject(HostApplicationServices.WorkingDatabase.CurrentSpaceId,OpenMode.ForWrite) as BlockTableRecord;
                
                btr.AppendEntity(l1);
                transaction.AddNewlyCreatedDBObject(l1,true);
                transaction.Commit();
                
                transaction = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
                bt = (BlockTable)transaction.GetObject(HostApplicationServices.WorkingDatabase.BlockTableId, OpenMode.ForRead);
                btr = transaction.GetObject(HostApplicationServices.WorkingDatabase.CurrentSpaceId,OpenMode.ForWrite) as BlockTableRecord;
                
                btr.AppendEntity(l2);
                transaction.AddNewlyCreatedDBObject(l2,true);
                transaction.Commit();

                transaction = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
                bt = (BlockTable)transaction.GetObject(HostApplicationServices.WorkingDatabase.BlockTableId, OpenMode.ForRead);
                btr = transaction.GetObject(HostApplicationServices.WorkingDatabase.CurrentSpaceId,OpenMode.ForWrite) as BlockTableRecord;

                btr.AppendEntity(r1);
                transaction.AddNewlyCreatedDBObject(r1,true);
                transaction.Commit();
                

                transaction = HostApplicationServices.WorkingDatabase.TransactionManager.StartTransaction();
                bt = (BlockTable)transaction.GetObject(HostApplicationServices.WorkingDatabase.BlockTableId, OpenMode.ForRead);
                btr = transaction.GetObject(HostApplicationServices.WorkingDatabase.CurrentSpaceId,OpenMode.ForWrite) as BlockTableRecord;

                btr.AppendEntity(r2);
                transaction.AddNewlyCreatedDBObject(r2,true);
                transaction.Commit();

                baseHeight += 10;
                data = sr.ReadLine();

            }
        }
    }
}