MapObject shape数据操作

  利用MO 的GeoDataset  、DataConnection  Recordset 进行数据操作

 在MO中。使用GeoDataset对象和DataConnection 对象来连接和读取地理数据。

   GeoDataset： 是表达一个图层的地利数据的对象

 DatasetConnection对象指定一个和地理数据文件的连接，用Database 属性表示数据文件的地址。

Recordset 是Geodataset的记录集合或者查询后的数据集合

下面给一段 他们的使用  主要用于加载shp数据集并通过遍历获取线的每个节点

 

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using MapObjects2;



namespace mo

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        public MapObjects2.MapLayer AddShape(string basepath, string fileName, bool mHasMeasure)

        {

            DataConnection dCon = new DataConnection();

            GeoDataset gSet;

            mHasMeasure = false;



            dCon.Database = basepath;



            if (dCon.Connect())

            {

                gSet = dCon.FindGeoDataset(fileName);

                if (gSet == null)

                {

                    MessageBox.Show("打开shape文件异常");

                    return null;

                }

                else

                {

                    MapLayer newLayer = new MapLayer();

                    newLayer.GeoDataset = gSet;

                    mHasMeasure = gSet.HasMeasure;

                    dCon = null;

                    gSet = null;

                    MessageBox.Show(newLayer.Records.Count.ToString());

                    return newLayer;

                }

            }

            else

            {

                dCon = null;

                gSet = null;

                return null;

            }

        }



        private void Form1_Load(object sender, EventArgs e)

        {

           

           

        }

        //  h获取 图层中的每个节点 

        public void getLine(string mPath, string Name,bool fea)

        {

            Application.DoEvents();

            string txt = null;

            MapObjects2.MapLayer mLay;

            MapObjects2.Recordset mrec;

            Line mline = new Line();

            MapObjects2.Point mpt = new MapObjects2.Point(); ;

            mLay = AddShape(mPath, Name, false);

            mrec = mLay.Records;

            do

            {

                //从第一条数据开始处理

                //MessageBox.Show(mrec.Fields.Item("shape").);

                mline = mrec.Fields.Item("shape").Value ;

                MessageBox.Show(mline.Parts.Count.ToString());

               

                String mlxdm = mrec.Fields.Item("roadcode").Value.ToString();

                MessageBox.Show(mlxdm);

                if (mline.Parts.Count < 1)

                {

                    MessageBox.Show("line is nothing");

                    break;

                }

                for (int i = 0; i < mline.Parts.Count; i++)

                {

                    MapObjects2.Points   pt=   mline.Parts.Item(i) as MapObjects2.Points;



                    for (int j = 0; j < pt.Count;j++ )

                    {

                        richTextBox1.Text =  "x=" + pt.Item(j).X.ToString() + " y=" + pt.Item(j).Y.ToString() + " z=" + pt.Item(j).Z.ToString() + "\n" +richTextBox1.Text ;

                        //MessageBox.Show("x=" + pt.Item(i).X.ToString() + " y=" + pt.Item(i).Y.ToString() + " z=" + pt.Item(i).Z.ToString());

                        // MessageBox.Show( pt.ToString());

                    }

                  

                 

                   



                }

                mrec.MoveNext();

            } while (!mrec.EOF);

        }



        private void button1_Click(object sender, EventArgs e)

        {

            getLine(Application.StartupPath + "\\layerdata", "nmg_route", true);

        }

    }

}