MapObject shape数据操作 一

  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);
}
}
}