C#读取shapefile文件

C#读取shapefile文件（不用AE）

1.创建工程文件，选窗体应用程序，命名为：EsriShpReader

2.添加SplitContainer控件到窗体

3.在SplitContainer.panel1中添加两个按钮Button，text属性分别改为“打开”，“刷新”

4. 在SplitContainer.panel2中添加panel容器，用来显示图像

Dock设置为Fill，背景颜色设置为白色

5.界面图如下：

6.在过程文件中添加类文件，命名为ShpClass

编写点、线、面、三个类

class Point//点类

{

public double X;

public double Y;

}

class Polyline//线类

{

public double[] Box=new double[4];

public int NumParts;

public int NumPoints;

public ArrayList Parts; //在部分中第一个点的索引

public ArrayList Points; //所有部分的点

}

class Polygon : Polyline//面类

{ }

7.在Form1中添加

ArrayList polygons = new ArrayList();//面集合

ArrayList polylines = new ArrayList();//线集合

ArrayList points = new ArrayList();//点集合

Pen pen = new Pen(Color.Black, 1);//定义画笔

int ShapeType;//shp文件类型

int count;//计数

double xmin, ymin, xmax, ymax;

double n1, n2;//x，y轴放大倍数

8.添加button1的Click事件，添加代码

string shpfilepath = "";

openFileDialog1.Filter = "shapefiles(*.shp)|*.shp|All files(*.*)|*.*";//打开文件路径if (openFileDialog1.ShowDialog() == DialogResult.OK)

{

shpfilepath = openFileDialog1.FileName;

BinaryReader br = new BinaryReader(openFileDialog1.OpenFile());

//读取文件过程

br.ReadBytes(24);

int FileLength = br.ReadInt32();//<0代表数据长度未知

int FileBanben = br.ReadInt32();

ShapeType = br.ReadInt32();

xmin = br.ReadDouble();

ymax = -1 * br.ReadDouble();

xmax = br.ReadDouble();

ymin = -1 * br.ReadDouble();

double width = xmax - xmin;

double height = ymax - ymin;

n1 = (float)(this.panel1.Width * 0.9 / width);//x轴放大倍数

n2 = (float)(this.panel1.Height * 0.9 / height);//y轴放大倍数

br.ReadBytes(32);

switch (ShapeType)

{

case 1:

points.Clear();

while (br.PeekChar() != -1)

{

Point point = new Point();

uint RecordNum = br.ReadUInt32();

int DataLength = br.ReadInt32();

//读取第i个记录

br.ReadInt32();

point.X = br.ReadDouble();

point.Y = -1 * br.ReadDouble();

points.Add(point);

}

StreamWriter sw = new StreamWriter("point.txt");

foreach (Point p in points)

{

sw.WriteLine("{0},{1},{2} ", p.X, -1 * p.Y, 0);

}

sw.Close();

break;

case 3:

polylines.Clear();

while (br.PeekChar() != -1)

{

Polyline polyline = new Polyline();

polyline.Box = new double[4];

polyline.Parts = new ArrayList();

polyline.Points = new ArrayList();

uint RecordNum = br.ReadUInt32();

int DataLength = br.ReadInt32();

//读取第i个记录

br.ReadInt32();

polyline.Box[0] = br.ReadDouble();

polyline.Box[1] = br.ReadDouble();

polyline.Box[2] = br.ReadDouble();

polyline.Box[3] = br.ReadDouble();

polyline.NumParts = br.ReadInt32();

polyline.NumPoints = br.ReadInt32();

for (int i = 0; i < polyline.NumParts; i++) {

int parts = new int();

parts = br.ReadInt32();

polyline.Parts.Add(parts);

}

for (int j = 0; j < polyline.NumPoints; j++)

{

Point pointtemp = new Point();

pointtemp.X = br.ReadDouble();

pointtemp.Y = -1 * br.ReadDouble();

polyline.Points.Add(pointtemp);

}