by shinichi_wtn
2010-01-14 16:24
参考了网上部分资料，自己改写了一个方便的获取经纬度信息的类Geo，其中Latitude和Longtitude分别是纬度和经度。其中最重要的构造函数就是传入地名，通过Webrequest从Google Map获得经纬度值，在含有地理位置信息的项目里可以很方便的调用，即Geo g = new Geo("北京师范大学");然后g.Latitude和g.Longtitude就是北京师范大学的纬度和经度了，它们分别是39.9614580，116.3692820。Geo的实现如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
namespace YourNameSpace
{
///
/// a class for latitude and longtitude
///
[Serializable]
public class Geo
{
///
/// latitude
///
private string _latitude = "";
///
/// longtitude
///
private string _longtitude = "";
///
/// default constructor
///
public Geo()
{
}
///
/// construct geo given latitude and longtitude
///
public Geo(string latitude, string longtitude)
{
_latitude = latitude;
_longtitude = longtitude;
}
///
/// construct geo given name of a place
///
public Geo(string location)
{
string output = "csv";
string url = string.Format("http://maps.google.com/maps/geo?q={0}&output={1}", location, output);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (StreamReader sr = new StreamReader(response.GetResponseStream()))
{
string[] tmpArray = sr.ReadToEnd().Split(',');
_latitude = tmpArray[2];
_longtitude = tmpArray[3];
}
}
///
/// get latitude
///
public string Latitude
{
get { return _latitude; }
set { _latitude = value; }
}
///
/// get longtitude
///
public string Longtitude
{
get { return _longtitude; }
set { _longtitude = value; }
}
}
}