C#通过Google Map获取给定地名的经纬度值

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 获取经纬度
{
    /// 
    /// 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);
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    using (StreamReader sr = new StreamReader(response.GetResponseStream()))
                    {
                        string[] tmpArray = sr.ReadToEnd().Split(',');
                        _latitude = tmpArray[2];
                        _longtitude = tmpArray[3];
                    }
                }
            }
            catch (System.Net.Sockets.SocketException ex)
            {
                Console.WriteLine("网络中断");
            }
            catch (Exception ex)
            {
                //throw ex;
                Console.WriteLine("异常类型：{0}", ex.GetType());
                Console.WriteLine("异常信息：{0}", ex.Message);
                Console.WriteLine("异常来源：{0}", ex.Source);
                Console.WriteLine("异常堆栈：{0}", ex.StackTrace);
                Console.WriteLine("内部异常：{0}", ex.InnerException);
            }
        }
 
        /// 
        /// get latitude
        /// 
        public string Latitude
        {
            get { return _latitude; }
            set { _latitude = value; }
        }
 
        /// 
        /// get longtitude
        /// 
        public string Longtitude
        {
            get { return _longtitude; }
            set { _longtitude = value; }
        }
    }
}