所以我们要添加web引用共两个

1.根据IP地址获取你所在城市（假如没有这个，而直接引用相关网站提供的webservice，你所在的地点可能不是很准确，假如，你用了路由器....等，不知道大家是有同感）

2.根据上一部获取的城市，调用获取天气数据的webservice

贴取部分代码：


	复制代码 代码如下:

	

	using System;

	using System.Collections.Generic;

	using System.ComponentModel;

	using System.Data;

	using System.Drawing;

	using System.Text;

	using System.Windows.Forms;

	using System.ServiceModel;

	using System.Runtime.InteropServices;

	namespace MyWeather

	{

	public partial class Form1 : Form

	{

	string myip,mycity;

	private double opacity = 0;//记录当前窗体的透明度

	//实现无边框移动

	[DllImport("user32.dll")]

	public static extern bool ReleaseCapture();

	[DllImport("user32.dll")]

	public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

	public const int WM_SYSCOMMAND = 0x0112;

	public const int SC_MOVE = 0xF010;

	public const int HTCAPTION = 0x0002;

	//实现无边框移动

	public Form1()

	{

	InitializeComponent();

	}

	private void Form1_Load(object sender, EventArgs e)

	{

	Opacity = 0;//指定窗体完全透明

	GetIP();

	GetCityByIP(myip);

	DisplayWeather();

	}

	protected void GetIP()

	{

	try

	{

	string strUrl = "http://www.ip138.com/ip2city.asp"; //获得IP的网址

	Uri uri = new Uri(strUrl);

	System.Net.WebRequest wr = System.Net.WebRequest.Create(uri);

	System.IO.Stream s = wr.GetResponse().GetResponseStream();

	System.IO.StreamReader sr = new System.IO.StreamReader(s, Encoding.Default);

	string all = sr.ReadToEnd(); //读取网站的数据

	int i = all.IndexOf("[") + 1;

	string tempip = all.Substring(i, 15);

	string ip = tempip.Replace("]", "").Replace(" ", "");//找出i

	myip = ip;

	}

	catch (Exception e)

	{

	Console.WriteLine(e.ToString());

	}

	}

	protected void GetCityByIP(string myip)

	{

	IPCity.IpAddressSearchWebService city = new IPCity.IpAddressSearchWebService();

	string[] ss = city.getCountryCityByIp(myip);

	int n = ss[1].IndexOf(' ');//空格所在位置

	int m = ss[1].IndexOf('省');//ss[1]的实际内容是XX省 XX市，而获取天气的webservice只需要知道是某个市不需要知道省，所以截取了XX市

	int x = n - m;

	mycity = ss[1].Substring(m+1,x-2);

	}

	protected void DisplayWeather()

	{

	webxml.WeatherWebService w = new webxml.WeatherWebService();

	//把webservice当做一个类来操作

	string[] s = new string[23];//声明string数组存放返回结果

	s = w.getWeatherbyCityName(mycity);

	if (s[8] == "")

	{

	MessageBox.Show("暂时不支持您查询的城市");

	}

	else

	{

	string png = s[8].Substring(0, s[8].Length - 4);

	string png2 = s[15].Substring(0, s[15].Length - 4);

	string png3 = s[20].Substring(0, s[20].Length - 4);

	string path = Application.StartupPath;

	pictoday.Image = Image.FromFile(path+"\\images\\"+png+".png");

	pic1.Image = Image.FromFile(path + "\\images\\" + png + ".png");

	pic2.Image = Image.FromFile(path + "\\images\\" + png2 + ".png");

	pic3.Image = Image.FromFile(path + "\\images\\" + png3 + ".png");

	this.lbl1.Text = s[5].ToString();

	this.lbl2.Text = s[12].ToString();

	this.lbl3.Text = s[17].ToString();

	this.time.Text = s[4].ToString();

	this.address.Text = s[1].ToString();

	this.temperature.Text = s[5].ToString();

	this.label4.Text = s[6].Substring(s[6].IndexOf('日')+1).ToString();

	this.label5.Text = s[7].ToString();

	this.tempo1.Text = s[6].Substring(s[6].IndexOf('日')+1);

	this.tempo2.Text = s[13].Substring(s[13].IndexOf('日')+1);

	this.tempo3.Text = s[18].Substring(s[18].IndexOf('日')+1);

	}

	}

	//实现无边框移动

	private void Form1_MouseDown(object sender, MouseEventArgs e)

	{

	ReleaseCapture();

	SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

	}

	private void timer1_Tick(object sender, EventArgs e)

	{

	if (opacity <= 1)

	{

	opacity = opacity + 0.05;

	Opacity = opacity;

	}

	}

	}

	}