c# 实现天气预报

先添加Web引用http://www.webxml.com.cn/WebServices/WeatherWebService.asmx

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;

namespace WindowsFormsApplication1
{
    public partial class FrmWeahter : Form
    {
        public FrmWeahter()
        {
            InitializeComponent();
        }

        //实例化天气预报服务
        WeatherWebService.WeatherWebService weatherWebService = new WeatherWebService.WeatherWebService();

        ///
        /// 获取省
        ///
        private void FrmWeahter_Load(object sender, EventArgs e)
        {
            string[] proveces = weatherWebService.getSupportProvince();// 获取省
            foreach (string provece in proveces)
            {
                lbProvece.Items.Add(provece);
            }
        }

        ///
        /// 获取市
        ///
        private void lbProvece_SelectedIndexChanged(object sender, EventArgs e)
        {
            lbCity.Items.Clear();
            string[] citys = weatherWebService.getSupportCity(lbProvece.SelectedItem.ToString());//获取市
            foreach (string city in citys)
            {
                lbCity.Items.Add(city.Substring(0, city.IndexOf(' ')));
            }
        }

        ///
        /// 查询天气结果
        ///
        private void lbCity_SelectedIndexChanged(object sender, EventArgs e)
        {
            txtWeather.Clear();
            string[] weathers = weatherWebService.getWeatherbyCityName(lbCity.SelectedItem.ToString());// 获取天气
            if (weathers[1].Trim() == "")
            {
                MessageBox.Show("操作太快");
                return;
            }
            //获取所有返回信息
            for (int i = 0; i < weathers.Length; i++)
            {
                txtWeather.Text += weathers[i] + "        " + i.ToString() + "\r\n\r\n";
            }
            string path = Application.StartupPath + @"\weather\";
            pictureBox1.Image = new Bitmap(path + weathers[8]);//天气趋势开始图片
            pictureBox2.Image = new Bitmap(path + weathers[9]);//天气趋势结束图片
            lblTemp.Text = weathers[5];//气温
            lblCity.Text = lbCity.SelectedItem.ToString();//城市
        }
    }
}

气图标可至【http://www.webxml.com.cn/images/weather.zip】下载。