【转载】

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 = newWeatherWebService.WeatherWebService();

        /// <summary>

        /// 获取省

        /// </summary>

        private void FrmWeahter_Load(object sender, EventArgs e)

        {

            string[] proveces = weatherWebService.getSupportProvince();// 获取省

            foreach (string provece in proveces)

            {

                lbProvece.Items.Add(provece);

            }

        }

        /// <summary>

        /// 获取市

        /// </summary>

        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(' ')));

            }

        }

        /// <summary>

        /// 查询天气结果

        /// </summary>

        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

        }

    }

}