Utility/Weather.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
namespace Utility
{
   public class Weather
    {
        /// <summary>
        /// 获取今天气温，远程捕获
        /// </summary>
        /// <param name="strUrl"></param>
        /// <returns></returns>
        public static string GetWeatherToday()
        {
            string strUrl = System.Configuration.ConfigurationManager.AppSettings["Weather"].Trim();
            string WeatherToday = "";
           
                if (UrlExistsUsingSockets(strUrl))
                {
                    WebRequest wreq = WebRequest.Create(strUrl);
                    WebResponse wresp = (WebResponse)wreq.GetResponse();
                    Stream s = wresp.GetResponseStream();
                    StreamReader sr = new StreamReader(s, System.Text.Encoding.GetEncoding("utf-8"));
                    string HTML = sr.ReadToEnd();
                    int laststr = HTML.LastIndexOf("℃");
                    if (laststr > 0)
                    {
                        string Newhtml = HTML.Substring(0, laststr + 1);
                        int startstr = Newhtml.LastIndexOf(">");
                        int mylen = laststr - startstr;
                        WeatherToday = Newhtml.Substring(startstr + 1, mylen);
                    }
                    else
                    {
                        WeatherToday = "  天气预报解析不成功！";
                    }
                }
                else
                {
                    WeatherToday = "  获取天气预报失败！";
                }
            return WeatherToday;
        }

        /// <summary>
        /// 方法一、检测远程url是否存在
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        private static bool UrlExistsUsingHttpWebRequest(string url)
        {
            try
            {
                System.Net.HttpWebRequest myRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(url);
                myRequest.Method = "HEAD";
                myRequest.Timeout = 100;
                System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)myRequest.GetResponse();