解析网页中添加新浪天气预报的几种方法(2)_.Net教程

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代码如下： 
using System;
using System.Collections.Generic;
using System.Web;

namespace WebApplication8
{
    public class ConvertCode
    {
        public static string ConvertCodeByCity(string City)
        {
            string Code = "";
            switch (City)
            {
                case "北京":
                    Code = "110100";
                    break;
                case "天津":
                    Code = "120100";
                    break;
                case "石家庄":
                    Code = "130101";
                    break;
                case "唐山":
                    Code = "130201";
                    break;
                case "秦皇岛":
                    Code = "130301";
                    break;
                case "张家口":
                    Code = "130701";
                    break;
                case "承德":
                    Code = "130801";
                    break;
                case "廊坊":
                    Code = "131001";
                    break;
                case "邯郸":
                    Code = "130401";
                    break;
                case "邢台":
                    Code = "130501";
                    break;
                case "保定":
                    Code = "130601";
                    break;
                case "沧州":
                    Code = "130901";
                    break;
                case "衡水":
                    Code = "133001";
                    break;
                case "太原":
                    Code = "140101";
                    break;
                case "大同":
                    Code = "140201";
                    break;
                case "阳泉":
                    Code = "140301";
                    break;
                case "晋城":
                    Code = "140501";
                    break;
                case "朔州":
                    Code = "140601";
                    break;
                case "忻州":
                    Code = "142201";
                    break;
                case "离石":
                    Code = "142331";
                    break;
                case "榆次":
                    Code = "142401";
                    break;
                case "临汾":
                    Code = "142601";
                    break;
                case "运城":
                    Code = "142701";
                    break;
                case "长治":
                    Code = "140401";
                    break;
                case "呼和浩特":
                    Code = "150101";
                    break;
                case "包头":
                    Code = "150201";
                    break;
                case "乌海":
                    Code = "150301";
                    break;
                case "集宁":
                    Code = "152601";
                    break;
                case "巴彦浩特":                           //这个城市搜索不到
                    Code = "152701";
                    break;
                case "临河":
                    Code = "152801";
                    break;
                case "鄂尔多斯":                           //这个城市搜索不到
                    Code = "152921";
                    break;
                case "赤峰":
                    Code = "150401";
                    break;
                case "通辽":
                    Code = "152301";
                    break;
                case "锡林浩特":
                    Code = "152502";
                    break;
                case "海拉尔":                            //这个城市搜索不到
                    Code = "152101";
                    break;
                case "乌兰浩特":
                    Code = "152201";
                    break;
                case "沈阳":
                    Code = "210101";
                    break;
                case "大连":
                    Code = "210201";
                    break;
                case "鞍山":
                    Code = "210301";
                    break;
                case "抚顺":
                    Code = "210401";
                    break;
                case "本溪":
                    Code = "210501";
                    break;
                case "锦州":
                    Code = "210701";
                    break;
                case "营口":
                    Code = "210801";
                    break;
                case "阜新":
                    Code = "210901";
                    break;
                case "盘锦":
                    Code = "211101";
                    break;
                case "铁岭":
                    Code = "211201";
                    break;
                case "朝阳":
                    Code = "211301";
                    break;
                case "葫芦岛":
                    Code = "211401";
                    break;
                case "丹东":
                    Code = "210601";
                    break;
                case "长春":
                    Code = "220101";
                    break;
                case "吉林":
                    Code = "220201";
                    break;
                case "四平":
                    Code = "220301";
                    break;
                case "辽源":
                    Code = "220401";
                    break;
                case "松原":
                    Code = "220601";
                    break;
                case "白城":
                    Code = "222301";
                    break;
                case "延边":
                    Code = "222401";
                    break;
                case "通化":
                    Code = "220501";
                    break;
                case "哈尔滨":
                    Code = "230101";
                    break;
                case "鸡西":
                    Code = "230301";
                    break;
                case "鹤岗":
                    Code = "230401";
                    break;
                case "双鸭山":
                    Code = "230501";
                    break;
                case "伊春":
                    Code = "230701";
                    break;
                case "佳木斯":
                    Code = "230801";
                    break;
                case "七台河":
                    Code = "230901";
                    break;
                case "牡丹江":
                    Code = "231001";
                    break;
                case "绥化":
                    Code = "232301";
                    break;
                case "齐齐哈尔":
                    Code = "230201";
                    break;
                case "大庆":
                    Code = "230601";
                    break;
                case "黑河":
                    Code = "232601";
                    break;
                case "大兴安岭":
                    Code = "232700";
                    break;
                case "上海":
                    Code = "310100";
                    break;
                case "南京":
                    Code = "320101";
                    break;
                case "无锡":
                    Code = "320201";
                    break;
                case "徐州":
                    Code = "320301";
                    break;
                case "常州":
                    Code = "320401";
                    break;
                case "苏州":
                    Code = "320501";
                    break;
                case "南通":
                    Code = "320600";
                    break;
                case "连云港":
                    Code = "320701";
                    break;
                case "淮阴":
                    Code = "320801";
                    break;
                case "盐城":
                    Code = "320901";
                    break;
                case "扬州":
                    Code = "321001";
                    break;
                case "镇江":
                    Code = "321101";
                    break;
                case "泰州":
                    Code = "321102";
                    break;
                case "宿迁":
                    Code = "321103";
                    break;
                case "杭州":
                    Code = "330101";
                    break;
                case "宁波":
                    Code = "330201";
                    break;
                case "温州":
                    Code = "330301";
                    break;
                case "嘉兴":
                    Code = "330401";
                    break;
                case "湖州":
                    Code = "330501";
                    break;
                case "绍兴":
                    Code = "330601";
                    break;
                case "金华":
                    Code = "330701";
                    break;
                case "衢州":
                    Code = "330801";
                    break;
                case "舟山":
                    Code = "330901";
                    break;
                case "丽水":
                    Code = "332501";
                    break;
                case "台州":
                    Code = "332602";
                    break;
                case "合肥":
                    Code = "340101";
                    break;
                case "芜湖":
                    Code = "340201";
                    break;
                case "蚌埠":
                    Code = "340301";
                    break;
                case "淮南":
                    Code = "340401";
                    break;
                case "马鞍山":
                    Code = "340501";
                    break;
                case "淮北":
                    Code = "340601";
                    break;
                case "铜陵":
                    Code = "340701";
                    break;
                case "安庆":
                    Code = "340801";
                    break;
                case "黄山市":
                    Code = "341001";
                    break;
                case "阜阳":
                    Code = "342101";
                    break;
                case "宿州":
                    Code = "342201";
                    break;
                case "滁州":
                    Code = "342301";
                    break;
                case "六安":
                    Code = "342401";
                    break;
                case "宣城":
                    Code = "342501";
                    break;
                case "巢湖":
                    Code = "342601";
                    break;
                case "池州":
                    Code = "342901";
                    break;
                case "福州":
                    Code = "350101";
                    break;
                case "厦门":
                    Code = "350201";
                    break;
                case "莆田":
                    Code = "350301";
                    break;
                case "三明":
                    Code = "350401";
                    break;
                case "泉州":
                    Code = "350501";
                    break;
                case "漳州":
                    Code = "350601";
                    break;
                case "南平":
                    Code = "352101";
                    break;
                case "宁德":
                    Code = "352201";
                    break;
                case "龙岩":
                    Code = "352601";
                    break;
                case "陇南":
                    Code = "352602";
                    break;
                case "庆阳":
                    Code = "352603";
                    break;
                case "南昌":
                    Code = "360101";
                    break;
                case "景德镇":
                    Code = "360201";
                    break;
                case "赣州":
                    Code = "362101";
                    break;
                case "萍乡":
                    Code = "360301";
                    break;
                case "九江":
                    Code = "360401";
                    break;
                case "新余":
                    Code = "360501";
                    break;
                case "鹰潭":
                    Code = "360601";
                    break;
                case "宜春":
                    Code = "362201";
                    break;
                case "上饶":
                    Code = "362301";
                    break;
                case "吉安":
                    Code = "362401";
                    break;
                case "济南":
                    Code = "370101";
                    break;
                case "青岛":
                    Code = "370201";
                    break;
                case "淄博":
                    Code = "370301";
                    break;
                case "枣庄":
                    Code = "370401";
                    break;
                case "东营":
                    Code = "370501";
                    break;
                case "烟台":
                    Code = "370601";
                    break;
                case "潍坊":
                    Code = "370701";
                    break;
                case "济宁":
                    Code = "370801";
                    break;
                case "泰安":
                    Code = "370901";
                    break;
                case "威海":
                    Code = "371001";
                    break;
                case "日照":
                    Code = "371100";
                    break;
                case "滨州":
                    Code = "372301";
                    break;
                case "德州":
                    Code = "372401";
                    break;
                case "聊城":
                    Code = "372501";
                    break;
                case "临沂":
                    Code = "372801";
                    break;
                case "菏泽":
                    Code = "372901";
                    break;
                case "莱芜":
                    Code = "372902";
                    break;
                case "郑州":
                    Code = "410101";
                    break;
                case "开封":
                    Code = "410201";
                    break;
                case "洛阳":
                    Code = "410301";
                    break;
                case "平顶山":
                    Code = "410401";
                    break;
                case "安阳":
                    Code = "410501";
                    break;
                case "鹤壁":
                    Code = "410601";
                    break;
                case "新乡":
                    Code = "410701";
                    break;
                case "焦作":
                    Code = "410801";
                    break;
                case "濮阳":
                    Code = "410901";
                    break;
                case "许昌":
                    Code = "411001";
                    break;
                case "漯河":
                    Code = "411101";
                    break;
                case "三门峡":
                    Code = "411201";
                    break;
                case "商丘":
                    Code = "412301";
                    break;
                case "周口":
                    Code = "412701";
                    break;
                case "驻马店":
                    Code = "412801";
                    break;
                case "南阳":
                    Code = "412901";
                    break;
                case "信阳":
                    Code = "413001";
                    break;
                case "武汉":
                    Code = "420101";
                    break;
                case "黄石":
                    Code = "420201";
                    break;
                case "十堰":
                    Code = "420301";
                    break;
                case "随州":
                    Code = "420400";
                    break;
                case "宜昌":
                    Code = "420501";
                    break;
                case "襄樊":
                    Code = "420601";
                    break;
                case "鄂州":
                    Code = "420701";
                    break;
                case "荆门":
                    Code = "420801";
                    break;
                case "黄冈":
                    Code = "422103";
                    break;
                case "孝感":
                    Code = "422201";
                    break;
                case "咸宁":
                    Code = "422301";
                    break;
                case "荆州":
                    Code = "422421";
                    break;
                case "恩施":
                    Code = "422801";
                    break;
                case "长沙":
                    Code = "430101";
                    break;
                case "衡阳":
                    Code = "430401";
                    break;
                case "邵阳":
                    Code = "430501";
                    break;
                case "郴州":
                    Code = "432801";
                    break;
                case "永州":
                    Code = "432901";
                    break;
                case "韶山":
                    Code = "430801";
                    break;
                case "张家界":
                    Code = "430802";
                    break;
                case "怀化":
                    Code = "433001";
                    break;
                case "吉首":
                    Code = "433101";
                    break;
                case "株洲":
                    Code = "430201";
                    break;
                case "湘潭":
                    Code = "430301";
                    break;
                case "岳阳":
                    Code = "430601";
                    break;
                case "常德":
                    Code = "430701";
                    break;
                case "益阳":
                    Code = "432301";
                    break;
                case "娄底":
                    Code = "432501";
                    break;
                case "广州":
                    Code = "440101";
                    break;
                case "佛山":
                    Code = "440601";
                    break;
                case "深圳":
                    Code = "440301";
                    break;
                case "汕尾":
                    Code = "441501";
                    break;
                case "惠州":
                    Code = "441301";
                    break;
                case "河源":
                    Code = "441601";
                    break;
                case "清远":
                    Code = "441801";
                    break;
                case "东莞":
                    Code = "441901";
                    break;
                case "珠海":
                    Code = "440401";
                    break;
                case "江门":
                    Code = "440701";
                    break;
                case "肇庆":
                    Code = "441201";
                    break;
                case "中山":
                    Code = "442001";
                    break;
                case "湛江":
                    Code = "440801";
                    break;
                case "茂名":
                    Code = "440901";
                    break;
                case "韶关":
                    Code = "440201";
                    break;
                case "汕头":
                    Code = "440501";
                    break;
                case "梅州":
                    Code = "441401";
                    break;
                case "阳江":
                    Code = "441701";
                    break;
                case "潮州":
                    Code = "441702";
                    break;
                case "顺德":
                    Code = "441703";
                    break;
                case "揭阳":
                    Code = "441704";
                    break;
                case "云浮":
                    Code = "441705";
                    break;
                case "南宁":
                    Code = "450101";
                    break;
                case "梧州":
                    Code = "450401";
                    break;
                case "玉林":
                    Code = "452501";
                    break;
                case "桂林":
                    Code = "450301";
                    break;
                case "百色":
                    Code = "452601";
                    break;
                case "河池":
                    Code = "452701";
                    break;
                case "钦州":
                    Code = "452802";
                    break;
                case "柳州":
                    Code = "450201";
                    break;
                case "北海":
                    Code = "450501";
                    break;
                case "防城港":
                    Code = "450502";
                    break;
                case "贵港":
                    Code = "450503";
                    break;
                case "贺州":
                    Code = "450504";
                    break;
                case "海口":
                    Code = "460100";
                    break;
                case "三亚":
                    Code = "460200";
                    break;
                case "西沙群岛":
                    Code = "460300";
                    break;
                case "成都":
                    Code = "510101";
                    break;
                case "眉山":
                    Code = "513321";
                    break;
                case "雅安":
                    Code = "513101";
                    break;
                case "峨嵋山":
                    Code = "513229";
                    break;
                case "自贡":
                    Code = "510301";
                    break;
                case "重庆":
                    Code = "500100";
                    break;
                case "万州":
                    Code = "500102";
                    break;
                case "涪陵":
                    Code = "500103";
                    break;
                case "南充":
                    Code = "512901";
                    break;
                case "泸州":
                    Code = "510501";
                    break;
                case "德阳":
                    Code = "510601";
                    break;
                case "绵阳":
                    Code = "510701";
                    break;
                case "遂宁":
                    Code = "510901";
                    break;
                case "内江":
                    Code = "511001";
                    break;
                case "乐山":
                    Code = "511101";
                    break;
                case "宜宾":
                    Code = "512501";
                    break;
                case "广元":
                    Code = "510801";
                    break;
                case "达州":
                    Code = "513021";
                    break;
                case "资阳":
                    Code = "513401";
                    break;
                case "攀枝花":
                    Code = "510401";
                    break;
                case "阿坝":
                    Code = "510402";
                    break;
                case "甘孜":
                    Code = "510403";
                    break;
                case "凉山":
                    Code = "510404";
                    break;
                case "广安":
                    Code = "510405";
                    break;
                case "巴中":
                    Code = "510406";
                    break;
                case "黔江":
                    Code = "500239";
                    break;
                case "贵阳":
                    Code = "520101";
                    break;
                case "六盘水":
                    Code = "520200";
                    break;
                case "铜仁":
                    Code = "522201";
                    break;
                case "安顺":
                    Code = "522501";
                    break;
                case "凯里":
                    Code = "522601";
                    break;
                case "都匀":
                    Code = "522701";
                    break;
                case "兴义":
                    Code = "522301";
                    break;
                case "毕节":
                    Code = "522421";
                    break;
                case "遵义":
                    Code = "522101";
                    break;
                case "昆明":
                    Code = "530101";
                    break;
                case "德宏":
                    Code = "530201";
                    break;
                case "曲靖":
                    Code = "532201";
                    break;
                case "楚雄":
                    Code = "532301";
                    break;
                case "玉溪":
                    Code = "532401";
                    break;
                case "红河":
                    Code = "532501";
                    break;
                case "文山":
                    Code = "532621";
                    break;
                case "思茅":
                    Code = "532721";
                    break;
                case "昭通":
                    Code = "532101";
                    break;
                case "西双版纳":
                    Code = "532821";
                    break;
                case "大理":
                    Code = "532901";
                    break;
                case "保山":
                    Code = "533001";
                    break;
                case "怒江":
                    Code = "533121";
                    break;
                case "丽江":
                    Code = "533221";
                    break;
                case "迪庆":
                    Code = "533321";
                    break;
                case "临沧":
                    Code = "533521";
                    break;
                case "拉萨":
                    Code = "540101";
                    break;
                case "昌都":
                    Code = "542121";
                    break;
                case "山南":
                    Code = "542221";
                    break;
                case "日喀则":
                    Code = "542301";
                    break;
                case "那曲":
                    Code = "542421";
                    break;
                case "阿里":
                    Code = "542523";
                    break;
                case "林芝":
                    Code = "542621";
                    break;
                case "西安":
                    Code = "610101";
                    break;
                case "铜川":
                    Code = "610201";
                    break;
                case "宝鸡":
                    Code = "610301";
                    break;
                case "咸阳":
                    Code = "610401";
                    break;
                case "渭南":
                    Code = "612101";
                    break;
                case "汉中":
                    Code = "612301";
                    break;
                case "安康":
                    Code = "612401";
                    break;
                case "商洛":
                    Code = "612501";
                    break;
                case "延安":
                    Code = "612601";
                    break;
                case "榆林":
                    Code = "612701";
                    break;
                case "兰州":
                    Code = "620101";
                    break;
                case "白银":
                    Code = "620401";
                    break;
                case "金昌":
                    Code = "620301";
                    break;
                case "天水":
                    Code = "620501";
                    break;
                case "张掖":
                    Code = "622201";
                    break;
                case "武威":
                    Code = "622301";
                    break;
                case "定西":
                    Code = "622421";
                    break;
                case "平凉":
                    Code = "622701";
                    break;
                case "临夏":
                    Code = "622901";
                    break;
                case "嘉峪关":
                    Code = "620201";
                    break;
                case "酒泉":
                    Code = "622102";
                    break;
                case "西宁":
                    Code = "630100";
                    break;
                case "果洛":
                    Code = "632121";
                    break;
                case "海西":
                    Code = "632221";
                    break;
                case "格尔木":
                    Code = "632321";
                    break;
                case "海东":
                    Code = "632521";
                    break;
                case "海北":
                    Code = "632621";
                    break;
                case "玉树":
                    Code = "632721";
                    break;
                case "黄南":
                    Code = "632802";
                    break;
                case "银川":
                    Code = "640101";
                    break;
                case "石嘴山":
                    Code = "640201";
                    break;
                case "吴忠":
                    Code = "642101";
                    break;
                case "固原":
                    Code = "642221";
                    break;
                case "乌鲁木齐":
                    Code = "650101";
                    break;
                case "克拉玛依":
                    Code = "650201";
                    break;
                case "吐鲁番":
                    Code = "652101";
                    break;
                case "哈密":
                    Code = "652201";
                    break;
                case "昌吉":
                    Code = "652301";
                    break;
                case "博乐":
                    Code = "652701";
                    break;
                case "库尔勒":
                    Code = "652801";
                    break;
                case "阿克苏":
                    Code = "652901";
                    break;
                case "克州":
                    Code = "653001";
                    break;
                case "喀什":
                    Code = "653101";
                    break;
                case "伊犁":
                    Code = "654101";
                    break;
                case "石河子":
                    Code = "655001";
                    break;
                case "塔城":
                    Code = "655002";
                    break;
                case "阿勒泰":
                    Code = "655003";
                    break;
                case "台北":
                    Code = "710001";
                    break;
                case "辽阳":
                    Code = "211001";
                    break;
                case "和田":
                    Code = "653201";
                    break;
                case "澳门":
                    Code = "820000";
                    break;
                case "香港":
                    Code = "810000";
                    break;
                    
                default:
                    break;
            }
            return Code;
        }
    }
}

 

3.获取三天以内的天气，以指定格式输出。

核心代码如下：

Code
public static ArrayList GetThreeDayWeather(string City)
        {
            ArrayList al = new ArrayList();
            /*
           [0] "今天 北京"              string
           [1] "2009-04-17，星期五"     string
           [2] "晴转多云"               string
           [3] "12℃"                   string
           [4] "25℃"                   string
           [5] "2-3级"                  string
           [6] "明天 北京"              string
           [7] "2009-04-18，星期六"     string
           [8] "阴转阵雨"               string
           [9] "11℃"                   string
           [10] "21℃"                  string
           [11] "2-3级"                 string
           [12] "后天 北京"             string
           [13] "2009-04-19，星期日"    string
           [14] "多云转阵雨"            string
           [15] "9℃"                   string
           [16] "20℃"                  string
           [17] "2-3级"                 string         
           */
            string Html = "";       //返回来的网页的源码
            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = string.Format("city=" + City);
            byte[] data = encoding.GetBytes(postData);

            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://php.weather.sina.com.cn/search.php?city=" + System.Web.HttpContext.Current.Server.UrlEncode(City) + "&f=1&dpc=1");
                request.Method = "Get";
                request.ContentType = "application/x-www-form-urlencoded ";
                WebResponse response = request.GetResponse();
                Stream s = response.GetResponseStream();
                StreamReader sr = new StreamReader(s, System.Text.Encoding.GetEncoding("GB2312"));
                Html = sr.ReadToEnd();
                s.Close();
                sr.Close();
            }
            catch (Exception err)
            {
                throw new Exception("访问地址出错~~~ ");
            }

            //去除多余代码，便于分析跟提高效率
            int count = Html.Length;
            int starIndex = Html.IndexOf("<div id=\"Weather3DBlk\">", 0, count);
            int endIndex = Html.IndexOf("<div id=\"SideBar\">", 0);
            Html = Html.Substring(starIndex, endIndex - starIndex);

            try
            {
                #region 得到今天的天气

                //得到今天的标识跟城市
                int firstDayAndCityStartIndex = Html.IndexOf("<h3>", 0);
                int firstDayAndCityEndIndex = Html.IndexOf("</h3>", 0);
                string FirstDayAndCity = Html.Substring(firstDayAndCityStartIndex + 4, firstDayAndCityEndIndex - firstDayAndCityStartIndex - 4);

                //得到今天的日期跟星期
                int firstDateStartIndex = Html.IndexOf("<p>", firstDayAndCityEndIndex);
                int firstDateEndIndex = Html.IndexOf("</p>", firstDayAndCityEndIndex);
                string FirstDate = Html.Substring(firstDateStartIndex + 3, firstDateEndIndex - firstDateStartIndex - 3).Replace("&nbsp;", "，");

                //得到今天的天气
                int firstWeatherStartIndex = Html.IndexOf("<div class=\"Weather_TP\">", firstDateEndIndex);
                int firstWeatherEndIndex = Html.IndexOf(" ", firstWeatherStartIndex + 24);
                string FirstWeather = Html.Substring(firstWeatherStartIndex + 24, firstWeatherEndIndex - firstWeatherStartIndex - 24);

                //得到今天的温度

                int firstTemperatureStartIndex = firstWeatherEndIndex + 1;
                int firstTemperatureEndIndex = Html.IndexOf("</div>", firstTemperatureStartIndex);
                string FirstTemperature = Html.Substring(firstTemperatureStartIndex, firstTemperatureEndIndex - firstTemperatureStartIndex);
                int int1 = FirstTemperature.IndexOf("℃", 0);
                int int2 = FirstTemperature.IndexOf("～", 0);
                int int3 = FirstTemperature.IndexOf("℃", int2);
                string FirstMinTemperature = FirstTemperature.Substring(int2 + 1, int3 - int2);
                string FirstMaxTemperature = FirstTemperature.Substring(0, int2 - int1 + 2);

                //得到今天的风力
                int firstWindforceStartIndex = Html.IndexOf("风力：", firstTemperatureEndIndex);
                int firstWindforceEndIndex = Html.IndexOf("</div>", firstWindforceStartIndex);
                string FirstWindforce = Html.Substring(firstWindforceStartIndex + 3, firstWindforceEndIndex - firstWindforceStartIndex - 3);

                if (FirstWindforce.Contains("至"))
                {

                }
                else if (FirstWindforce.Contains("<"))                  //判断风力是否含有"<"或"≤"字样将,如果有的话，将其替换为2-
                {
                    string strWindforce = FirstWindforce.Substring(1, FirstWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    FirstWindforce = FirstWindforce.Replace("<", minWindforce.ToString() + "-");
                }
                else if (FirstWindforce.Contains("≤"))
                {
                    string strWindforce = FirstWindforce.Substring(1, FirstWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    FirstWindforce = FirstWindforce.Replace("≤", minWindforce.ToString() + "-");
                }

                #endregion

                #region 得到明天的天气

                //得到明天的标识跟城市
                int secondDayAndCityStartIndex = Html.IndexOf("<h3>", firstWindforceEndIndex);
                int secondDayAndCityEndIndex = Html.IndexOf("</h3>", secondDayAndCityStartIndex);
                string secondDayAndCity = Html.Substring(secondDayAndCityStartIndex + 4, secondDayAndCityEndIndex - secondDayAndCityStartIndex - 4);

                //得到明天的日期跟星期
                int secondDateStartIndex = Html.IndexOf("<p>", secondDayAndCityEndIndex);
                int secondDateEndIndex = Html.IndexOf("</p>", secondDateStartIndex);
                string SecondDate = Html.Substring(secondDateStartIndex + 3, secondDateEndIndex - secondDateStartIndex - 3).Replace("&nbsp;", "，");

                //得到明天的天气
                int secondWeatherStartIndex = Html.IndexOf("<div class=\"Weather_TP\">", secondDateEndIndex);
                int secondWeatherEndIndex = Html.IndexOf(" ", secondWeatherStartIndex + 24);
                string SecondWeather = Html.Substring(secondWeatherStartIndex + 24, secondWeatherEndIndex - secondWeatherStartIndex - 24);

                //得到明天的温度

                int secondTemperatureStartIndex = secondWeatherEndIndex + 1;
                int secondTemperatureEndIndex = Html.IndexOf("</div>", secondTemperatureStartIndex);
                string SecondTemperature = Html.Substring(secondTemperatureStartIndex, secondTemperatureEndIndex - secondTemperatureStartIndex);
                int int4 = SecondTemperature.IndexOf("℃", 0);
                int int5 = SecondTemperature.IndexOf("～", 0);
                int int6 = SecondTemperature.IndexOf("℃", int2);
                string SecondMinTemperature = SecondTemperature.Substring(int5 + 1, int6 - int5);
                string SecondMaxTemperature = SecondTemperature.Substring(0, int5 - int4 + 2);

                //得到明天的风力
                int secondWindforceStartIndex = Html.IndexOf("风力：", secondTemperatureEndIndex);
                int secondWindforceEndIndex = Html.IndexOf("</div>", secondWindforceStartIndex);
                string SecondWindforce = Html.Substring(secondWindforceStartIndex + 3, secondWindforceEndIndex - secondWindforceStartIndex - 3);

                if (SecondWindforce.Contains("至"))
                {

                }
                else if (SecondWindforce.Contains("<"))                  //判断风力是否含有"<"或"≤"字样将,如果有的话，将其替换为2-
                {
                    string strWindforce = SecondWindforce.Substring(1, FirstWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    SecondWindforce = SecondWindforce.Replace("<", minWindforce.ToString() + "-");
                }
                else if (SecondWindforce.Contains("≤"))
                {
                    string strWindforce = SecondWindforce.Substring(1, SecondWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    SecondWindforce = SecondWindforce.Replace("≤", minWindforce.ToString() + "-");
                }

                #endregion

                #region 得到后天的天气

                //得到后天的标识跟城市
                int thirdDayAndCityStartIndex = Html.IndexOf("<h3>", secondWindforceEndIndex);
                int thirdDayAndCityEndIndex = Html.IndexOf("</h3>", thirdDayAndCityStartIndex);
                string thirdDayAndCity = Html.Substring(thirdDayAndCityStartIndex + 4, thirdDayAndCityEndIndex - thirdDayAndCityStartIndex - 4);

                //得到后天的日期跟星期
                int thirdDateStartIndex = Html.IndexOf("<p>", thirdDayAndCityEndIndex);
                int thirdDateEndIndex = Html.IndexOf("</p>", thirdDateStartIndex);
                string ThirdDate = Html.Substring(thirdDateStartIndex + 3, thirdDateEndIndex - thirdDateStartIndex - 3).Replace("&nbsp;", "，");

                //得到后天的天气
                int thirdWeatherStartIndex = Html.IndexOf("<div class=\"Weather_TP\">", thirdDateEndIndex);
                int thirdWeatherEndIndex = Html.IndexOf(" ", thirdWeatherStartIndex + 24);
                string ThirdWeather = Html.Substring(thirdWeatherStartIndex + 24, thirdWeatherEndIndex - thirdWeatherStartIndex - 24);

                //得到后天的温度

                int thirdTemperatureStartIndex = thirdWeatherEndIndex + 1;
                int thirdTemperatureEndIndex = Html.IndexOf("</div>", thirdTemperatureStartIndex);
                string ThirdTemperature = Html.Substring(thirdTemperatureStartIndex, thirdTemperatureEndIndex - thirdTemperatureStartIndex);
                int int7 = ThirdTemperature.IndexOf("℃", 0);
                int int8 = ThirdTemperature.IndexOf("～", 0);
                int int9 = ThirdTemperature.IndexOf("℃", int2);
                string ThirdMinTemperature = ThirdTemperature.Substring(int8 + 1, int9 - int8);
                string ThirdMaxTemperature = ThirdTemperature.Substring(0, int8 - int7 + 2);

                //得到后天的风力
                int thirdWindforceStartIndex = Html.IndexOf("风力：", thirdTemperatureEndIndex);
                int thirdWindforceEndIndex = Html.IndexOf("</div>", thirdWindforceStartIndex);
                string ThirdWindforce = Html.Substring(thirdWindforceStartIndex + 3, thirdWindforceEndIndex - thirdWindforceStartIndex - 3);

                if (ThirdWindforce.Contains("至"))
                {

                }
                else if (ThirdWindforce.Contains("<"))                  //判断风力是否含有"<"或"≤"字样将,如果有的话，将其替换为2-
                {
                    string strWindforce = ThirdWindforce.Substring(1, ThirdWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    ThirdWindforce = ThirdWindforce.Replace("<", minWindforce.ToString() + "-");
                }
                else if (ThirdWindforce.Contains("≤"))
                {
                    string strWindforce = ThirdWindforce.Substring(1, ThirdWindforce.Length - 2);
                    int minWindforce = Int32.Parse(strWindforce) - 1;
                    ThirdWindforce = ThirdWindforce.Replace("≤", minWindforce.ToString() + "-");
                }

                #endregion


                al.Add(FirstDayAndCity);
                al.Add(FirstDate);
                al.Add(FirstWeather);
                al.Add(FirstMinTemperature);
                al.Add(FirstMaxTemperature);
                al.Add(FirstWindforce);

                al.Add(secondDayAndCity);
                al.Add(SecondDate);
                al.Add(SecondWeather);
                al.Add(SecondMinTemperature);
                al.Add(SecondMaxTemperature);
                al.Add(SecondWindforce);

                al.Add(thirdDayAndCity);
                al.Add(ThirdDate);
                al.Add(ThirdWeather);
                al.Add(ThirdMinTemperature);
                al.Add(ThirdMaxTemperature);
                al.Add(ThirdWindforce);
            }
            catch (Exception err)
            {

            }

            return al;
        } 
 
    特殊说明，使用第三种方法获取天气预报，输入城市的时候可能会受新浪提供的服务的影响，可能有些城市搜不到，前两种方法应该是不会受影响的。另外，由于代码写的比较急，所以难免代码的质量就会有些问题，还请大家多多包涵。单纯从代码上看，可能确实没有什么难度，可是如果在您的工作中如果因为我的代码为您节省了一些时间，笔者深感欣慰了。 
    另外，由于我的开发环境是vs2008+sp1，如果您的vs版本较低，不妨把项目文件删除掉，然后打开您的vs，选择打开网站，然后定位到本程序的目录，这样就可以进行代码的编译跟踪调试了。 
    再补充一点，有人可能对代码中出现的：System.Environment.NewLine 这句代码比较迷糊，因为这个是.net提供的简单的换行方法，我推荐大家以后能够使用这种.net提供给大家的高效、简便的方法。最关键的是它不容易出错。

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