根据城市查询天气状况

天气查询接口演示代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Net;
using System.IO;
using System.IO.Compression;
using System.Text.RegularExpressions;
using System.Web.Script.Serialization;
namespace tianqi
{
    class Program
    {
        static void Main(string[] args)
        {
            string key = "*********************";//申请的key值
            string cityname = "北京";//输入想要查询的城市名
            string url = "http://apis.haoservice.com/weather?cityname=" +cityname + "&key=" + key;
            WebClient wc = new WebClient();
            wc.Encoding = Encoding.UTF8;
            string str = wc.DownloadString(url);
            Console.WriteLine(str);
            Console.ReadKey();
        }
    }
}

天气查询接口返回示例代码:
天气查询接口:http://www.haoservice.com/docs/6
支持格式: json
http请求方式：GET POST
返回示例:
{
    "resultcode": "200",
    "reason": "查询成功!",
    "result": {
        "sk": { /*当前实况天气*/
            "temp": "21", /*当前温度*/
            "wind_direction": "西风", /*当前风向*/
            "wind_strength": "2级", /*当前风力*/
            "humidity": "4%", /*当前湿度*/
            "time": "14:25" /*更新时间*/
        },
        "today": {
            "city": "天津",
            "date_y": "2014年03月21日",
            "week": "星期五",
            "temperature": "8℃~20℃", /*今日温度*/
            "weather": "晴转霾", /*今日天气*/
            "weather_id": { /*天气唯一标识*/
                "fa": "00", /*天气标识00：晴*/
                "fb": "53" /*天气标识53：霾 如果fa不等于fb，说明是组合天气*/
            },
            "wind": "西南风微风",
            "dressing_index": "较冷", /*穿衣指数*/
            "dressing_advice": "建议着大衣、呢外套加毛衣、卫衣等服装。", /*穿衣建议*/
            "uv_index": "中等", /*紫外线强度*/
            "comfort_index": "",/*舒适度指数*/
            "wash_index": "较适宜", /*洗车指数*/
            "travel_index": "适宜", /*旅游指数*/
            "exercise_index": "较适宜", /*晨练指数*/
            "drying_index": ""/*干燥指数*/
        },
        "future": { /*未来几天天气*/
            "day_20140321": {
                "temperature": "8℃~20℃",
                "weather": "晴转霾",
                "weather_id": {
                    "fa": "00",
                    "fb": "53"
                },
                "wind": "西南风微风",
                "week": "星期五",
                "date": "20140321"
            },
            "day_20140322": {
                "temperature": "9℃~21℃",
                "weather": "霾转多云",
                "weather_id": {
                    "fa": "53",
                    "fb": "01"
                },
                "wind": "东北风微风转东南风微风",
                "week": "星期六",
                "date": "20140322"
            },
       .......
            "day_20140327": {
                "temperature": "11℃~20℃",
                "weather": "阴转多云",
                "weather_id": {
                    "fa": "02",
                    "fb": "01"
                },
                "wind": "南风微风转无持续风向微风",
                "week": "星期四",
                "date": "20140327"
            }
        }
    }
}