using System;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Xml.Linq;

namespace InterfaceTest
{
    class Program
    {
        static void Main(string[] args)
        {
            ReportWeather("北京");
        }

        private static void ReportWeather(string cityName)
        {
            string localContent = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + @"\test.txt";
            try
            {
                string url = "http://flash.weather.com.cn/wmaps/xml/china.xml";
                WebClient MyWebClient = new WebClient();
                Byte[] pageData = MyWebClient.DownloadData(url); 
                string pageHtml = Encoding.UTF8.GetString(pageData);
                //XDocument doc = XDocument.Parse(pageHtml);
                using (StreamWriter sw = new StreamWriter(localContent))
                {
                    sw.WriteLine(pageHtml);
                }
                XDocument doc = XDocument.Parse(pageHtml);
                //XDocument doc = XDocument.Load(localContent);
                var results = from ele in doc.Descendants("city") where ele.Attribute("cityname").Value.Equals(cityName) select ele;
                foreach (var result in results)
                {
                    Console.WriteLine("城市：" + cityName);
                    Console.WriteLine("天气情况：" + result.Attribute("stateDetailed").Value);
                    Console.WriteLine("气温情况（摄氏度）：" + result.Attribute("tem1").Value + "到" + result.Attribute("tem2").Value);
                    Console.WriteLine("风力情况：" + result.Attribute("windState").Value);
                }
                Console.ReadLine();
            }
            catch (WebException webEx)
            {
                Console.WriteLine(webEx.Message.ToString());
            }
        }
    }
}