[整]C#获取天气预报信息(baidu api)包括pm2.5

 /// <summary>
         /// 获取天气预报信息
         /// </summary>
         /// <returns></returns>
         public BaiduTQ GetWeather()
         {
             // GetCity()获得的信息解析后，填充丰台部分
             string url = @"http://api.map.baidu.com/telematics/v3/weather?location=丰台&output=json&ak=hXWAgbsCC9UTkBO5V5Qg1WZ9";

             HttpWebRequest webRequest = HttpWebRequest.Create(url) as HttpWebRequest;
             webRequest.Method = "GET";
             webRequest.ContentType = "text/html";

             using(StreamReader sr = new StreamReader(webRequest.GetResponse().GetResponseStream()))
             {
                string str =  sr.ReadToEnd();
                BaiduTQ b = JsonConvert.DeserializeObject<BaiduTQ>(str);

                return b;
             }
         }

获取天气预报信息

 public class BaiduTQ
     {
         public int error { get; set; }
         public string status { get; set; }
         public string date { get; set; }
         public List<BaiduResult> results { get; set; }
     }

     public class BaiduResult
     {
         public string currentCity { get; set; }
         public string pm25 { get; set; }
         public List<BaiduIndex> index { get; set; }
         public List<BaiDuWeaterData> weather_data { get; set; }
     }

     public class BaiduIndex
     {
         public string title { get; set; }
         public string zs { get; set; }
         public string tipt { get; set; }
         public string des { get; set; }
     }

     public class BaiDuWeaterData
     {
         public string date { get; set; }
         public string dayPictureUrl { get; set; }
         public string nightPictureUrl { get; set; }
         public string weather { get; set; }
         public string wind { get; set; }
         public string temperature { get; set; }
     }

BaiduTQ

  /// <summary>
         /// 根据ip获取城市信息
         /// </summary>
         /// <returns>ip所在城市信息</returns>
         private string GetCity()
         {
             IPAddress ip = this.GetIPAddress();
             if (ip == null) return null;

             using (var client = new WebClient())
             {
                 var url = "http://ip.taobao.com/service/getIpInfo.php?ip=" + ip;
                 client.Encoding = Encoding.UTF8;
                 var str = client.DownloadString(url);

                 return str;
             }
         }

根据ip获取所在地

 /// <summary>
         /// 获取本地ip地址
         /// </summary>
         /// <returns></returns>
         private IPAddress GetIPAddress()
         {
             IPAddress[] arrIPAddresses = Dns.GetHostAddresses(Dns.GetHostName());
             foreach (IPAddress ip in arrIPAddresses)
             {
                 if (ip.AddressFamily.Equals(AddressFamily.InterNetwork))
                 {
                     return ip;
                 }
             }

             return null;
         }

获取本地ip

ps：若需要获取外网ip，请参见http://www.cnblogs.com/hehexiaoxia/p/4996624.html

附录：国家气象局提供的天气预报接口及使用说明