获取天气数据C#

利用HttpClient的GetAsync方法

---

• 发送http请求并获取数据

class GetJson
    {
        //目标链接
        private string APIStr = "http://t.weather.sojson.com/api/weather/city/101030100";
        public async Task<string> HttpGet()
        {
            //转化为url格式
            Uri APIUri = new Uri(APIStr);
            //存储返回的json数据
            string data = null;
            try
            {
                using (HttpClient httpClient = new HttpClient())
                {
                    //设置访问基址
                    //httpClient.BaseAddress = APIUri;
                    //设置相应时间
                    TimeSpan timeOut = new TimeSpan(0, 0, 30);
                    httpClient.Timeout = timeOut;
                    httpClient.DefaultRequestHeaders.Accept.Clear();
                    //向服务器发送get请求
                    data = await httpClient.GetStringAsync(APIUri);
                }
            }//超时抓取
            catch(ArgumentOutOfRangeException e)
            {
                return e.Message.ToString();
            }
            return data;
        }
    }

• json数据的转化为本地对象
  1. 引入处理json的package:Newtonsoft.Json
  2. 建立包含json相同数据相同的属性类

   //报文结构状态
  public class JsonInfo
  {
      public DateTime time { get; set; }
      public CityInfo cityinfo { get; set; }
      public string date { get; set; }
      public string message { get; set; }
      public string status { get; set; }
      public Data data { get; set; }
  }
  #region 详细数据
  //城市信息
  public class CityInfo
  {
      public string city { get; set; }
      public string cityId { get; set; }
      public string parent { get; set; } 
      public string upadataTime { get; set; }
  }
  //今天信息
  public class Data
  {
      public string shidu { get; set; }
      public string pm25 { get; set; }
      public string pm10 { get; set; }
      public string quality { get; set; }
      public string wendu { get; set; }
      public string ganmao { get; set; }
      public WeatherData yesterday { get; set; }
      public List<WeatherData> forecast { get; set; }
  
  }
  //预测信息
  public class WeatherData
  {
     
      public string date { get; set; }
      public string sunrise { get; set; }
      public string high { get; set; }
      public string low { get; set; }
      //空气污染指数
      public string aqi { get; set; }
      public DateTime ymd { get; set; }
      public string week { get; set; }
      //风向
      public string fx { get; set; }
      //风级
      public string fl { get; set; }
      //天气
      public string type { get; set; }
      //提醒
      public string notice { get; set; }
  }
  #endregion

  3. 转化成对象：

  public class JsonStrDel
  {
     
     public JsonInfo WeatherMessage;
     public void DataDel(string jsonMessage )
     {
         //反序列化
         WeatherMessage=JsonConvert.DeserializeObject<JsonInfo>(jsonMessage);
     }
  }