如何使用yahoo Yql查询使用woeid号收集天气信息

Question

我有一个文本框，我希望用户在其中输入他们的 woeid 号码，但我不确定如何将其添加到查询字符串中，在下面的代码中我可以获得洛杉矶的天气，但我想要的是现在是通过用户提供的woeid号码获取。

        try
        {

            String query = String.Format("https://query.yahooapis.com/v1/public/yql?q=select * from weather.forecast where woeid in (select woeid from geo.places(1) where text='Los Angeles')&format=xml&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys");
            var wData = new XmlDocument();
            wData.Load(query);

            var man = new XmlNamespaceManager(wData.NameTable);
            man.AddNamespace("yweather", "http://xml.weather.yahoo.com/ns/rss/1.0");

            XmlNode channel = wData.SelectSingleNode("query").SelectSingleNode("results").SelectSingleNode("channel");
            XmlNodeList nodes = wData.SelectNodes("query/results/channel");

            MainForm.WindSpeed = channel.SelectSingleNode("yweather:wind", man).Attributes["speed"].Value;

            MainForm.Town = channel.SelectSingleNode("yweather:location", man).Attributes["city"].Value;

            MainForm.Temperature = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", man).Attributes["temp"].Value;

            MainForm.Condition = channel.SelectSingleNode("item").SelectSingleNode("yweather:condition", man).Attributes["text"].Value;

            MainForm.Humidity = channel.SelectSingleNode("yweather:atmosphere", man).Attributes["humidity"].Value;

            MainForm.TFCond = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", man).Attributes["text"].Value;

            MainForm.TFHigh = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", man).Attributes["high"].Value;

            MainForm.TFLow = channel.SelectSingleNode("item").SelectSingleNode("yweather:forecast", man).Attributes["low"].Value;              
        }
        catch {}
    }

Answer 1

尝试 xml linq :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;

namespace ConsoleApplication1
{
    class Program
    {

        static void Main(string[] args)
        {            
            string city = "Los Angeles";
            string query = String.Format("https://query.yahooapis.com/v1/public/yql?q=select * from weather.forecast where woeid in (select woeid from geo.places(1) where text='{0}')&format=xml&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", city);

            XDocument wData = XDocument.Load(query);
            XNamespace ns = wData.Root.GetDefaultNamespace();

            XElement xWind = wData.Descendants().Where(x => x.Name.LocalName == "wind").FirstOrDefault();
            int speed = (int)xWind.Attribute("speed");
            XElement xLocation = wData.Descendants().Where(x => x.Name.LocalName == "location").FirstOrDefault();
            string town = (string)xLocation.Attribute("city");

            XElement xCondition = wData.Descendants().Where(x => x.Name.LocalName == "condition").FirstOrDefault();
            int temp = (int)xCondition.Attribute("temp");

            XElement xAtmosphere = wData.Descendants().Where(x => x.Name.LocalName == "atmosphere").FirstOrDefault();
            int humidity = (int)xAtmosphere.Attribute("humidity");

            List<XElement> xForecast = wData.Descendants().Where(x => x.Name.LocalName == "forecast").ToList(); ;
            string tfCond = (string)xForecast.FirstOrDefault().Attribute("text");
            int high = (int)xForecast.FirstOrDefault().Attribute("high");
            int low = (int)xForecast.FirstOrDefault().Attribute("low");


       }


    }


}

Answer 2

添加行

var woeid = Request.QueryString["woeid"];

然后像这样将其包含在您现有的查询中：

String query = String.Format("https://query.yahooapis.com/v1/public/yql?q=select * from weather.forecast where woeid = '{0}'&format=xml&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", woeid);

Answer 3

我喜欢下面的解决方案，它处理同名的多个城市

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Threading;

namespace WindowsFormsApplication23
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            string[] cities = { "Los Angeles", "New York", "Salem", "Portland", "Washington" };
            DataTable dt = GetWeather(cities);
            dataGridView1.DataSource = dt;
        }

        DataTable GetWeather(string[] cities)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("City", typeof(string));
            dt.Columns.Add("Region", typeof(string));
            dt.Columns.Add("Humidity", typeof(int));
            dt.Columns.Add("Wind Speed", typeof(int));
            dt.Columns.Add("Temperature", typeof(int));
            dt.Columns.Add("Condition", typeof(string));
            dt.Columns.Add("High Temperature", typeof(int));
            dt.Columns.Add("Low Temperature", typeof(int));

            foreach (string inputCity in cities)
            {
                String query = String.Format("https://query.yahooapis.com/v1/public/yql?q=select * from weather.forecast where woeid in (select woeid from geo.places(100) where text='{0}')&format=xml&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys", inputCity);
                XDocument wData = XDocument.Load(query);
                XNamespace ns = wData.Root.GetDefaultNamespace();
                //System.Threading.Thread.Sleep(10000);
                foreach (XElement channel in wData.Descendants().Where(x => x.Name.LocalName == "channel"))
                {
                    string city = "";
                    string region = "";
                    int? humidity = null;
                    int? speed = null;
                    int? temp = null;
                    string tfCond = "";
                    int? high = null;
                    int? low = null;

                     XNamespace yWeatherNs = channel.Elements().First().GetNamespaceOfPrefix("yweather");

                    XElement xLocation = channel.Element(yWeatherNs + "location");
                    if (xLocation == null)
                    {
                        continue;
                    }
                    else
                    {
                        city = (string)xLocation.Attribute("city");
                        region = (string)xLocation.Attribute("region");
                    }

                    XElement xAtmosphere = channel.Element(yWeatherNs + "atmosphere");
                    if (xAtmosphere != null)
                    {
                        humidity = (int)xAtmosphere.Attribute("humidity");
                    }

                    XElement xWind = channel.Element(yWeatherNs + "wind");
                    if (xWind != null)
                    {
                        speed = (int)xWind.Attribute("speed");
                    }

                    XElement item = channel.Element("item");
                    if (item != null)
                    {

                        XElement xCondition = item.Element(yWeatherNs + "condition");
                        if (xCondition != null)
                        {
                            temp = (int)xCondition.Attribute("temp");
                        }


                        List<XElement> xForecast = item.Elements(yWeatherNs + "forecast").ToList(); ;
                        if (xForecast != null)
                        {
                            tfCond = (string)xForecast.FirstOrDefault().Attribute("text");
                            high = (int)xForecast.FirstOrDefault().Attribute("high");
                            low = (int)xForecast.FirstOrDefault().Attribute("low");
                        }
                    }

                    dt.Rows.Add(new object[] { city, region, humidity, speed, temp, tfCond, high, low });
                }                
            }
            dt = dt.AsEnumerable().OrderBy(x => x.Field<string>("City")).ThenBy(x => x.Field<string>("Region")).CopyToDataTable();
            return dt;
        }
    }
}

如何使用yahoo Yql查询使用woeid号收集天气信息

How to use yahoo Yql query to gather weather information using woeid number

c#

xml

yql

yahoo-weather-api

yahoo-api