I wrote an article sometime back on The CodeProject that dealt with Geolocation. I wrote this back in 2005 so I figured I would update my post here and add a new twist.
The new code still uses YAHOO’s web services, however this time I am writing it in LINQ and C#. So lets dive right in shall we? This is a simple console based program, you can re do it as a webapp or a forms program, but the concept is the same.
using System;
using System.Linq;
using System.Xml.Linq;
namespace YahooWeather
{
class Program
{
public string appid { get; set; }
public Program(string appid)
{
this.appid = appid;
}
}
}
It starts off as any program does with a basic namespace deceleration, as you can see there is one property called appid that gets set when you create an instence of this class.
public string GetWoeid(string Zipcode)
{
string query = String.Format("http://where.yahooapis.com/v1/places.q('{0}')?appid={1}", Zipcode, this.appid);
XDocument thisDoc = XDocument.Load(query);
XNamespace ns = "http://where.yahooapis.com/v1/schema.rng";
return (from i in thisDoc.Descendants(ns + "place") select i.Element(ns + "woeid").Value).First();
}
This function loads up http://where.yahooapis.com/v1/ and grabs the XML stream with LINQ then returns the woeid. The woeid is a unique number that identifies your location
Next, we have to get the weather RSS feed from Yahoo using your woeid
public void GetWeather(string Zipcode)
{
string query = String.Format("http://weather.yahooapis.com/forecastrss?w={0}", GetWoeid(Zipcode));
XDocument thisDoc = XDocument.Load(query);
XNamespace ns = "http://xml.weather.yahoo.com/ns/rss/1.0";
var results = (from i in thisDoc.Descendants(ns + "forecast") select i);
foreach (var thisResult in results)
Console.WriteLine("{0}, it will be {1} with a low of {2} and a high of {3}", thisResult.Attribute("date").Value, thisResult.Attribute("text").Value, thisResult.Attribute("low").Value, thisResult.Attribute("high").Value);
}
This function prints out the current weather conditions. In the same way we got the woeid (parsing xml/rss), we are getting the weather results. All thats left now is the main procedure.
static void Main(string[] args)
{
Program thisYahoo = new Program("<strong>YOUR KEY HERE</strong>");
Console.Write("Enter your zip code please: ");
thisYahoo.GetWeather(Console.ReadLine());
Console.Write("Press Enter...");
Console.ReadLine();
}
View the Yahoo GeoPlanet API documentation |
View the Yahoo Weather API documentation |
Get a Yahoo application ID
Weather.zip (736 bytes, 342 hits)
